适用于斜坡降雨入渗分析的修正Green-Ampt模型

发布时间：2018-03-25 04:25

本文选题：降雨入渗　切入点：Green-Ampt模型　出处：《岩土力学》2016年09期

【摘要】：降雨入渗分析是预测降雨诱发滑坡的关键因素之一。Green-Ampt模型原理简单、使用方便,在浅层滑坡的降雨入渗分析中有很大的应用潜力,但该方法主要适用于初始含水率为均匀分布的情况。基于这一不足,推导了初始含水率为非均匀分布条件下降雨入渗深度和时间的关系,并给出了基于Runge-Kutta原理的数值解法。当初始含水率为均匀分布时,提出的方法可简化为文献中已有的Green-Ampt模型。当初始含水率为非均匀分布时,Richards方程预测所得的孔隙水压力分布图中土体饱和区和未受降雨影响的非饱和区之间存在一个较窄的过渡段,由新模型计算所得的湿润锋穿过这一过渡段,且靠近饱和部区的底部。总体而言,新方法计算所得的孔隙水压力分布与Richards方程求解结果类似。
[Abstract]:Rainfall infiltration analysis is one of the key factors in predicting rainfall induced landslides. Green-Ampt model is simple in principle and easy to use. It has great application potential in rainfall infiltration analysis of shallow landslides. But this method is mainly suitable for the condition that the initial water content is uniformly distributed. Based on this deficiency, the relationship between rainfall infiltration depth and time under the condition that initial water content is non-uniform distribution is deduced. A numerical solution based on Runge-Kutta principle is given. When the initial moisture content is uniformly distributed, The proposed method can be simplified to the existing Green-Ampt model in the literature. When the initial moisture content is non-uniform distribution, there exists between the saturated soil area and the unsaturated zone not affected by rainfall in the pore water pressure distribution map predicted by the Richards equation. A narrower transition, The wetting front calculated by the new model passes through the transition section and is near the bottom of the saturated region. In general, the pore water pressure distribution calculated by the new method is similar to that obtained by the Richards equation.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;上海市隧道工程轨道交通设计研究院;澳大利亚联邦大学工程信息学院;中国能源建设集团广东省电力设计研究院;
【基金】：上海浦江人才计划(No.12PJ1408700) 国家自然科学基金项目(No.41372275)~~
【分类号】：TU43

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