变形对非饱和土渗透系数影响规律模拟研究  

PROBABILITY BASED MODEL FOR INFLUENCE OF DEFORMATION ON HYDRAULIC CONDUCTIVITY FUNCTION OF UNSATURATED SOILS

作　　者：张雪东[1] 赵成刚[1] 刘艳[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程地质学报》2010年第1期132-139,共8页Journal of Engineering Geology

基　　金：国家重点基础发展研究计划项目(973)(编号:2010CB732100);国家自然科学基金(编号:50778013);北京市自然科学基金(编号:8082020)

摘　　要：渗透系数是非饱和土渗流分析中最重要的参数。本文以概率、统计理论为基础,结合流体力学的基本方程,建立了一个能够考虑孔隙结构影响的饱和土渗透系数计算模型,而后结合Mualeum(1976)的相对渗透系数模型以及Assou line(2006)提出并验证的孔隙结构参数随变形的变化规律,模拟了变形对非饱和土渗透系数的影响,通过和试验数据以及已有的模型对比。The hydraulic conductivity function is the key parameter in the seepage analysis of unsaturated soil.Based on the foundational equation of fluid mechanics and the theory of probability and statistics,this paper proposes a theoretical model for saturated permeability function.This model can take the influence of soil structure into account.It is combined with the Mualeum（1976）relative permeability function model,together with the variation law of the structural parameters during deformation proposed by Assouline（2006）.The influence of deformation on unsaturated permeability function is modeled.The paper compares the experimental results and some available models and the present model.The present model can improve the prediction precision without any increase of experimental workload.The necessities of applying statistic theory into soil mechanics is also discussed in the end of the paper.

关 键 词：非饱和土渗透系数 孔隙结构 概率论 统计学 变形 

分 类 号：P642.1[天文地球—工程地质学]