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中文摘要：
利用环剪仪针对塑性指数不同的3种黏性土，在不同的固结状态下进行了较系统的试验研究，探讨了大变形黏土的抗剪强度变化规律，分析了残余强度的影响因素。试验结果表明：本试验所采用的环剪仪无论对于粉质黏土还是黏土均具有良好的稳定性，测试精度高，因此能够保证试验结果的准确性；对于塑性指数不大的粉质黏土，应力历史对其抗剪强度的影响并不显著；对于塑性指数较大的黏土，应力历史对残余强度没有影响，而峰值强度随着超固结比的增大而增大，最终接近粉质黏土的峰值强度；塑性指数是影响残余强度非常重要的因素，随着塑性指数的增大，残余强度显著降低；黏性土剪切沉降曲线的类型与塑性指数和超固结比有关。
英文摘要：
Systematic research of experiments were conducted on three different plasticity index clay in dif- ferent consolidated condition by a ring shear apparatus. The variation of shear strength in large deformation and the effect factors of residual strength have also been investigated by tests. Test results indicate that the ring shear apparatus used in this study has good stability and high precision for both silty clay and clay, thus can guarantee the accuraty of the test results; stress history has no significant impact on shear strength to silty clay of low plasticity index; residual strength of high plasticity index can＇t be influenced by stress history, while peak strength increases with the increase of over-consolidation ratio, and finally close to the peak strength of silty clay; plasticity index is an important factor affecting the residual strength and residual strength is significantly reduced with the increase of the plasticity index; the type of shear settlement curve related to the plasticity index and over-consolidation ratio.
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