循环荷载作用下泥炭质土动力累积特性试验研究

doi:10.13722/j.cnki.jrme.2016.1471

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Abstract Peaty soils are generally viewed as“problematic”soils for their high organic matter content，high water contents，low bulk density，high compressibility and low strength characteristics. The long-term accumulative behaviour of peaty soils subjected to traffic loads was studied through a series of cyclic triaxial compression tests on the samples retrieved from the site nearby Caohai on the northern side of Lake Dian. The variables including the confining stress level，the amplitude of dynamic stress and the static deviatoric stress were taken into account in this study. It was found that the tested samples were typical peaty soil，which had the initial water contents of 181.5%–259.3%，the initial densities of 1.10–1.22 g/cm3，the organic contents of 34.7%–44.2%. The organic matters were highly decomposed. Both the amplitude of dynamic stress and static deviatoric stress had the distinct influences on the developments of permanent axial strain and pore water pressure. The larger amplitude of dynamic stress or the static deviatoric stress accelerated the developments of the permanent axial strain and pore water pressure. The development of permanent axial strain was faster when a lower dynamic stress and a larger static deviatoric stress were applied，in contrast to the case that a larger dynamic stress and a lower static stress were applied. The initial confining stress level appeared to have a little effect on the development of permanent axial strain，while it had a significant impact on the accumulation of pore water pressure. In addition， an empirical relation between the accumulative plastic strain and loading cycles was presented based on the relationships between the permanent axial strain rate and loading cycles under dual logarithmic coordinates as well as the previous studies.

Key words： soil mechanics peaty soil organic matter soil dynamics static deviatoric stress long-term cyclic loading

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	Articles by authors
	CHEN Cheng1
	ZHOU Zhengming1
	ZHANG Xianwei1
	YIN Song2
	MU Kun3

Cite this article:

CHEN Cheng1,ZHOU Zhengming1,ZHANG Xianwei1, et al. Experimental study on accumulative behaviour of peaty soil under cyclic loading[J]. , 2017, 36(5): 1247-1255.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.1471 OR http://www.rockmech.org/EN/Y2017/V36/I5/1247

[20]	ASTM D2974-14. Standard test methods for moisture，ash，and organic matter of peat and other organic soils[S]. West Conshohocken，PA，USA：ASTM International，2014.
[11]	TSB. Railway investigation report R99Q0019[R]. [S. l.]：The Transportation Safety Board of Canada，1999.
[16]	黄茂松，李进军，李兴照. 饱和软黏土的不排水循环累积变形特性[J]. 岩土工程学报，2006，28(7)：891-895.(HUANG Maosong，LI Jinjun，LI Xingzhao. Cumulative deformation behaviour of soft clay in cyclic undrained tests[J]. Chinese Journal of Geotechnical Engineering，2006，28(7)：891-895.(in Chinese))
[18]	唐益群，张曦，赵书凯，等. 地铁振动荷载下隧道周围饱和软黏土的孔压发展模型[J]. 土木工程学报，2007，40(4)：82-86.(TANG Yiqun，ZHANG Xi，ZHAO Shukai，et al. Model of pore water pressure development in saturated soft clay around a subway tunnel under vibration load[J]. China Civil Engineering Journal，2007，40(4)：82-86.(in Chinese))
[22]	HYODO M，YAMAMOTO Y，SUGIYAMA M. Undrained cyclic shear behaviour of normally consolidated clay subjected to initial static shear stress[J]. Soils and Foundations，1994，34(4)：1-11.
[23]	HSU C C，VUCETIC M. Threshold shear strain for cyclic pore-water pressure in cohesive soils[J]. Journal of Geotechnical and Geoenvironmental Engineering，2006，132(10)：1 325-1 335.
[28]	中华人民共和国国家标准编写组. GB/T 50123—1999 土工试验方法标准[S]. 北京：中国建筑工业出版社，1999.(The National Standards Compilation Group of People?s Republic of China. GB/T 50123—1999 Standard for soil test method[S]. Beijing：China Architecture and Building Press，1999.(in Chinese))
[1]	BERRY P L，POSKITT T J. The consolidation of peat[J]. Geotechnique，1972，22(1)：27-52.
[25]	MONISMITH C L，OGAWA N，FREEME C R. Permanent deformation characteristics of subgrade soils due to repeated loading[J]. Transport Research Record，1975，537：1-17.
[7]	桂跃，余志华，刘海明，等. 高原湖相泥炭土固结系数变化规律试验研究[J]. 岩石力学与工程学报，2015，35(增1)：3 259-3 267. (GUI Yue，YU Zhihua，LIU Haiming，et al. Experimental study of the change law of consolidation coefficient of the plateau lacustrine peaty soil[J]. Chinese Journal of Rock Mechanics and Engineering，2015，35(Supp.1)：3 259-3 267.(in Chinese))
[9]	柳雁玲. 草炭土路基沉降与变形特性研究[博士学位论文][D]. 长春：吉林大学，2006.(LIU Yanling. Research on settlement and deformation characteristics of peat soil roadbed[Ph. D. Thesis][D]. Changchun：Jilin University，2006.(in Chinese))
[19]	王军，蔡袁强，徐长节. 循环荷载作用下软黏土刚度软化特征试验研究[J]. 岩土力学，2007，28(10)：2 138-2 144.(WANG Jun，CAI Yuanqiang，XU Changjie. Experimental study on degradation of stiffness of saturated soft clay under undrained cyclic loading[J]. Chinese Journal of Geotechnical Engineering，2007，28(10)：2 138- 2 144.(in Chinese))
[21]	LANDVA A O，KORPIJAAKKO E O，PHEENEY P E. Geotechnical classification of peats and organic soils[S]. Testing of peats and organic soils，ASTM STP 820，American Society of Testing and Materials，1983：37-51.
[3]	MESRI G，STARK T D，AJLOUNI，M. et al. Secondary compression of peat with or without surcharging[J]. Journal of Geotechnical and Geoenviromental Engineering，1997，123(5)：411-421.
[15]	PARR G B. Some aspects of the behaviour of London clay under repeated loading[Ph. D. Thesis][D]. UK：UK University of Nottingham，1972.
[27]	CHAI J C，MIURA N. Traffic-load-induced permanent deformation of road on soft subsoil[J]. Journal of Geotechnical and Geoenvironmental Engineering，ASCE，2002，128(11)：907-916
[2]	MADASCHI A，GAJO A. One-dimensional response of peaty soils subjected to a wide range of oedometric conditions[J]. Geotechnique，2015，65(4)：274-286.
[4]	MESRI G，AJLOUNI M. Engineering properties of fibrous peats[J]. Journal of Geotechnical and Geoenviromental Engineering，2007，133(7)：850-866.
[6]	刘伟，赵福玉，杨文辉，等. 安嵩线草海段泥炭质土的特征及性质[J]. 岩土工程学报，2013，35(增2)：671-674. (LIU Wei，ZHAO Fuyu，YANG Wenhui，et al. Features and properties of peaty soil in Caohai section of Anning-Sonming line[J]. Chinese Journal of Geotechnical Engineering，2013，35(Supp.2)：671-674.(in Chinese))
[8]	吕岩，佴磊，徐燕，等. 有机质对草炭土物理力学性质影响的机理分析[J]. 岩土工程学报，2011，33(4)：655-660.(LU Yan，NIE Lei，XU Yan，et al. The mechanism of organic matter effect on physical and mechanical properties of turfy soil[J]. Chinese Journal of Geotechnical Engineering，2011，33(4)：655-660.(in Chinese))
[10]	蒋忠信，黄俊，陈国芳. 南昆线七甸泥炭土路基加固的沉降控制[J]. 铁道工程学报，1998，(4)：79-89.(JIANG Zhongxin，HUANG Jun，CHEN Guofang. Subsidence control for reinforcing peat soil roadbed in the Qidian worksite of Nanning-Kunming railway[J]. Journal of Railway Engineering Society，1998，(4)：79-89.(in Chinese))
[13]	陈颖平，黄博，陈云敏. 循环荷载作用下结构性软黏土的变形和强度特性[J]. 岩土工程学报，2005，27(9)：1 065-1 071.(CHEN Yingping，HUANG Bo，CHEN Yunmin. Deformation and strength of structural soft clay under cyclic loading[J]. Chinese Journal of Geotechnical Engineering，2005，27(9)：1 065-1 071.(in Chinese))
[5]	O?KELLY B C. Effective stress strength testing of peat[J]. Proceedings of the ICE，Environmental Geotechnics，2015，2(1)：34-44.
[12]	TSB. Railway investigation report R04Q0040[R]. [S. l.]：The Transportation Safety Board of Canada，2004.
[17]	黄茂松，姚兆明. 循环荷载下饱和软黏土的累积变形显式模型[J]. 岩土工程学报，2011，33(3)：325-331.(HUANG Maosong，YAO Zhaoming. Explicit model for cumulative strain of saturated clay subjected to cyclic loading[J]. Chinese Journal of Geotechnical Engineering，2011，33(3)：325-331.(in Chinese))
[24]	闫澍旺，封晓伟，田俊峰. 循环荷载下滨海软黏土孔压发展规律及强度弱化特性[J]. 中国港湾建设，2010，169(增1)：86-89.(YAN Shuwang，FENG Xiaowei，TIAN Junfeng. Pore pressure development and strength softening character of littoral soft clay under cyclic loading[J]. China Harbour Engineering，2010，169(Supp.1)：86-89.(inChinese))
[14]	王常晶，陈云敏. 交通荷载引起的静偏应力对饱和软黏土不排水循环性状影响的试验研究[J]. 岩土工程学报，2007，29(11)：1 742-1 747. (WANG Changjing，CHEN Yunmin. Study on effect of traffic loading induced static deviator stress on undrained cyclic properties of saturated soft clay[J]. Chinese Journal of Geotechnical Engineering， 2007，29(11)：1 742-1 747.(in Chinese))
[26]	LI D，SELIG E T. Cumulative plastic deformation for fine-grained subgrade soils[J]. Journal of Geotechnical Engineering，1996，122(12)：1 006-1 013.