中文摘要：

近年来,海岸沉积的粉质土在波浪作用下发生液化的问题开始被关注和研究。由于粉质土中含有黏粒成分,其液化机制可能与砂性土不同。通过对不同黏粒含量的粉质土进行循环荷载三轴试验,获得孔压、应变的变化曲线。以应变5%为土体破坏标准,结合土体的微结构特征,分析认为粉质土由于黏粒含量不同,存在液化破坏和触变破坏两种导致液化发生的机制。

英文摘要：

The coastal sedimentary silty soil is easy to be liquefied under wave action. In recent years, this issue has become a common concern of studies. Since the silty soil contains certain amount of clay, its liquefaction mechanism is different from sands. Through dynamic triaxial experiments carried out for the silty soil with different clay contents, we obtained the relation curve between pore pressure and strain. Take ε =5% as the criterion for soil failure, we discussed the results of experiments in this paper together with the micro-texture of the soil. It suggests that the liquefaction of the silty soil includes two types of mechanisms, i.e. liquefaction and thixotropy, depending upon clay contents.