考虑饱和度变化的一维电渗固结模型

现有电渗固结理论和数值模型通常基于饱和土假设,与实际情况有差距。基于分段线性差分法,建立一种考虑饱和度变化的一维电渗固结模型UEC1。该模型考虑了土体电渗固结过程中饱和度的变化及土性参数的非线性关系,并编制了FORTRAN计算程序。UEC1在考虑饱和度变化情况下的计算结果与实测结果吻合。结合算例,给出了考虑饱和度变化情况下的电渗固结数值解,分析了固结过程中孔隙水压、孔隙气压、饱和度及沉降量随时间的变化规律,其中残余饱和度对土体电渗固结沉降量的影响显著。

One-dimensional electroosmosis consolidation model considering variable saturation

The existing models for electroosmosis are based on the hypothesis of fully saturated soil regime. Variable saturation occurs in the soil regime, thus a new model is expected to improve the calculation accuracy. This study proposes a numerical model, UEC1, for one-dimensional electroosmosis consolidation considering variable saturation. This model employs piecewise linear finite difference method to account for the nonlinear variation of physical and electro-chemical soil properties caused by the large deformation occurring during the consolidation. The FORTRAN programming package is used to implement the computation of the model. An excellent agreement is obtained between the UEC1 and test results. This model is applied to example studies to demonstrate the consolidation progress of partially saturated soils. The numerical calculations indicate that the residual saturation degree has significant influence on soil settlement.