上海粘性土剪切带形成的平面应变试验研究  

STUDY ON SHEAR BAND FORMATION IN SHANGHAI CLAY IN PLANE STRAIN COMPRESSION TESTS

作　　者：张启辉[1] 李蓓 赵锡宏[1] 董建国[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《大坝观测与土工测试》2000年第5期40-43,共4页Dam Observation and Geotechnical Tests

基　　金：国家自然科学基金资助项目!(5 97790 12 )

摘　　要：采用可进行边界变形局部化量测的平面应变仪 ,对上海典型硬粘性土 ( 2层褐黄色粉质粘土、6层暗绿色粉质粘土 )进行平面应变不排水剪切试验 ,研究局部化变形的初始分叉点、剪切带倾角随固结应力 σ3 之间的变化规律 ,评价 Columb和 Roscoe理论对剪切带倾角的预估 ,初步研究了剪切带内的变形机理。Plane strain undrained comprssion tests are performed with local deformation measurement devices on typical stiff clays(brown yellow silty clay, dark green silty clay) in Shanghai to determine the bifurcation point, the law of evolution of shear band orientation with the consolidation stress. At the same time, prediction of shear band orientation based on Mohr Column and Roscoe theory is evaluated. The mechanism of deformation inside shear band is studied preliminarily.

关 键 词：平面应变 分叉点 剪切带 粘性土 试验 

分 类 号：TU411.7[建筑科学—岩土工程] TU442[建筑科学—土工工程]