应力路径对粉土变形特性影响的试验研究  

Experimental study on influence of stress pathson deformation behavior of silt

作　　者：钱军杰 曹宇春 杨建辉 霍超 QIAN Junjie;CAO Yuchun;YANG Jianhui;HUO Chao(School of Civil Engineering and Architecture,Zhejiang University ofScience and Technology,Hangzhou 310023,Zhejiang,China)

机构地区：[1]浙江科技学院土木与建筑工程学院,杭州310023

出　　处：《浙江科技学院学报》2020年第6期557-562,共6页Journal of Zhejiang University of Science and Technology

基　　金：国家自然科学基金青年科学基金项目(40406019);浙江省公益技术应用研究计划项目(2014C33037);浙江省自然科学基金项目(LY14E080012)。

摘　　要：为了研究不同应力路径下的粉土变形特性,采用粉土试样进行了一系列不同应力路径的室内三轴固结排水试验,研究K 0固结状态下不同应力路径对粉土变形及塑性流动方向的影响规律。结果表明:在p-q应力空间中,沿0°和45°方向角的应力路径下,体应变为剪胀;沿大于45°方向角的应力路径下,体应变先剪胀后剪缩,且体应变程度随着固结围压的升高而减小;随着应力路径方向角的增大,塑性应变曲线顺时针旋转;在塑性剪应变塑性体应变空间中,塑性应力增量曲线随应力路径增量角的增大而逆时针旋转,同时塑性流动角增大。试验结果可为类似粉土地基工程提供参考。In order to study the deformation behavior of silt under different stress paths,a series of triaxial consolidated-drained tests were carried out on silt samples under different stress paths in laboratory,probing into the influence of different stress paths on the deformation and plastic flow direction of silt under K 0 consolidation state.The results show that in p-q stress space,the volume strain features dilatancy under the stress paths of stress direction angle from 0°to 45°.In the stress paths whose direction angles are greater than 45°,the volume strain exhibits dilatancy followed by contraction,and the volume strain magnitude decreases with the increase of consolidation confining pressure;the plastic strain curve rotates clockwise as the stress direction angle increases;in the plastic shear strain-plastic volume strain space,the plastic stress increment curve rotates counterclockwise as the increment angle of stress path increases while the plastic flow angle increases.The results can provide reference value for similar silt foundation engineering.

关 键 词：粉土 应力路径 塑性流动方向 剪胀 应力方向角 

分 类 号：TU441.6[建筑科学—岩土工程]