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为了有效地分析非饱和成层土的水—力耦合问题,基于非饱和土有效应力原理和渗流理论,考虑降雨过程中双层土孔隙特征及渗透性随应力的动态变化特点,建立了非饱和成层土一维降雨入渗水力耦合模型,利用Flex PDE软件编制计算程序,对一典型双层土降雨入渗模型进行了分析。结果表明,在雨水入渗过程中,上粗—下细型土的分界面处会出现较大的孔隙水压力变化,且耦合、非耦合情况差异明显;上细—下粗型土可不考虑入渗过程中水力的耦合效应;对于上粗—下细型土,短历时强降雨在土层接触带会产生较大的孔隙水压力突变。
In order to effectively analyze the water-soil coupling problem of unsaturated stratified soils, based on the theory of unsaturated soil effective stress and seepage theory, taking into account the dynamic characteristics of pore characteristics and permeability of stratified soils under rainfall, Stratified soil one-dimensional rainfall infiltration hydraulic coupling model, the use of Flex PDE software programming, a typical double soil rainfall infiltration model was analyzed. The results show that there is a large variation of pore water pressure at the interface of the upper coarse-lower fine soil during rainfall infiltration, and the coupling and uncoupling conditions are obviously different. The upper fine-lower coarse soil does not consider For the upper coarse-lower fine soil, the short duration strong rainfall will cause a large change of pore water pressure in the contact zone of soil.