利用空心圆柱扭剪仪对饱和砂土进行不同主应力方向角下的定向剪切不排水试验,着重分析不同方向角下试样的轴向应变和扭剪应变的发展特性.试验结果表明:轴向应变随主应力角的增大而减小,从压应变逐渐转换为拉应变;当主应力方向为0°和90°时,试样不产生扭剪应变;而主应力角为45°时试样处于纯扭剪状态,扭剪应变达到最大值,并与轴向应变存在某种耦合作用.%Directional shear undrained tests of saturated sand under different principal stress angles are carried out using a hollow cylindrical torsional shear apparatus.The developmental characteristics of axial strain and torsional shear strain of samples under different direction angles are emphatically analyzed.The experimental results show that the axial strain decreases with the increase of principal stress angle and gradually changes from compressive strain to tensile strain;when the principal stress direction is 0°and 90°,the specimen does not produce torsional shear strain;while the principal stress angle At 45°,the specimen is in pure torsional shear state,the torsional shear strain reaches its maximum,and there is a certain coupling with the axial strain.
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