主应力方向和初始成样含水率对饱和重塑粉土单调剪切特性的影响

利用“土工静力-动力液压-三轴扭转多功能剪切仪”，针对初始成样含水率分别为0、5%、10%，夯击法制备的饱和重塑粉土试样，在初始主应力方向角分别为0o、30o、45o的条件下进行非均等固结，然后保持平均主应力100 kPa、中主应力系数0.5、各主应力方向角以及加载速率恒定进行了应力控制式不排水单调剪切试验。着重探讨了主应力方向和初始成样含水率对饱和重塑粉土应力-应变关系、孔隙水压力变化及有效应力路径等的影响。试验结果表明：主应力方向和初始成样含水率对饱和重塑粉土的变形及强度特性具有显著影响。初始成样含水率影响应力-应变关系，对剪切强度影响不太显著，但破坏标准的选择对试验结果影响明显，干装样的孔压值低于湿装样；各种初始成样含水率的归一化剪切强度均随着主应力方向的增加而逐渐降低，而归一化孔压最大值则呈现增大的趋势

Experimental research on effect of orientation of principal stress and initial sampling water content on monotonic shear behavior of saturated remolding silt

By using the soil static and dynamic universal triaxial and torsional shear apparatus,the tamping method was taken to prepare the saturated remolding silt samples with initial sampling water contents of 0,5% and 10%.The initial anisotropic consolidation was done under the condition of the initial orientation angles of the principal stress at 0o,30o,45o respectively.The stress-controlled undrained monotonic shear tests were performed while the mean principal stress of 100 kPa,the intermediate principal stres...