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为探讨交通荷载引起的主应力轴旋转(即剪应力反转现象)对软黏土动力特性的影响,通过空心圆柱仪(HCA)试验系统,模拟交通荷载作用下土单元的真实应力路径,并对不同轴向偏应力、扭剪应力组合下,软黏土的累积孔隙水压力和累积应变特性进行了试验研究,分析了应力组合模式和幅值对软黏土动力学行为的影响规律。研究表明:施加扭剪应力(模拟主应力轴旋转)会增大软黏土的累积应变和累积孔压,且对孔压的增大影响比对应变更加显著;扭剪应力越大,这种增大效应显著加快,此时在研究交通荷载下软黏土长期变形时,需进行考虑主应力轴旋转的动力试验。
In order to explore the influence of main stress axis rotation (ie, shear stress reversal phenomenon) on the dynamic characteristics of soft clay caused by traffic load, the true stress path of soil element under traffic load was simulated by Hollow Cylinder (HCA) test system. Under the combination of different axial deviatoric stress and torsional shear stress, cumulative pore water pressure and cumulative strain of soft clay were studied. The influence of stress combination mode and amplitude on the dynamic behavior of soft clay was analyzed. The results show that the application of torsional shear stress (simulating the rotation of the principal stress axis) increases the cumulative strain and cumulative pore pressure of soft clay, and increases the influence of pore pressure more significantly than the strain of strain. The larger the torsional shear stress, The large effect is noticeably accelerated. At this time, when the long-term deformation of soft clay under traffic load is studied, the dynamic test considering the rotation of the principal stress axis is required.