斜坡降雨入渗迭代计算模型研究  

Research on Iterative Calculation Model of Slope Rainfall Infiltration

作　　者：檀康[1] 简文星[1] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2015年第4期168-172,共5页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41272306);国土资源部黄土地质灾害重点实验室开放基金项目(GLA2014002)

摘　　要：降雨是诱发斜坡失稳的最主要因素之一,研究降雨对斜坡稳定性的影响,其难点是如何计算降雨入渗过程中斜坡土体渗流场的变化规律。但是,从入渗量角度建立的传统田间入渗模型未考虑坡角的影响,无法满足斜坡稳定性的分析要求。基于Richard二维渗流控制方程与Parlange解法,从土体基质吸力水头角度推导出斜坡降雨入渗的迭代计算模型。该模型可以计算出低强度降雨条件下斜坡土体任意时间和空间的基质吸力,而且可以较为简便地计算出高强度降雨条件下斜坡表面积水时刻。利用有限元数值模拟软件对迭代计算模型进行验证,证明了此模型的适用性和准确性。Rainfall is one of the most important factors of slope failure. The key difficulty of studying the effect of rainfall on slope stability is how to calculate the process of rainfall infiltration. But the raditional field infiltration model which is established from the perspective of cumulative infiltration fails to consider the effect of slope angle, and can＇t meet the requirements of slope stability analysis. From the point of ma- trix suction head and based on the t^ichard seepage control equation and Parlange solution method, this pa- per establishes an iterative calculation model of slope rainfall infitration. The model can calculate the matrix suction of slope at any time and any space under the condition of low intensity rainfall, and can calculate slope surface ponding time easily under the condition of high intensity rainfall. Finally, the paper verifies the iterative calculation model with finite element numerical simulation software and proves that the model is feasible.

关 键 词：斜坡 降雨入渗 土体基质吸力 迭代 计算模型 

分 类 号：X93[环境科学与工程—安全科学] P642[天文地球—工程地质学]