饱和软黏土在地铁荷载作用下微结构定量化研究
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摘要
采用GDS循环三轴试验、压汞分析,同时辅以电镜扫描,对上海地区地铁行车荷载作用下的饱和软黏土微观性状进行定量分析研究,获得了一系列定性、定量化的结果。研究成果表明在地铁运营相当长的一段时间内,隧道侧壁和底部地层都会存在结构单元之间的压密过程,而由于隧道底部承受来自地铁的荷载较大,压密趋势有所缓和,单元之间的错动将会是变形的主要因素。
Microstructure change of saturated soft clays under cyclic loading is studied by using cyclic triaxial test,mercury intrusion porosimetry(MIP) and scanning electron microscopy(SEM).The results show that after the subway tunnel is operational,the microstructure blocks in the soil surrounding the side wall and bottom of the tunnel would be compressed.The tendency of compaction is decreasing in the bottom soil of the tunnel because of larger subway loading,and the offset of microstructure blocks is the major form of deformation.
Microstructure change of saturated soft clays under cyclic loading is studied by using cyclic triaxial test,mercury intrusion porosimetry(MIP) and scanning electron microscopy(SEM).The results show that after the subway tunnel is operational,the microstructure blocks in the soil surrounding the side wall and bottom of the tunnel would be compressed.The tendency of compaction is decreasing in the bottom soil of the tunnel because of larger subway loading,and the offset of microstructure blocks is the major form of deformation.
引文
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[2]陈嘉鸥,叶斌,郭素杰.珠江三角洲黏性土微结构与工程性质初探[J].岩石力学与工程学报,2000,19(5):674-678(Chen Jiaou,Ye Bin,Guo Sujie.Primary exploration onengineering properties of softground microstructure inZhujiang delta[J].Chinese Journal of Rock Mechanics andEngineering,2000,19(5):674-678(in Chinese))
[3]邓津,王兰民,张振中,等.甘肃永登湿陷性新近堆积黄土的微观结构分析[J].西北地震学报,2005,27(3):267-271(Deng Jin,Wang Lanmin,Zhang Zhenzhong,et al.Analysis on microstructure of the recently cumulatedcollapsible loess in Yongdeng county,Gansu province[J].Northwestern Seismological Journal,2005,27(3):267-271(in Chinese))
[4]单红仙,刘媛媛,贾永刚,等.水动力作用对黄河水下三角洲粉质土微结构改造研究[J].岩土工程学报,2004,26(5):654-658(Shan Hongxian,Liu Yuanyuan,JiaYonggang,et al.Case study of microstructure transform ofsilt due to wave action on subaqueous slope of Yellow R.,China[J].Chinese Journal of Geotechnical Engineering,2004,26(5):654-658(in Chinese))
[5]周翠英,牟春梅.软土破裂面的微观结构特征与强度的关系[J].岩土工程学报,2005,27(10):1136-1141(ZhouCuiying,Mu Chunmei.Relationship between micro-structural characters of fracture surface and strength of softclay[J].Chinese Journal of Geotechnical Engineering,2005,27(10):1136-1141(in Chinese))
[6]王国欣,黄宏伟,肖树芳.软土微结构特征的试验研究[J].水利学报,2005,36(2):190-196(Wang Guoxin,Huang Hongwei,Xiao Shufang.Experimental study onmicro-structural characteristics of soft soil[J].Journal ofHydraulic Engineering,2005,36(2):190-196(inChinese))
[7]唐益群,张曦,周念清,等.地铁振动荷载作用下饱和软黏土性状微观研究[J].同济大学学报(自然科学版),2005,33(5):626-630(Tang Yiqun,Zhang Xi,ZhouNianqing,et al.Microscopic study of saturated soft clay’sbehavior under cyclic loading[J].Journal of TongjiUniversity(Natural Science),2005,33(5):626-630(inChinese))
[8]赵书凯.地铁行车荷载下软黏土微观结构变形破坏机制研究[D].上海:同济大学地下建筑与工程系,2006(Zhao Shukai.The Study on the micro-structure distortionmechanics of soft clay under the subway-included loading[D].Shanghai:Department of Geotechnical Engineering,Tongji University,2006(in Chinese))
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