Proceeding from the fact that surrounding rock-support system of underground excavation is of two properties，i.e. the properties of geology and mechanics and the properties of system，it is clarified that surrounding rock-support system is an open complex giant system (OCGS). The only feasible and effective way to treat an OCGS up to now is the meta-synthesis from the qualitative to the quantitative point of view，and the scientific semi-analytic method provides a solid theoretical foundation for underground excavation support design.

Based on the whole sub-level caving process with deformation and failure of coal，the activities of top coal and the roof are analyzed by using FLAC software，and the three dimensional stress，deformation and failure are getten clear. The results show that top coal is difficult to be fragmented under the supporting pressure because of the higher strength of coal，and must be weakened to increase recovery rate. There are zoned characteristics for top coal failure. The top coal begins to move in the site of the peak supporting pressure with 5～7m before coal wall.

The concept of chemical damage is given and expounded. The mechanical effects of chemical damage from water and rock interaction are related to many complex processes. The mechanism of the mechanical effects of water-rock interaction on rock is explored by using the theory of chemistry，rock failure mechanics with chemical damage，the modeling method and the energy point of view. Using the theory of large mode and small mode on chemical action of water-rock，the reason why the strenuous deformation and failure of rock mass frequently occurred after torrential rain or human engineering activity in natural world is expounded. The ways of quantitative methods for the chemical damage of water-rock interaction are approached. The division into districts of the chemical damage levels in rock is proposed. The rock failure mechanics with chemical damage is a new analysis method proposed by author. The method may explain and quantitatively analyze the mechanical effects of water and rock interaction.

Based on the theory of irreversible process thermodynamics in partⅠof this paper，non-linear thermodynamic analysis is engaged in，and non-linear stress-strain-temperature equations are established. Thus，general expression for time-temperature equivalent principle is theoretically obtained. And furthermore in part Ⅱ，the equation of displacement factor in time-temperature equivalent principle is derived. At last， the parameters in the equation are determined，and the main curves for creep compliance and cohesive of Three Gorges granite are obtained by a series of tests. As a result，it is proved that both deformation and strength performances obey the principle.

With the consideration of strengthening mechanism of grouting to geomaterials，the proper grouting modeling methods are proposed. The proposed methods can model the deformation properties of grouted geomaterials by variation of sound wave velocities before and after grouting，and the strength properties by properly estimating the strength parameters of rock joints or soft soils. The damage tensors and seepage parameters of grouted jointed rock mass can be obtained by the representative element volume of grouted materials.

The technique of gob-side entry retaining in fully-mechanized coal face with top-coal caving is the key measure with which the Y type ventilation manner can be used to solve the problem of face gas accumulation. According to the given conditions of Changchun Coal Mine，Luan Bureau，the equivalent material simulation testing is made，and the broken situation and shape of main roof，the influence of different support on roof activity are analysed. The study results provide scientific basis for the determination of the support of gob-side entry and the parameters of roadside filling.

The strength of layered rocks possesses anisotropic (or transversely isotropic) characteristics. When Mohr-Coulomb criterion is used to describe the shear failure of this kind of rocks，it should be considered that c， are varied with the layered directions. The empirical expressions of c， for layered rocks are proposed and compared with the test results given by the former researchers. It is found that both of them are agreeable well to each other. Based on the proposed expressions，the influences of the change rule of c， ，the stress state and the inclination of layer loading direction on the shear failure orientation of layered rocks are calculated and analyzed.

The laws of ground surface subsidence and rockmass movement in east area of Chenchao iron mine due to underground mining are studied. The ground surface subsides discontinuously，and rockmass fails slowly in the mine. When the ratio of mining depth to the total mining thickness is above 17，the rockmass movement can’t spread to ground surface. When the ratio of mining depth to the total mining thickness is below 17，the ground surface subsidence is studied respectively according to three cases.

Based on mechanics classification of media，a reliability model for blocky engineering rockmass stability is made by mean of block theory and hemispheric projection. The stability probability of blocky surround rocks in a large underground opening is calculated according to the reliability model. The applying prospects and adaptation of the model are shown by project example.

Using the Monte Carlo method，the normal slope model of grid and bedded rocks can be analyzed. With the random combination of steep and flat series of joints in the J-slope，the failure probability and reliability index can be calculated under the action of water and earthquake. The high slope stability of one copper mine in Jiangxi is analysed by the proposed method，and the result is satisfying.

After systematically analyzing the engineering geological conditions of the high slopes at both the outlets and inlets of the two tunnels of the Panshitou Reservoir，Henan province，a classification of the engineering geological rock groups of the high slopes is made，then the slope failure models are proposed. The rockmass mechanics parameters of the slopes are also discussed. Based on these，stereographic projection method，limit equilibrium method and three-dimensional differential method (FLAC3D 2.00 for Windows) are used for stability evaluation of the slopes.

The Kaiser effect of rock can be employed to measure the in-situ stresses. The stresses corresponding to Kaiser effect of rock will approach and even exceed the uniaxial strength of rock with increment of strata depth. And when this happens，the rock collapses，then it is impossible to use the conventional Kaiser effect to measure the in-situ stresses. So under the above conditions the conventional Kaiser effect of rock becomes ineffective. The in-situ stress measurement using Kaiser effect of rock samples under confining pressures is carried out，in order to offset the unsatisfactory property of the uniaxial Kaiser effect measurement of rock sample stresses. The influence of the confining pressure on the Kaiser effect of rock is systematically studied by applying a group of varied confining pressures to the rock samples with the same depth. And an experimental measuring method of in-situ stresses with Kaiser effect of rock samples under confining pressure is proposed，as well as the experimental principles. The conclusion is that the relationship between the stresses corresponding to Kaiser effect of rock and the confining pressures is linear，and the statistical regression relationship is obtained. The calculated results based on the experiments are in good accordance with the hydro-fracture results.

By using Rock Failure Process Analysis code (RFPA2D)，the slip failure process of rock sample is numerically studied. The rock samples are considered as brittle and heterogeneous materials. The phenomena of progressive failure leading to collapse in sheared rock samples are numerically demonstrated. It is shown that shear face is the main feature of the slip failure mode. The shear face is initiated first in one side of the sample and to the center and then to another side. Finally，a macro shear face mode is observed and there are relationships between failure face fractal and mechanical behavior.

Based on the fracture-damage coupled constitutive model of jointed rock mass，3-D FEM analysis on stability of Xiaowan arch dam abutment is proceeded. The distribution of stress and deformation of abutment and dam is obtained. Furthermore，the preferred reinforcement schemes of abutment are suggested according to the technical and economic feasibility.

High and thin concrete liner on the wall of chambers is connected to rock mass with high strength construct bolt in permanent shiplocks at the Three Gorges Project. During the operation，the maximum tensile load may be up to 600 kN for single bolt. It is a considerable problem whether concrete can bear the load or not，and what the stress state and possible failure will be. Based on the field testing results，the answer is presented for these problems and the working mechanism of full grouting bolt also discussed. It is pointed out that normal dilated deformation would appear on the interface between cohering medium and bolt because of the screw thread. It is of special effect on ensuring and enhancing bond force. Meanwhile，the design theory for grouting bolt and measures for increasing bond force are discussed.

The comparison of results of conventional and high pressure water-pressure tests on the dam foundation rock masses of Xiluodu hydroelectric station is performed in order to determine the change of permeability of rock masses under different stresses. The changes of Lugeon unit and P-Q curve are achieved according to the results of comparison tests.

Based on understanding the reason of ground surface deformations resulting from the construction of shield tunnel，the effects of the shield tail void，the degree of filling grout and the disturbance of soil around the tunnel on the ground deformations are generalized as an equivalent circle zone，and the degree of sensitivity of the surface deformation to its parameters is also discussed. With the measured data，the parameters of equivalent circle zone can be obtained by back analysis of soil displacement. The case study shows that the proposed method is reasonable and satisfying in actual engineering.

With the allowable maximum ground settlement as target value，a dynamic optimization model is designed to draw up the strategy(technical measures) controlling the effect of tunnelling on environment. Through adjusting the project during the stages of design and construction，the model distributes the risk of effect on environment to each step of construction reasonably and keeps the technical measures of each step with clear environmental control object. If there is deviation between practical situation and forecast，the model can adjust the technical measures of the subsequent steps and repeat like this until the construction is over. So the model can effectively control the effect of tunnelling on environment. At the same time the rule of the limitation of target value is also studied.

The overall and systemic studies are given to the basic principle of the Digital Panoramic Borehole Camera System from hardware to software. The key problem of realizing in hardware and restoring in software is solved. The best implement scheme is put forward and the optimization design is carried through，The solid base is established for successful development of this system.

The object-oriented programming method is introduced. By this method，the classes of finite element models are designed and their C++ description and the implementation are given. A geotechnical engineering FEM software based on Window95/98/NT is designed and developed. The common FEM classes are：the class of matrix，element class，node class，Gauss class，shape function class，stress class，load class，distributed force class，the drawing class，mesh class，region class，boundary class，word class，etc. The basic program frame and the codes are given.

Shear failure is the commonest failure，which often takes place in sound，jointed and weak rock foundation. On the basis of inferring shear parameters of rockmasse with Hoek-Brown strength criterion，the Bell solution is introduced to determine ultimate bearing capacity of homogeneous rock foundation under shear failure，and the method validity is analyzed.

The attenuation behaviors and mechanism of high frequency impulse electromagnatic wave during its propagation in heterogeneous subground medium are analyzed. The analysis results are applied to the engineering prospecting of infirm ground and damages caused by mining. The application results indicate that the method for studying the stability of the ground by means of attenuation hehaviors of high frequency impulse electromagnetic wave of GPR is feasible，and has good application foreground in future.

It is necessary to build decision support system(DSS) of the synthetic exploration methods in the engineering geology because choosing methods in this area is highly reliant on the experience of experts. The development and application of database(DB) in the process of developing RGDSS is emphatically introduced. Through the analysis of DSS and DB，the importance of DB for developing DSS is understood，so the decision support-oriented DB of engineering examples for the synthetic geological exploration methods is firstly developed. The practical studies and applications show that it is feasible to develop a decision support system using object-oriented database management system.

Based on the study on reconsolidation properties of saturated soft clay under impact loading before，the problems are furthermore studied，such as the residual deformation，residual pore pressure and reconsolidation characteristics of overconsolidated clay，and the reconsolidation deformation of normally consolidated saturated soft clay under deviated state of stress. The effect of plasticity index of soil on the coefficient of reconsolidation volume compressibility is analyzed. The relationship between residual pore water pressure and residual strain and its mechanism，and the disturbance consolidation problem are also discussed. Besides，the calculation methods of both the settlement and the shear strength of soft clay foundation under deviated stress state are suggested.

The testing study is made on the reinforcement mechanism of soil nailing support for soft clay slope. The testing result is analysed and conclusion is made by using the method of the multi-element coordinate system.

The structural types of alluvial foundation and seepage characteristics of the dike on the foundation are analyzed. Based on a great deal of seepage computation by using FE method，the applicable conditions and optimal design schemes of vertical cutoff wall for different types of dike foundation are studied. Moreover，the rational design standards of cutoff wall are also discussed.

Through simulation test and engineering practice，the reaction law between shape steel and cement-soil is explored and the verification method of the shape steel recovery in SMW construction method is put forward，too.

The characteristics of acoustics and strength of deep cement agitating pile are studied and they depend on the physical and mechanical properties of cement and soil. Some relative formulas are given based on the experiments. The measurement method of stress wave reflection used for quality evaluation on cement pile is discussed after analysis on theoretical feasibility and practical maneuverability.