循环荷载作用下近海粉土工作性状的试验研究

Study on the workability of silt from seashore under cyclic loading effect

选用杭州湾区域的近海粉土为研究对象,采用固结不排水动三轴试验,研究低围压、小频率的循环荷载对粉土动力响应的影响,分析并模拟在不同频率、不同固结比的工作状况下,近海粉土的应变、动强度、孔隙水压力的变化规律;比较采用不同破坏标准的情况下近海粉土的动强度曲线和土体发生液化的可能性,探讨了动强度临界值的存在;提出了适合该地区近海粉土孔压发展的模型,并确定了模型参数,为研究近海粉土土体的稳定性及海洋构筑物的安全性提供科学依据.

Experiments were carried out in dynamic triaxial apparatus to study the dynamic response behavior of silt from Hangzhou Bay. The response was under low confining pressure and low frequency of cyclic loading. The behavior of silt, such as strain, dynamic strength, pore water pressure was studied. Two common failure criterions used to determine dynamic strength, were compared to study the compatibility to silt. and back analyzed parameters were determined. Proper pore water pressure model was proposed The overall objective of the paper is to provide some data to engineers involved in ocean-geotechnical engineering.