中主应力系数对应力主轴循环旋转条件下砂土变形特性的影响  

Effects of intermediate principal stress parameter on deformation behavior of sands under cyclic rotation of principal stress axes

作　　者：童朝霞[1,2] 张建民[2] 于艺林[2] 张嘎[2] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191 [2]水沙科学与水利水电工程国家重点实验室(清华大学),北京100084

出　　处：《岩土工程学报》2009年第6期946-952,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展规划(973计划)(2007CB714108);北京市自然科学基金项目(8061003)

摘　　要：采用香港科技大学的空心圆柱扭剪仪对日本标准丰浦砂进行了四个系列、每个系列包含中主应力系数b=0.1,0.5和1.0三种不同情况的纯应力主轴循环旋转排水试验,即试验过程中控制作用在砂样上的有效主应力的幅值不变,仅应力主轴在0°～180°循环旋转。试验发现中主应力系数b对应力主轴循环旋转条件下砂土的变形特性有显著影响,着重分析了这一参数对纯应力主轴循环旋转条件下砂土的应变分量和体应变的发展、剪应力剪应变关系曲线及流动规律等变形特性的影响。Four series of drained tests for the intermediate principal stress parameter b=0.1, 0.5 and 1.0 in each series under the condition of cyclic rotation of the principal stress axes are conducted on Toyoura standard sand with an automated hollow cylinder apparatus at Hong Kong University of Science and Technology. The test condition is that only the principal stress axes rotated cyclically from 0° to 180° relative to the vertical while the magnitudes of the effective principal stresses kept constant. The experimental results indicate that the intermediate principal stress parameter b has great effect on the deformation behavior of sand under the cyclic rotation of the principal stress axes. And its effects on the development of strain components and the volumetric strain, the relation between shear stress and shear strain components and the flow rule of sand under the cyclic rotation of the principal stress axes are studied.

关 键 词：应力主轴旋转 中主应力系数 砂土 变形特性 

分 类 号：TU43[建筑科学—岩土工程]