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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。
Using the hollow cylindrical torsional shear instrument of Hong Kong University of Science and Technology, four series of Japanese standard Fengpu sand were carried out. Each series contained pure stress spindle rotating drainage test under three different conditions of principal stress coefficient b = 0.1, 0.5 and 1.0, That is to say, the magnitude of the effective principal stress acting on the sand sample during the test is constant, and only the stress spindle rotates at 0 ° -180 °. It is found that the main stress coefficient b has a significant influence on the deformation characteristics of sand under cyclic rotation of stress spindle. The development of strain components and bulk strain of sand under cyclic rotation of pure stress spindle is emphatically analyzed. The shear stress Shear strain curve and flow law and other deformation characteristics.