循环荷载下饱和软黏土的累积变形显式模型

Explicit model for cumulative strain of saturated clay subjected to cyclic loading

显式模型是计算交通等长期动荷载引起地基沉降的实用方法。在考虑影响饱和软黏土循环荷载下轴向循环塑性累积应变的应力历史、动偏应力水平及第一次轴向循环塑性累积应变与围压归一化基础上提出了计算饱和软黏土轴向循环塑性累积应变显式模型。模型同时反映了等向、偏压固结不排水循环加载轴向循环塑性累积应变发展规律,并很好地反映了围压的影响,其主要参数有明确的物理意义且易于确定。通过上海地区第④层饱和软黏土一系列静力三轴、循环加载试验验证了模型的合理性,得到了模型相关参数。

In order to analyze long-term settlement of the ground subjected to traffic loading,the simplified method based on explicit model for predicting the accumulative deformations is usually preferred.On the basis of considering the stress history,dynamic stress level and normalization between the axial plastic cumulative strain of the first cyclic loading and the average consolidated stress,an explicit model is proposed to calculate the axial plastic cumulative strain of saturated clay subjected to cyclic loading,and different consolidated conditions and confined stresses are reflected.The parameters are of physical significance and are easy to be obtained.Parameters of the explicit model are determined and the validity of the model is verified based on the undrained cyclic triaxial tests on consolidated Shanghai soft clay.