排水条件对海洋粉质土动力特性的影响

The Effect of Drainage on Cyclic Behavior of a Marine Silty Soil

通过一系列不排水及排水条件下的周期三轴试验，对南海海洋粉质土的动力特性进行了研究。着重探讨了排水过程对动力特性的影响。试验结果表明，排水过程对正常固结的粉质土有强化作用。它提高了不排水静强度，降低了动孔压的发展速度，提高了动强度。在试验基础上，提出并验证了一个预测在不同排水条件下粉质土动力特性的方法，预测结果和试验结果比较相符。

A series of undrained and drained cyclic triaxial tests have been done to study the cyclic behavior of a Nanhai marine silty soil. In particular, importance of the effect of drainage on cyclic behavior was investigated. The experimental results show that drainage has a hardening effect on normally consolidated marine silty soil, it increases the undrained static strength, and decreases the generating rate of cyclic pore pressure and hence increases the cyclic resistance. On the basis of the previous and present research work, a method for predicting the cyclic properties of silty soil under various drainage conditions is developed in this paper. Comparisons of predictions with experimental results show generally favorable agreement.