饱和多孔地基的非均匀特性分析

Analysis on Non-homogeneous Characteristics of Saturated Porous Foundation

在Gibson非均匀弹性地基模型的基础上,分析了土体波动分析中应用到的几种饱和土的非均匀地基。饱和土体非均匀性模型的选取对分析过程的难易程度以及得到结果的准确程度至关重要。在分析比较已有研究中的几种非均匀性假定的模型之后,提出了具有很好收敛性的梯度幂函数非均匀地基的假定,并给出了这种地基在不同情况下的弹性模量、孔隙率和渗透系数的变化规律。结果表明:梯度幂函数假设具有很好的收敛特性,比较接近地基的真实特性;而现有的几种非均匀地基比较适用于土层厚度较小,并且比较接近于均匀地基的情况,反之则与实际情况相差较大,不再适合用于描述地基的非均匀性。

Based on non-homogeneous elastic Gibson foundation model,several kinds of non-homogeneous saturated foundation are analyzed,which are applied to the dynamic response of soils.Appropriate heterogeneous model can make analysis easier and the result more accurate.In this paper,the assumption of gradient power function for non-uniform foundation is derived by comparing several kinds of existing heterogeneity models.The change rule of elasticity modulus,porosity and permeability for the new assumption is achieved.The result shows?that the assumption of gradient power function has very good convergence properties,which is close to the property of real foundation.However,the existing heterogeneity models were only suitable for small index function and soil thickness was thin.