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null

2003, 22 (S2): 2540-2540 doi:

(638)

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ISSUES OF ROCK MECHANICS AND ENGINEERING GEOLOGY IN WEST CHINA EXPLOITATION

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2003, 22 (S2): 2541-2541 doi:

(639)

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STUDY ON CHARACTERISTICS OF IN-SITU STRESS FIELD IN LAXIWA HYDROPOWER STATION

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2003, 22 (S2): 2544-2544 doi:

(598)

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RELATIONSHIP BETWEEN FRACTAL OF GRAIN SIZE AND MECHANICAL PARAMETERS OF FAULT GOUGE AT LAXIWA HYDROPOWER STATION

null

2003, 22 (S2): 2548-2548 doi:

(746)

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RESEARCH ON REASON OF ROCKMASS DIFFERENCE BETWEEN DALIUSHU AND XIAOGUANYIN DAM SITES ON HEISHAN GORGE OF YELLOW RIVER

null

2003, 22 (S2): 2551-2551 doi:

(701)

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GROUTING TEST AND QUALITY ASSESSMENT OF ROCKMASS FOR DAM SITE OF DALIUSHU WATER PROJECT

null

2003, 22 (S2): 2555-2555 doi:

(707)

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STUDY OF FAULT DATING IN DALIUSHU DAM SITE

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2003, 22 (S2): 2559-2559 doi:

(642)

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PERMEABILITY OF RELAXED ROCKMASS IN DALIUSHU DAM SITE

null

2003, 22 (S2): 2564-2564 doi:

(638)

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INFORMATION INTERPRETATION OF ROCKMASS STRUCTURE BASED ON DIGITAL IMAGE

null

2003, 22 (S2): 2568-2568 doi:

(625)

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RELATION BETWEEN DEVELOPMENT DEGREE OF JOINTS AND DEFORMATION PARAMETERS OF ROCKMASS

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2003, 22 (S2): 2572-2572 doi:

(674)

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DETERMINATION OF SPACING OF STRUCTURAL PLANE IN ROCKMASS STRUCTURE RESEARCH

null

2003, 22 (S2): 2575-2575 doi:

(722)

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PERMEABILITY OF WEAK INTERCALATION WITHIN ROCKMASS UNDER LOWER EARTH STRESS

null

2003, 22 (S2): 2578-2578 doi:

(568)

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SEEPAGE FEATURES OF FISSURE WATER IN ORIGINAL ROCK AND PRACTICAL CASE STUDY

null

2003, 22 (S2): 2582-2582 doi:

(545)

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DYNAMIC EVOLUTION AND MECHANICAL PARAMETERS OF SURROUNDING ROCKS IN JINCHUAN NICKEL MINE

null

2003, 22 (S2): 2588-2588 doi:

(744)

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STUDY ON DEFORMATION AND SUPPORT OF ROADWAYS IN WEAK ROCKMASS IN JINCHUAN NICKEL MINE

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2003, 22 (S2): 2595-2595 doi:

(722)

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LAW OF IN-SITU STRESS IN JINCHUAN DIGGINGS AND RESEARCH ON PREDICTION MODEL BASED ON ARTIFICIAL NEURAL NETWORK

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2003, 22 (S2): 2601-2601 doi:

(573)

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STABILITY RESEARCH OF 1~# DEPOSIT IN JINCHUAN NICKEL MINE

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2003, 22 (S2): 2607-2607 doi:

(631)

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null

2003, 22 (S2): 2615-2615 doi:

(672)

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2003, 22 (S2): 2620-2620 doi:

(696)

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2003, 22 (S2): 2625-2625 doi:

(756)

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2003, 22 (S2): 2633-2633 doi:

(657)

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2003, 22 (S2): 2639-2639 doi:

(672)

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2003, 22 (S2): 2643-2643 doi:

(647)

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2003, 22 (S2): 2647-2647 doi:

(757)

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2003, 22 (S2): 2652-2652 doi:

(765)

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2003, 22 (S2): 2659-2659 doi:

(715)

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2003, 22 (S2): 2664-2664 doi:

(755)

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2003, 22 (S2): 2669-2669 doi:

(721)

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2003, 22 (S2): 2673-2673 doi:

(690)

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2003, 22 (S2): 2677-2677 doi:

(736)

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2003, 22 (S2): 2682-2682 doi:

(617)

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NUMERICAL ANALYSIS ON L-TYPE RETAINING WALL IN PERMAFROST REGIONS

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2003, 22 (S2): 2686-2686 doi:

(778)

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The deformations and stresses of backfill of retaining wall are analyzed by elastoplastic numerical calculation model. The boundaries between backfill and retaining wall，and backfill and floor are simulated by interface elements that reflect interaction of them. The working mechanism of L-type retaining wall in permafrost region are studied and examined in detail，for providing reference for future engineering application.

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INFLUENCE OF FREEZING-THAWING ON SOIL STRUCTURE AND ITS SOIL MECHANICS SIGNIFICANCE

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2003, 22 (S2): 2690-2690 doi:

(594)

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TESTING STUDY ON INFLUENCE OF FREEZING AND THAWING ON DRY DENSITY AND WATER CONTENT OF SOIL

null

2003, 22 (S2): 2695-2695 doi:

(822)

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Sandy clay and sandy loam are the two typical kinds of soils along the Qinghai-Tibet railway. Under an open system environment，the two kinds of soils are tested in repeatedly freezing and thawing circulation experiments. In these experiments，all the soil samples are tested at the different dry density，water content and temperature. The results show that the final dry density is a constant after the repeatedly freezing and thawing. The final dry density of sandy clay is 1.55 g•cm－3，while that of sandy loam 1.78 g•cm－3. It can also be concluded that the final dry density of each soil sample depends on the soil type but not the original dry density. The repeatedly freezing and thawing circulation can change water content of soil. After the circulations，the water content of soil will increase，and the water content at the top part is greater than that at the bottom part due to water migration from bottom to top.

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RELATIONSHIP AMONG ELASTIC MODULUS，TEMPERATURE AND
STRAIN RATE OF FROZEN MEDIUM UNDER
STATIC LOADING

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2003, 22 (S2): 2700-2700 doi:

(796)

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Uniaxial compression tests are performed on saturated frozen sand at various temperatures and strain rates. The elastic modulus is obtained from these tests. The relationship among elastic modulus，temperature and strain rate is discussed，and the formula is presented to predict the elastic modulus based on temperature and strain rate.

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STRENGTH CONTROLLING FORECAST METHOD OF CRITICAL LANDSLIDE ALONG RED-SOFT-MUDSTONE LAYER

null

2003, 22 (S2): 2703-2703 doi:

(744)

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Red-soft-mudstone layer landslides of Jurassic，Cretaceous and Tertiary are widely distributed in north China. The basic characteristics of red-soft-mudstone layer are weak anti-weathering ability，low rock mass strength，and bad engineering geological property. The layer is very sensitive to water，and landslide hazards in the area of red-soft-mudstone is very serious. Geological environmental conditions of the red-mudstone layer landslides are the key factors for forming landslides. Rock mass strength characteristics determine the mechanics and deformation mechanism of landslides. The traits and moving characteristics of red-mudstone layer landslide are varied with different conditions of deformation and failure. Based on the study of rock mass strength in different conditions and shear strength of rock layer surface，the mechanisms of creep deformation and slip plane forming are systemically analyzed. The strength-controlling forecast method of critical landslide along red-soft-mudstone layer is given after statistic analysis on typical examples of red-soft-mudstone layer landslide.

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STUDIES ON DEFORMATION AND FAILURE PROPERTIES OF
ANTI-DIP ROCKMASS SLOPE

null

2003, 22 (S2): 2707-2707 doi:

(760)

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Based on the field investigation，geology analysis and numerical simulation of a large-scale slope in reservoir area on the upstream of Yellow River，the rules of deformation and failure of this kind of slopes are disclosed. The layered rock bends like cantilever under the effect of gravity. When rock mass in back of the slope bends to a certain extent，its root will break off and create a continuous weak surface，and shear creep will occur in the toe of the slope. When the shear stress excesses to the shear strength of the weak surface，the topple-slumping will occur in the shear stress concentration zone of the slope.

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PLASTIC POWER OF TRANSLATIONAL LANDSLIDE

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2003, 22 (S2): 2711-2711 doi:

(658)

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Based on analysis of the total motion and harmonic motions of translational landslides，the evolutional rules of the plastic power of slide bodies are studied，which provide a relatively rigorous theoretical basis to the time-prediction method of landslides based on the plastic power concept.

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ANALYSIS ON RAINFALL INFLUENCE ON SLOPE DEFORMATION
AND FAILURE

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2003, 22 (S2): 2715-2715 doi:

(772)

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Rainfall is the major factor to stimulate landslide. In this paper，the influence of rainfall infiltration on slope soil mass is analyzed. The relationship between deformation and rainfall is analyzed by finite element method. It is suggested that rainfall infiltration should be considered in general analysis method for slope stability and deformation.

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DISCUSSION ON PROBLEMS OF SLOPE DISASTER AND TUNNEL DEFORMATION

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2003, 22 (S2): 2719-2719 doi:

(720)

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Based on investigation and analysis on case histories of tunnel deformation along main railways in mountainous area of China since 1980，the tunnel deformation types，geological structure model and interaction mechanism in slope disaster section are systematically presented. The appropriate control technique is also put forward. The research result can provide reference for controlling such disasters in the future.

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IMPORTANCE OF DYNAMIC INFORMATION ABOUT SLOPE
CONTROL ALONG ROAD

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2003, 22 (S2): 2725-2725 doi:

(724)

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With the rapid development of basic communication construction in China，basic road construction is steadily increasing. The miles of roads increases and the grade of roads goes higher. In order to raise transport speed and efficiency，the line selection and road construction gradually extend from plain area to hilly and mountainous area，and consequently the problem of slope disaster is increasing. Effective control and monitoring measures to ensure safety of slope and reasonable engineering control measures are urgent and difficult technical issues. Combining the whole-process monitoring of several control engineering cases of high slopes along north section of Jingzhu express way and scientific analysis of achievement information，some primary ideas is put forward about dynamic information of slope control.

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APPLICATION OF PRESTRESSED ANCHOR CABLE TO CONTROL ENGINEERING OF HIGH SLOPE DISASTER

null

2003, 22 (S2): 2731-2731 doi:

(727)

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The application of prestressed cable is presented to control engineering of high slope disaster in Baolongyu experimental section and the construction technique and quality control of cable are discussed.

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APPLICATION OF PRESTRESSED ANCHOR CABLE TO CONTROL ENGINEERING OF UNSTABLE ROCKMASSES IN HEQUNXIA EXPERIMENTAL SECTION

null

2003, 22 (S2): 2734-2734 doi:

(686)

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The construction cases are described to control the unstable rockmasses in Hequnxia experimental section，such as drilling hole，installation，grouting，extending，and prestress loss.

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SOME PROBLEMS OF ANCHORING TECHNIQUE IN
CONTROLLING LANDSLIDE

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2003, 22 (S2): 2738-2738 doi:

(749)

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Combining with cable practice and application，the designed tensile force，pre-stress and determination of locking load of anchor cable and shearing resistance of anchor cable at slip surface are discussed.

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DISCUSSION ON CONTROL ENGINEERING OF BACHIMEN LANDSLIDE IN SECTION A3 OF FUNING EXPRESS HIGHWAY

null

2003, 22 (S2): 2741-2741 doi:

(633)

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Bachimen landslide is a large-scale old landslide in the accumulated layer. When the road cut is excavated to 10～15 m depth，the landslide is revival because ground water in the landslide becomes rich and shearing resistance of soil mass is reduced. The application of pressure-dispersion type of cable in Bachimen landslide is presented，and the requirements on the construction technique and quality，progress and investment control are put forward.

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LANDSLIDE CONTROL OF JIANGYOU HIGH SLOPE

null

2003, 22 (S2): 2745-2745 doi:

(637)

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According to given enengineering geology condition，the occurence mechanism of Jiangyou landslide is analysed，and a comprehensive control measure is put forword. The problems existing in the engineering construction are solved by the measure.

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STABILITY-LOSING DISTRUCTION MACHANISM AND STABILITY EVALUATION OF CONSEQUENT ROCK HIGHSLOPE IN CHONGQING WANLIANG EXPQESS HIGHWAY

null

2003, 22 (S2): 2748-2748 doi:

(609)

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The geological conception model is put forward to answer the stability-losing question of the consequent high rock slope in Chongqing Wanliang express highway. The deformation failure mechanism and the control factor of stability-losing failure for consequent rock slope are analysed. At the same time，example analysis of the typical consequent high rock slope is given.

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DISASTER LAW AND STABILIZING MEASURES FOR LANDSLIDES OF LONGYAN IN FUJIAN PROVINCE

null

2003, 22 (S2): 2751-2751 doi:

(728)

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The landslide disaster outline of Longyan highway in Fujian province，China，is presented firstly. The disaster distribution，deformation characteristics，landslide scale，developing tendency，triggering reasons，disaster degree and stabilizing measures are studied. The disaster types，disaster mechanism and the engineering countermeasures are proposed. Meanwhile，the basic principles and methods to prevent and mitigate disasters of highway landslides in this area are proposed to guarantee the highway operation and safety.

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CONSTRUCTION TECHNIQUE AND QUALITY CONTROL OF PRESTREESED CABLES FOR STABILIZING CUTTING
SLOPES OF EXPRESSWAY

null

2003, 22 (S2): 2759-2759 doi:

(859)

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The construction technique and quality control of prestressed cables are briefly presented for stabilizing cutting slopes based on the field cases of Fujian expressway in the mountainous area. Especially，the construction technique and the practical application with prestressed cables of distributed pressure mode are introduced in detail.

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FAILURE MECHANISM AND STABILITY ANALYSIS OF
CUTTING SOIL SLOPES

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2003, 22 (S2): 2765-2765 doi:

(708)

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The slope engineering in Fujian province，China，especially the expressway construction in the mountainous area is introduced. The engineering types of slopes are outlined practically for the survey，design，construction and the uphold of the slope engineering. On the basis of study on the engineering geological models and the relative failure mechanism of similar soil slopes，a series of methods to analyze slope stability are proposed，and the principle and measure of slope reinforcement design are put forward.

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ON SHAOPUSHAN LANDSLIDE DISASTER AND ITS ENGINEERING COUNTER-MEASURES

null

2003, 22 (S2): 2773-2773 doi:

(655)

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Shaopushan landslide disaster along Beijing—Fuzhou expressway is briefly introduced. Researches are made on the occurrence mechanism and deformation characteristics of landslide according to disaster characteristics. The landslide stability and its effect on the expressway under construction are appraised，and the reliability of reinforcement work is evaluated. The principles for preventing and mitigating the landslide disaster of this type are put forward.

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ANALYSIS ON ACCUMULATION STATE OF DEBRIS FLOW

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2003, 22 (S2): 2778-2778 doi:

(734)

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DISCUSSION ON ROCKMASS FAILURE UNDER SEISMIC LOAD

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2003, 22 (S2): 2783-2783 doi:

(692)

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The failure of rockmass under seismic load is an intercrossing problem of multi-discipline，such as rock mechanics，engineering geology，earthquake engineering and seismology. In this paper，the two important dynamic loads，rock blasting and earthquake，are discussed firstly，and then the dynamic stress induced by seismic wave propagation and the strength characteristics of rock mass are compared. It is concluded that the main cause of rock mass failure under seismic load is tensile fracture of rock material and failure of discontinuities. The limit depth of rockmass failure under seismic load is put forward，and the important influences of in-situ stress and topography on types and extent of rockmass failure under seismic load are analysed.

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ANALYSES ON SEISMIC RESPONSES OF GROUND

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2003, 22 (S2): 2789-2789 doi:

(725)

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The changes of earthquake acceleration in bed rock after transiting in horizontal soil layers are calculated by using the method of equivalent linearization. The influence of frozen earth layers and radiant damps of groundwork is considered and back-analysis is performed. The results indicate that the factors of radiant damps of groundwork and changes of seasons should be considered in seismatic design of structure.

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SIMULATION ON NEAR-SOURCE GROUND MOTIONS OF 1988 SUNAN EARTHQUAKE BY STOCHASTIC METHOD

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2003, 22 (S2): 2794-2794 doi:

(673)

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At present，two main stochastic models，point-source model and finite-fault model，are adopted to simulate ground motions. In this article，the stochastic point-source model is adopted to simulate the minor-moderate magnitude Sunan earthquake (ML=4.5，19 December 1988) and the result is reasonable. The stochastic point-source model and finite-fault model are used to simulate near-source strong ground motions for Sunan strong earthquake (Ms=5.7，22 November 1988)，and the results show that the finite-fault effect should be considered in near-source ground motion estimation.

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ESTIMATION ON SEISMIC SAFETY OF NANJING CHANGJIANG SUBMERGED TUNNEL

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2003, 22 (S2): 2800-2800 doi:

(794)

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The earthquake responses of Nanjing Changjiang Submerged Tunnel of highspeed railway are analyzed by using seismic response analysis model of submerged tunnel and the dynamic model of plane finite element. The seismic safety and stability of the tunnel under earthquake loading are estimated.

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SEISMIC SAFETY EVALUATION METHODS FOR GROTTOES

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2003, 22 (S2): 2804-2804 doi:

(651)

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According to the features of grottoes，the principles and basis for seismic design are studied. The seismic safety evaluation method for grottoes is discussed from aspects of seismic load determining，seismic stability and engineering protection measures.

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STABILITY ANALYSIS OF TIANCHI LANDSLIDE-DAM
UNDER EARTHQUAKE

null

2003, 22 (S2): 2809-2809 doi:

(676)

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Analysis is made on the factors affecting the stability of Tianchi landslide-dam under earthquake. The analysis result shows that Tianchi landslide dam is stable and will not exert bad effect on the Jishixia hydropower station under earthquake.

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STABILITY ANALYSIS OF ABUTMENT SLOPE UNDER EARTHQUAKE

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2003, 22 (S2): 2813-2813 doi:

(710)

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CHARACTERISTICS OF ELASTIC WAVE AND ITS APPLICATION TO XIAOGUANYIN DAM SITE ON YELLOW RIVER

null

2003, 22 (S2): 2819-2819 doi:

(707)

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On the basis of elastic wave velocities recorded on the walls of adits and between adits by penetration method，the spatial distribution characteristics of wave velocities of rockmass in Xiaoguanyin dam site on the Yellow River are analyzed. It is shown that elastic wave of this area is related to in-situ stress field whose main component is gravity. The relationship between wave velocity and mechanical parameters of rock mass is established. By the means of elastic wave velocities，the relationship between mechanical parameters and earth stress field is established. By means of these results，it is feasible and easy to obtain or estimate reasonable mechanical parameters that are necessary for evaluation，calculation and analysis in those places where field test is not easy to be carried out.

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STUDY ON STATIC AND DYNAMIC BEHAVIOURS OF RAILWAY ROADBED FILLED WITH FLYASH

null

2003, 22 (S2): 2824-2824 doi:

(648)

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MICRO-ANALYSIS ON SEISMIC SUBSIDENCE
CHARACTERISTICS OF LOESS

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2003, 22 (S2): 2829-2829 doi:

(609)

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Loess is distributed widely in China and the seismic subsidence is one of the major disasters in loess areas. In this study，the subsidence deformation characteristics of loess structure under earthquake loading are organically combined with the microstructure characteristics. By electronic-microscope scanning，the microstructure and grain shape of loess are analyzed，the influence of middle-large pores on loess seismic subsidence is discussed，and the relationships among microstructure，seismic subsidence coefficient and critical dynamic stress of loess are disclosed.
Key words soil mechanics，loess，seismic subsidence，microstructure，overhead pore

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PREDICTION METHOD OF SEISMIC SUBSIDENCE OF LOESS
GROUND WITH SHEAR WAVE VELOCITY

null

2003, 22 (S2): 2834-2834 doi:

(759)

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Based on dynamic test and wave velocity data of loess，the statistic relationship between shear wave velocity and seismic subsidence of loess is established. The prediction method of seismic subsidence of loess ground is proposed. The calculation result of seismic subsidence of loess ground under different seismic intensities，especially that of reversed value from Yongdeng earthquake shows that the value of seismic subsidence with normalized water content has a close relationship with shear velocity and dynamic stress，and the relationship can be used to assess the seismic subsidence of loess ground.

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DYNAMIC CHARACTERISTICS AND SEISMIC RESISTANCE OF LOESS GROUND TREATED WITH DYNAMIC COMPACTION

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2003, 22 (S2): 2840-2840 doi:

(609)

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Loess is water collapsible and vulnerable under earthquake. Through laboratory testing study on the dynamics constitutive model，elastic modulus，damping ratio，seismic subsidence and liquefaction and field test on wave velocity and ground tremor of loess ground treated with dynamic compaction，the effect of dynamic compaction on the seismic resistance of loess ground is evaluated quantitatively. Accordingly，the technical criteria for combinative treatment of loess ground for seismic subsidence and water collapsibility are proposed.

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APPLICATION STUDY OF IMPACT COMPACTION TECHNOLOGY TO IMPROVEMENT OF COLLAPSIBLE LOESS ROADBED

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2003, 22 (S2): 2848-2848 doi:

(653)

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A new technology，impact compaction technology in improving collapsible loess roadbed，is studied. The effects of the improvement are analyzed qualitatively and quantitatively，both in macroscale and microscale， through routine soil tests and microstructure testing methods such as scanning electron microscope and mercury intrusion porosimetry. The improvement mechanism of the technology is discussed and reasonable parameters for roadbed construction process are put forward as to provide theoretical basis as well as practical experience for the promotion of this new technology in the loess regions.

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RELIABILITY ANALYSIS OF TUNNEL LINING STRUCTURE BY RESPONSE SURFACE METHOD

null

2003, 22 (S2): 2853-2853 doi:

(639)

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The statistic characteristic analysis of loading effect is a complex problem for reliability analysis of tunnel lining structure. The specific properties of probability about loading effect on tunnel lining structure are analyzed by FEM response surface method，and the structure reliability index is calculated by fractile method.

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INFLUENCE OF SIDE-PRESSURE COEFFICIENT ON MECHANICAL BEHAVIOUR OF TUNNEL LINING

null

2003, 22 (S2): 2857-2857 doi:

(670)

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COMPARATIVE TESTING STUDY ON STRENGTH BEHAVIOUR OF UNDISTURBED AND REMOLDED FROZEN CLAY

null

2003, 22 (S2): 2861-2861 doi:

(777)

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Comparative testing study is made on uniaxial compressive strength of undisturbed and remolded frozen clay in the same conditions. The test results show that the compressive strength of the undisturbed frozen clay is slightly lower than that of the remolded frozen clay，and the elastic modulus of the former is slightly higher than that of the later. There are significant differences of the failure mode and failure strain between the undisturbed and remolded frozen clay. The undisturbed frozen clay usually takes on typical brittle failure character，and its failure strain is smaller. Whereas，the remolded frozen clay usually takes on typical ductile plastic failure character，and its failure strain is greater. These differences should be taken into account in the design and construction of artificially frozen ground engineerings.

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COMPRESSIVE STRENGTH OF SATURATED FROZEN SILT UNDER CONSTANT STRAIN RATE

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2003, 22 (S2): 2865-2865 doi:

(645)

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Uniaxial compressive strength tests are conducted on the saturated frozen Lanzhou silt (loess) under various constant strain rates and various constant temperatures. From the test results，it is concluded that (a) compressive strength is very sensitive to temperature and increases exponentially as temperature decreases，(b) compressive strength is sensitive to strain rate and increases exponentially as strain rates increase within certain range，(c) compressive strength decreases exponentially as failure time increases，and (d) compressive strength of the saturated frozen silt with higher dry density is higher than that of frozen silt with lower dry density. The increment rate of compressive mainly depends upon strain rate.

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BEHAVIORS OF STRENGTH AND DEFORMATION OF FROZEN SOIL WALL IN ARTIFICIALLY FROZEN SHAFT

null

2003, 22 (S2): 2871-2871 doi:

(607)

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For frozen Lanzhou sandy soil and loess at the K0DCF test mode，it is found that the stress-strain curves are similar to ideal rigid plastic ones under unloading，but the stress-strain curves of sandy soil and loess are different in the sections of K0 consolidation. The yield strength increases linearly with increment of confining pressure and decrement of temperature. The yield strength of frozen loess is obviously larger than that of the frozen sandy soil. The failure strain also increases linearly with confining pressure. With decrement of temperature，for frozen sandy soil，the failure strain decreases，while for frozen loess，the failure strain increases gradually.

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MAIN DISEASES AND THEIR CAUSES OF EARTHEN RUINS IN ARID REGION OF NORTHWESTERN CHINA

null

2003, 22 (S2): 2875-2875 doi:

(615)

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After a lot of site investigations，analyses and tests in the laboratory，it is found that the earthen ruin sites now existing in the arid regions of northwestern China have multi-diseases，which mainly take the forms of the backoff of wall bases，holes or cancellations，scaling off，cracks and collapses. All these diseases mentioned above are caused by wind erosion，rainfall erosion and repeated eutectic salt dissolving. This finding will play an important part in guiding us to protect the earthen sites in the areas concerned.

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ENGINEERING PRACTICE FOR SEEPAGE TREATMENT OF A HAN DYNASTY TOMB BY COMPREHENSIVE METHOD

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2003, 22 (S2): 2881-2881 doi:

(646)

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The cause of coffin chamber seepage in a Han dymasty bomb is analysed，and comprehensive method is adopted to track and determinate the seepage path. Grouting，filling，draining and packing are comprehensively used to solve the seepage problem in engineering practice.

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STRENGTH CHARACTERISTICS OF SAND FIXATED BY SH

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2003, 22 (S2): 2883-2883 doi:

(692)

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SH is a new polymeric material of chemical sand-fixation. It is necessary for this material to be used in modern desert engineering. In this paper，the compressive strength of SH-fixated sand and its characteristics are studied through a great deal of laboratory experimants. The strength may reach 1 MPa if the sample is compacted slightly. The percentage of streagth loss is lower than 25% after 20 times of freezing-thawing. The strength increases 8.9% after being shined for 300 hours of intermission radiation. The sand fixated with SH is not only of high strength，but also shows good resistance to freezing-thawing and aging. SH is an effective material for sand-fixation.

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TESTING STUDY ON LOESS CONSOLIDATED BY LD SERIAL ROCK-SOIL CEMEDIN

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2003, 22 (S2): 2888-2888 doi:

(679)

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Gel，as the product of chemical reaction，can cement soil particles. The characteristics of gel can be used to consolidate soil，which is named as soil chemical consolidation. Chemical consolidation can improve structural state of loess，increase its bearing capacity，and improve its original engineering geological properties，namely settlement by soaking，disintegration and higher compression. In this paper，the consolidation mechanism of LD serial rock-soil cemedin developed by Lanzhou University is introduced. The optimization test of strength，disintegration test and frost-resistance test are conducted on loess consolidated by LD serial rock-soil cemedin to analyze its engineering geological characteristics. The major factors that influence the strength of consolidated loess are also studied. The test results show that loess consolidated by LD serial rock-soil cemedin agent (especially LD-3# and LD-4# rock-soil cemedin) is of better physico-mechanical property and greater frost- resistant ability than pure loess. It can be concluded that LD serial rock-soil cemedin is a kind of ideal cemedin.

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RELIABILITY RESEARCH OF LOESS ON ELIMINATING
COLLAPSIBILITY WITH PRESSED PILES

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2003, 22 (S2): 2894-2894 doi:

(638)

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The composite foundation of lime-soil pressed piles in the collapsible loess area is investigated. The interval，diameter，and length of piles are determined by means of reliability theories. The reliability design method is put forwards for pressed pile.

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CALCULATION AND MONITORING ANALYSIS ON SETTLEMENT OF PILE-RAFT FOUNDATION

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2003, 22 (S2): 2899-2899 doi:

(504)

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Three different methods are introduced to calculate foundation settlement. Then the settlement calculation is made on rammed enlarged bearing pile foundation by using the above methods，and is compared with the values obtained from static loading test on single pile and monitoring on building settlement. It is shown that the calculation value by using the regional regulation is closer to the real settlement value of pile top from static loading test on single pile.

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STUDY ON BEHAVIOR OF BORED PILES WITH GROUTED-BASE ON GRAVEL STRATUM

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2003, 22 (S2): 2903-2903 doi:

(659)

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Slurry drilling method is widely employed in pile construction. Sediments at base and clay slurry along hole shaft cannot be avoided in construction procedure with this method. Engineering practice proves that base sediments and slurry can severely reduce the pile’s bearing capacity and increase the settlement of the bored cast-in–situ piles. Based on the results of the field experiments，the bearing features of cast-in-situ bored piles with grouted toe in gravel bearing stratum are analysed. It is pointed out that the friction of cast-in-situ bored piles (lenth/diameter ratio of 54.1～57.1) with grouted toe in gravel bearing stratum is three times of that of the commom bored piles. The settlement of the bored cast-in-situ piles with grouted toe can be largely decreased. Most of deformation of bored cast-in-situ piles with grouted toe is elastic，and residual deformation is quite small. The experiment results can give some references to pile construction and design.

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TEST AND EVALUATION ON SOFT GROUND STABILIZED
BY CHEMICAL INJECTION CHURNING PILE OR CHEMICAL CHURNING PILE

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2003, 22 (S2): 2908-2908 doi:

(669)

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The geological condition，basic physico-mechanical properties and treating measurements of K35+930～K36+410 section of Yinjiazhuang—Zhongchuan Airport highway are described. The main procedures of field loading test，its technological points and the stability standard are introduced. The research is based on the engineering practice of twenty two chemical injection churning piles，four chemical churning piles，four blocks of ground between chemical churning piles and six blocks of composite ground with three piles in two sections. The test results are analysized and evaluated.

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ESTIMATION ON BEARING CAPACITY OF COMPOSITE FOUNDATION WITH LIME-SOIL PILES

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2003, 22 (S2): 2913-2913 doi:

(654)

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The composite foundation with lime-soil piles，as a kind of economical and reasonable foundation treatment method，is used widely. The bearing capacity of this kind of foundation is estimated according to the working principle of foundation and the basic physical properties of soil. The study result is useful to the design and construction of lime-soil pile.

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TESTING STUDY ON REINFORCED EARTH RETAINING WALL ALONG YANGQUAN-SHEXIAN RAILWAY

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2003, 22 (S2): 2916-2916 doi:

(646)

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Tests are carried out on the reinforced earth retaining wall along both sides of Yangquan-Shexian railway in Shanxi province. Characteristics of the deformation of metope，distributions of earth pressure on the wall and stress of base are analyzed. The research results testify the rationality of the design according to the simplified 0.3 H method，and provide reference for the design and application of reinforced earth retaining wall.

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DISCUSSION ON SUBSIDENCE PROBLEM OF MAN-BORED CAST-IN-PLACE PILE IN HIGH EARTH FILL SECTION WITH HIGH COLLAPSIBILITY

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2003, 22 (S2): 2920-2920 doi:

(675)

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Man-bored cast-in-place pile foundation in collapsible loess area，especially in high earth fill section with high collapsibility，often causes subsidence by some reasons and consequently deformation accident of buildings. Based on typical case histories of man-bored cast-in-place pile foundation subsidence of several buildings in certain zone of Lanzhou，the reason of pile subsidence in this zone is analysed and several treatment measures are discussed.

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STUDY ON ANTI-SEEPAGE TREATMENT OF BAYI RESERVOIR DAM

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2003, 22 (S2): 2925-2925 doi:

(881)

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Compared with bored pile，underground diaphragm wall is an environment friendly way with some advantages，such as low disturbance and high efficiency. Impervious wall of plastic concrete is adopted for its combined action with the earth dam. The construction scheme and technique，used in the anti-seepage treatment of Bayi reservoir dam，are introduced，with a method of dealing with special underground structure inside the dam. Efficiency is improved through adoption of interleaving constructing and optimized scheduling for equipments. Further study on impervious wall of plastic concrete is needed.