主应力方向变化对松砂不排水动强度特性的影响

针对相对密度为Dr=30%的福建标准砂,利用新研制的土工静力-动力液压三轴-扭转多功能剪切仪进行了扭转和竖向循环耦合剪切试验和循环扭剪试验。通过对比三向非均等固结条件下的两类试验结果,着重研究了初始主应力方向变化和振动过程中主应力方向连续变化对松砂的动强度特性的影响。

Effect of variation of principal stress orientation on undrained dynamic strength behavior of loose sand

The geotechnical static and dynamic universal triaxial and torsional shear apparatus newly developed in Dalian University of Technology is used to perform experimental tests of loose sands with a relative density of 30% subjected to vertical-and-torsional coupling cyclic shear with rotation of principal stress axes induced by ocean wave and simple torsional shear. The effect of initial orientation of principle stress axes and the continuous change of principle stress direction under cyclic loading on dynamic strength behavior of Chinese Fujian standard sand under anisotropic consolidation condition is investigated. For anisotropic consolidation condition under different initial orientation of principal stress, two types of cyclic tests are conducted.