中文摘要：

土壤行为能在动态波浪和交通负担下面反映主要压力旋转的特征。用于土壤的张力、压缩的压力的不相等的振幅与纯主要压力旋转路径比较在基础土壤上有复杂效果。一系列 undrained 周期空扭力砍测试在典型 remolded 上被执行来自南京的 Ilexi 区域的软泥土，中国。主要控制参数是张力、压缩的压力振幅比率() 并且周期的动态压力比率() 。这被发现批评趋于在 0.13 点仍然保持不变，当压缩压力振幅的价值比张力的压力振幅高时。然而，张力的压力的影响被动态压力水平限制什么时候 = 1。为在土壤的明显的结构的变化，周期的颤动周期的相应数字被发现独立于在低压力层次并且仅仅与有关。最后，为评估 remolded 的失败的一个新方法软泥土被介绍。它考虑由主要压力旋转的复杂路径引起了的张力、压缩的压力的影响。这个标准能基于当也提供失败紧张和颤动周期的一个范围时，联合曲线的 pore-water-pressure-strain 区分稳定、批评、破坏的国家。这些结果用 constitu tive 模型为主要压力旋转的系统的研究提供理论支持。

英文摘要：

Soil behavior can reflect the characteristics of principal stress rotation under dynamic wave and traffic loads. Unequal amplitudes of tensile and compressive stresses applied to soils have complex effects on foundation soils in comparison with the pure principal stress rotation path. A series of undrained cyclic hollow torsional shear tests were performed on typical remolded soft clay from the Hexi area of Nanjing, China. The main control parameters were the tensile and compressive stress amplitude ratio（α） and the cyclic dynamic stress ratio（η）. It was found that the critical η tended to remain constant at 0.13, when the value of the compressive stress amplitude was higher than the tensile stress amplitude. However, the influence of the tensile stress was limited by the dynamic stress level when α= 1.For obvious structural change in the soil, the corresponding numbers of cyclic vibration cycles were found to be independent of α at low stress levels and were only related to η. Finally, a new method for evaluating the failure of remolded soft clay was presented. It considers the influence of the tensile and compressive stresses which caused by complex stress paths of the principal stress rotation. This criterion can distinguish stable, critical, and destructive states based on the pore-water-pressure-strain coupling curve while also providing a range of failure strain and vibration cycles. These results provide the theoretical support for systematic studies of principal stress rotation using constitutive models.