应力主轴循环旋转对砂土变形特性的影响(英文)

采用香港科技大学的空心圆柱扭剪仪进行了应力主轴固定单调剪切和应力主轴循环旋转两种不同路径的排水试验。通过应力主轴固定单调剪切试验分析了所制作砂样的初始各向异性特性。在应力主轴循环旋转试验中,控制施加在试样上的3个有效主应力的大小不变,仅应力主轴在0°～180°循环旋转。着重分析了4个应变分量及体应变随应力主轴循环旋转周数的变化关系、剪应力剪应变关系以及所施加的剪应力水平和有效球应力在应力主轴循环旋转过程中对砂土变形特性的影响。

Deformation behavior of sands subjected to cyclic rotation of principal stress axes

Two series of drained tests with fixed principal stress axes and cyclic rotation of principal stress axes were conducted with a hollow cylinder apparatus at Hong Kong University of Science and Technology.The inherent anisotropy of sands was investigated firstly through the shear tests with fixed principal stress axes.For the tests under the condition of cyclic rotation of principal stress axes,the magnitudes of three effective principal stresses were kept constant and only the principal stress axes rotated cyclically from 0° to 180° relative to vertical axis.The developments of four strain components and the volumetric strain with number of cycles,the relationship between shear stress and shear strain and the effects of deviatoric stress and effective mean normal stress were studied.