复杂水力路径下非饱和流动的数值分析

›› 2010, Vol. 31 ›› Issue (S2): 383-389.

复杂水力路径下非饱和流动的数值分析

陈盼，韦昌富，李幻，陈辉，魏厚振

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071

收稿日期:2010-07-29 出版日期:2010-12-10 发布日期:2011-01-12
通讯作者: 韦昌富，1966年生，男，研究员，主要从事非饱和土力学与多相孔隙介质多场耦合问题方面的研究工作。 E-mail:cfwei@whrsm.ac.cn
作者简介:陈盼，男，1984年生，博士研究生，主要从事非饱和土渗流与边坡稳定性分析方面的研究。
基金资助:
国家自然科学基金（No. 19872211）；岩土力学与工程国家重点实验室重点方向性项目(Q110601)；中国科学院“百人计划”择优项目资助

Numerical analysis of unsaturated flow in porous media under complicated hydraulic path

CHEN Pan, WEI Chang-fu, LI Huan, CHEN Hui, WEI Hou-zhen

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2010-07-29 Online:2010-12-10 Published:2011-01-12

摘要/Abstract

摘要：

多孔介质中的流动问题，与孔隙介质的特性，含水量状态以及含水量的变化历史密切相关。基于毛细循环滞回理论模型，考虑含水量变化历史对土水特征关系的影响，在开发的U-DYSAC2有限元程序中进行了相应的数值实施。在试验给定的初边值条件下进行了非饱和渗流模拟分析，并将模拟结果与实测数据比较，表明在压力边界条件反复变化下，考虑滞回效应能获得更接近实测的结果，证实该模型在模拟各种循环变化条件下非饱和土渗流初边值问题的适用性与必要性。对入渗重分布反复变化条件下非饱和土柱流动的数值模拟表明，考虑滞回与不考虑滞回条件下，含水量、孔隙水压力和湿峰的迁移的预测在入渗后的重分布过程差异较大。考虑滞回效应时，土柱上部的脱湿速率、下部的吸湿速率比不考虑滞回时要低。从而证实了非饱和多孔介质中的土水状态依赖于含水量变化，而且强烈依赖于土体的水力路径变化。因此，循环边界条件变化下，毛细滞回效应在非饱和渗流模拟中的影响显著，必须加以考虑。

关键词: 渗流分析, 毛细滞回, 非饱和流动, 有限元方法, 数值模拟

Abstract:

Unsaturated flow problem in a porous medium is closely related to the characteristics of porous medium, soil moisture state and its drying/wetting history. Based on capillary cyclic hysteresis model which considers the effect of the history of water content on the relation of soil water characteristics, a modified U-DYSAC2 finite element program is developed to simulate the unsaturated seepage problems. Unsaturated flow analysis is done under experimental conditions. Compared the simulated results with experimental data from the literature, the results with hysteresis effect are much nearer to the data from the tests undergoing repeating changes of pressure boundary conditions. Hence the applicability and necessity of the numerical model is verified being capable for modeling the intial boundary problems of unsaturated seepage. Subsequently, an example is shown for flow analysis in a soil column subjected to complicated infiltration redistribution history. The results show that the discrepancy of water content, pore water pressure and movement rate of wetting front in the column is large during redistribution process considering hysteresis effect and non-hysteresis effect respectively. It is shown that rate of drying in uppper layer and rate of wetting in lower layer considering hysteresis effect than that of nonhysteresis analysis. The simulated results confirm that soil moisture state in unsaturated porous media is not only dependent on water content, but also related to hydraulic path in porous medium. Hence, under cyclic change of boundary conditions, it is necessary to consider hysteresis effect in modeling unsaturated seepage problems.

Key words: seepage analysis, capillary hysteresis, unsaturated flow, finite element method, numerical simulation

中图分类号:

TD 324

陈盼，韦昌富，李幻，陈辉，魏厚振. 复杂水力路径下非饱和流动的数值分析[J]. , 2010, 31(S2): 383-389.

CHEN Pan, WEI Chang-fu, LI Huan, CHEN Hui, WEI Hou-zhen. Numerical analysis of unsaturated flow in porous media under complicated hydraulic path[J]. , 2010, 31(S2): 383-389.

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