采用空心圆柱扭剪仪对原状饱和软黏土开展交通荷载诱发主应力幅值与主应力轴旋转耦合加载路径下的不排水试验研究。通过与循环三轴压缩试验对比,探讨主应力轴旋转对孔压、变形和应力–应变的影响。分析广义剪应力对循环刚度和非共轴性的影响。试验结果表明,相比较循环三轴试验,交通荷载应力路径下所诱发的主应力轴旋转使孔压和应变显著变大,应力–应变滞回圈刚度显著弱化。循环耦合加载路径下,存在剪切应力–应变和正偏应力–应变2种响应,应力–应变刚度呈现各向异性弱(强)化,应变增量矢量有显著的非共轴性,非共轴性有显著分段特征。较低剪应力水平下,应变路径轨迹趋于稳定,循环刚度表现为强化,非共轴性趋于增大;而较高剪应力水平下,应变路径轨迹趋于破坏,随循环弱化,非共轴性减小。 The undrained test study on the load-induced principal stress amplitude and principal stress axis-loaded loading path of the original saturated soft clay was carried out using a hollow cylindrical shear-torture instrument. By comparing with the cyclic triaxial compression test, the effect of principal stress axis rotation on pore pressure, deformation and stress-strain is discussed. The effect of generalized shear stress on cyclic stiffness and non-coaxiality is analyzed. The experimental results show that compared with the cyclic triaxial test, the rotation of the principal stress axis induced by the traffic load stress path significantly increases the pore pressure and strain, and the stress-strain hysteresis loop stiffness is significantly weakened. There are two kinds of shear stress-strain and positive-bias stress-strain response under cyclic coupled loading path. The stress-strain stiffness shows weak anisotropy (strong), and the strain increment vector has significant non-coaxiality, non-coaxiality. Sex has significant segmentation characteristics. Under the condition of lower shear stress, the strain path trajectory tends to be stable, the cyclic stiffness appears to be strengthened, and the non-coaxiality tends to increase. At higher shear stress levels, the strain path trajectory tends to be destroyed, and with the weakening of the cycle, non-communism Axiality decreases.