考虑地表变流量的非饱和土渗流耦合的解析分析

吴礼舟; 黄润秋

考虑地表变流量的非饱和土渗流耦合的解析分析 English Version

成都理工大学地质灾害防治国家重点实验室，四川成都 610059

基金项目: 国家自然科学基金项目（40902087）；教育部科学技术研究重点项目（110186）；地质灾害防治与地质环境保护国家重点实验室自主研究课题（SKLGP2009Z011）；四川省杰出青年学术技术带头人培育计划项目（2010JQ0034）

详细信息

作者简介:
吴礼舟 (1975 – ) ，男，博士，副教授，主要从事岩土工程的科研教学工作。

中图分类号: TU44
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出版历程
- 发布日期: 2011-09-14

Analytical analysis of coupled seepage in unsaturated soils considering varying surface flux

(State Key Laboratory of Geological Hazard Prevention and Geological Environment Protection, Chengdu University of Technology, Chengdu 610069, China)

摘要

摘要: 基于含水率和渗透系数是孔隙水压力的指数函数假设，通过 Fourier 积分变换，获取了降雨入渗过程中一维非饱和土渗流–变形耦合的解析解，该解能考虑地表降雨强度的变化。当降雨强度小于土体的入渗能力时，地表边界受流量控制；降雨强度逐渐增加，超过土体的入渗能力，地表边界为孔隙水压力。该解不仅能考虑地表变流量的边界，还可以分析压力边界条件，另外适用于任意的初始条件。算例计算结果表明，耦合对渗流产生影响；当渗流达到稳定时，非饱和土变形–渗流的耦合效应消失。
- 非饱和土 /
- 降雨入渗 /
- 渗流–变形耦合 /
- 解析解 /
- Fourier 积分变换
Abstract: Based on the assumption that water content and permeability coefficient are exponential functions of pore-water pressure, the Fourier transform is used to obtain an analytical solution to one-dimensional coupled rainfall infiltration and deformation in unsaturated soils with varying surface rainfall flux. When the gradually increasing rainfall intensity is less than the saturated coefficient of permeability, a flux boundary condition is adopted. When the rainfall intensity is larger than the infiltration capacity of the saturated soils, a pore-water pressure boundary condition is used. The analytical solution can consider varying flux boundary conditions, pressure boundary conditions and arbitrary initial conditions. The calculated results of a case study show that the coupling effect has a markable effect on the pressure distribution for the transient unsaturated seepage. The coupling effect dissipates if the steady-state infiltration occurs.
- unsaturated soil /
- rainfall infiltration /
- coupled seepage and deformation /
- analytical solution /
- Fourier integral transformation

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参考文献(16)

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