海洋粉质粘土在波浪荷载作用后的不排水抗剪强度衰化特性

Degradation of undrained shear strength of marine silty clay after undrained cyclic loading

通过对南海重塑粉质粘土土样的大量动三轴试验结果分析 ,得到此种土在波浪荷载作用后不排水抗剪强度衰化同动载作用引起的动应变幅及平均累积孔压之间的相互关系和预估公式 ;并通过与超固结土样的静三轴剪切试验结果的比较 ,发现动、静三轴两种试验结果具有很好的吻合关系。建议可用超固结土样的静三轴剪切试验同时结合部分动三轴试验来预估土样在波浪荷载作用后不排水抗剪强度衰化与平均累积孔压之间的关系。

From a series of static and cyclic triaxial compression test results, it is found that the degradation of undrained shear strength is associated with the cyclic strain or average accumulated pore pressure under cyclic loading conditions. The results of static triaxial compression tests on over consolidated marine silty clay are very consistent with those of cyclic triaxial tests. This static triaxial test method is proposed in order to simply estimate the relation between the degradation of undrained shear strength of clay and average accumulated pore pressure under undrained cyclic loading.