变形对土水特征曲线影响规律模拟研究  

Modeling study of the relationship between deformation and water retention curve

作　　者：张雪东[1,2] 赵成刚[2] 刘艳[2] 蔡国庆[2] 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]北京交通大学,北京100044

出　　处：《土木工程学报》2011年第7期119-126,共8页China Civil Engineering Journal

基　　金：水利部公益性行业科研专项(200801133);国家自然科学基金(51078019);北京市自然科学基金(8112024)

摘　　要：建立预测土水特征曲线随变形变化规律的模型是研究变形对非饱和土渗透系数影响的基础,它也可为建立考虑水力和力学耦合的非饱和土本构模型奠定基础。以概率论为基础,通过引入孔隙尺寸分布函数,建立了土中的平均孔隙半径与孔隙率之间的函数关系,并以此为基础得到了一个能够模拟孔隙率对土水特征曲线的影响规律的经验模型。通过计算和试验结果的对比分析,验证了这一模型的合理性。Modeling of the relationship between soil deformation and water retention curve is necessary for estimating the influence of soli deformation on the permeability characteristics of unsaturated soils,and for constitutive models accounting for both the mechanical and the hydraulic behaviors of unsaturated soils.Based on the theory of probability,and by introducing a pore size distribution function,a relationship between the average pore radius and soil porosity is established,and an empirical model capable of simulating the influence of soil density on water retention curve proposed.The calculation results from the model are validated by using related experimental data to demonstrate the rationality of the proposed model.

关 键 词：概率论 孔隙尺寸分布函数 土水特征曲线 平均孔隙半径 孔隙率 

分 类 号：TU411.4[建筑科学—岩土工程]