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利用环剪仪系统地研究了17种不同塑性指数的饱和黏性土在不同固结状态下的残余强度的变化规律,分析了当前法向应力、超固结比、塑性指数和多级剪切方式对残余强度的影响,重点给出了大变形条件下的抗剪强度指标随塑性指数的变化规律及实用公式。试验结果表明:残余强度随当前法向应力的增大而增大;超固结比对残余强度没有显著的影响;随着塑性指数的增大,残余强度逐渐减小;残余强度在较小的当前法向应力水平下具有明显的非线性;在大变形条件下,残余内摩擦角随塑性指数的增大而减小;最后给出了残余内摩擦角与塑性指数的函数关系式。
The variation of residual strength of 17 saturated soils with different plasticity indices under different consolidation conditions was systematically studied by means of a ring shear apparatus. The current normal stress, overconsolidation ratio, plasticity index and multi-level shear were analyzed Mode on the residual strength, the key is given under large deformation shear strength index with the plasticity index and practical formula. The experimental results show that the residual strength increases with the increase of the normal normal stress, the excess consolidation ratio has no significant effect on the residual strength, the residual strength decreases with the increase of the plasticity index, The current normal stress level has obvious nonlinearity. Under the condition of large deformation, the residual internal friction angle decreases with the increase of plasticity index. Finally, the residual internal friction angle as a function of plasticity index is given.