不同应力路径下基坑周边粉质黏土力学性状试验研究  

Experimental Study on Mechanical Properties of Surrounding Silty Clay of Foundation Pit with Different Stress Paths

作　　者：王利军 刘洋 何忠明[3] 王盘盘 WANG Lijun;LIU Yang;HE Zhongming;WANG Panpan(Guangzhou Metro Group Co Ltd,Guangzhou 510380,Guangdong,China;Pingjiang County Transportation Bureau,Pingjiang 414000,Hunan,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China)

机构地区：[1]广州地铁集团有限公司,广东广州510380 [2]平江县交通局,湖南平江414000 [3]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《矿冶工程》2023年第6期34-40,共7页Mining and Metallurgical Engineering

基　　金：广州地铁集团有限公司科研项目(HT200856);长沙理工大学研究生科研创新项目(CXCLY2022014)。

摘　　要：依托广州地铁琶洲站深基坑项目,采用FLAC^(3D)有限元软件对基坑开挖进行数值模拟,基于基坑工程周围土体的应力状态制定不同应力路径剪切试验方案,研究了不同应力路径条件对土体力学性状的影响。结果表明,应力路径可对土体的应力-应变关系、孔隙压力、抗剪强度指标产生较大影响;考虑基坑卸荷应力路径土体的抗剪强度低于常规试验所得土体抗剪强度。Based on a deep foundation pit project for Pazhou Station of Guangzhou Metro,numerical simulation was conducted with FLAC^(3D) finite element software for foundation pit excavation.Shear test schemes with different stress paths were prepared based on the stress state of the surrounding soil of the foundation pit,and the influence of different stress path on the mechanical properties of the soil was also studied.The results indicate that stress path can bring significant impact to the stress⁃strain relationship,pore pressure,and shear strength indicators of the soil.The shear strength of the soil in consideration of the unloading stress path of the foundation pit is lower than the shear strength obtained from conventional tests.

关 键 词：基坑开挖 数值模拟 应力路径 三轴试验 粉质黏土 土力学性状 

分 类 号：TV551[水利工程—水利水电工程]