结构性黏土的压缩变形特性

海相软黏土的结构性对土体的变形与强度特性有着重要的影响，这种影响与爆炸挤淤置换法处理软基的置换深度直接相关，是海堤基础沉降与稳定性分析的不确定因素。为了探究结构性对海堤地基沉降的影响，并对海相软黏土的压缩特性进行定量分析，建立结构性黏土的压缩变形模型，同时给出模型参数的确定方法。利用文献中的试验数据对模型进行了验证，结果表明模型不仅适用于一维应力状态下的变形分析，能够描述三轴应力状态下结构性黏土的压缩特性。利用所建模型对浙江漩门地区海相软黏土的压缩特性进行模拟，分析表明，模型能较好地考虑结构性对该地区软黏土压缩变形的影响，为该地区海堤沉降的预测提供量化分析的手段，有助于加强结构性黏土地区海堤地基设计与施工的理论基础。

Compression deformation characteristics of structural clays

The effect of structure is important for the deformation and strength of marine soft clays. The replacing depth is also related to the structure of soft clays during the dealing progress of soft foundation, in which the blasting-based squeezing and replacing method is used. The structure may be an uncertain factor to evaluate the settlement and the stability of the embankment. In order to explore the effect of structure on the settlement of the foundation, a compression model of structural soils is established for analyzing the compression characteristics of marine soft clays quantitatively. The calibration method of model parameters is also given. The compression model is verified by the experimental data from literatures. The results show that the model is not only effective for predicting well the deformation at the 1D stress state but can be used to describe the compression characteristics at triaxial stress state. Then the model is adopted to analyze the compression characteristics of marine soft clays in Xuanmen area, Zhejiang province. The effect of structure on the compression deformation of soft clays in the area is simulated well by the new model. The model offers a quantificational method to predict the settlement of the embankment in the area. Furthermore, the model will be helpful for reinforcing the theoretical basis for design and construction of the embankment in the structural clay area.