基于扰动状态理论的软土压缩变形试验

Experimental Research on Compressive Deformation of Soft Soil Based on Disturbed State Theory

基于扰动状态理论对漳州和东莞软土扰动样和重塑样单向压缩变形的结构性特征进行了分析,利用重塑样试验数据还原了原状样的压缩曲线,将变形中的土体视为相对完整状态和完全调整状态的混合物,定义原状土样为相对完整状态、重塑土样为完全调整状态,且分别用土弹性模型和修正剑桥模型表达,扰动函数与荷载对数具有较好的幂函数关系,因此建立了土体应力应变关系扰动状态模型,并通过压缩试验结果对模型合理性进行了验证。结果表明,该模型能较好地描述土体压缩变形特性,且参数确定简单易行,为软土地基工程沉降分析提供了一定参考。

One-dimensional compressive structural deformation properties of disturbed and remolded soft soil samples in Zhangzhou and Dongguan are analyzed based on the disturbed state concept theory.The compression curve of the remolded sample is restored to the original state.The soil can be taken as a mixture of two constituent parts in the relative intact and fully adjusted states.By defining undisturbed sample in the relative intact state expressed by elastic model,remolded sample in the fully adjusted state expressed by modified cambridge model and the disturbance function having a good power function with logarithm load,the disturbed state model of stress-strain relationship is suggested.The reasonability of this model has been verified by compression test data.The results show that it is easy to determine the parameters and the model is suitable to describe compressive deformation properties of soft soil,which can provide a reference for the settlement analysis of soft soil foundation engineering.