大变形固结计算模型及定解条件的探讨

本文考虑了孔隙比与有效应力、孔隙比与渗透系数的非线性关系,建立了一维普遍大变形非线性固结方程,并详细讨论了初始条件及排水、不排水、半排水等边界条件对土体固结的影响.应用显式与隐式差分相结合的方法离散了该方程,以吹填土实验资料为依据,计算了初始固结时土体的非均匀性与土体边界孔隙比随过程变化这两种因素所组合的四种情况.结果表明,本文所建立的大变形计算模型是合理可行的,所建立的固结方程以及半排水情况下的计算式是正确的,可应用于实际工程计算.

Study on Initial Condition and Boundary Conditions of Large Deformation Consolidation Theory

In this paper a one-dimensional general large-strain consolidation equation is established by considering the nonlinear relationship between the void ratio and the effective stress and that between the void ratio and thecoefficient of permeability.This paper also discusses in detail the initial condition,drain boundary condition,non-drain boundry condition and partial-drain boundary condition and their influence on soil consolidation.Finally,calculations are performed for the consolidation of filled soil.The calculated results for the four cases,which result from the combinationof nonuniformity of soil under initial consolidation conditions and the variation of boundary void ratio with its variance course,show that large-strain consolidation model is resonable,and the consolidation equation is correct.