基于水气二相流的边坡降雨入渗有限元分析

doi:10.11988/ckyyb.20150975

院报 ›› 2017, Vol. 34 ›› Issue (1): 120-123.DOI: 10.11988/ckyyb.20150975

基于水气二相流的边坡降雨入渗有限元分析

习念念^1,2, 童富果¹, 刘刚¹, 程庆超¹

1.三峡大学水利与环境学院,湖北宜昌 443002;
2.湖北省水利水电规划勘测设计院,武汉 430064

收稿日期:2015-11-16 出版日期:2017-01-01 发布日期:2017-01-13
通讯作者: 童富果(1972-),男,湖北宜昌人,教授,博士生导师,主要从事水工结构和岩土工程领域多场耦合(THMC)问题及其数值方法方面的研究,(电话)13972560499(电子信箱)tfg@ctgu.edu.cn。
作者简介:习念念(1990-),女,湖北襄阳人,硕士研究生,主要从事水工结构水气二相流耦合问题方面的研究,(电话)15090906272(电子信箱)nn_ctgu@163.com。
基金资助:
国家自然科学基金项目(51279090)

Finite Element Analysis of Water-air Two-Phase Infiltration in Slope

XI Nian-nian^1,2, TONG Fu-guo¹, LIU Gang¹, CHENG Qing-chao¹

1.College of Hydraulic and Environmental Engineering, China Three Gorges University,Yichang 443002, China;
2.Hubei Provincial Water Resources and Hydropower Planning Survey and Design Institute, Wuhan 430064,China

Received:2015-11-16 Online:2017-01-01 Published:2017-01-13

摘要/Abstract

摘要： 为揭示边坡降雨入渗基本规律,基于水气二相流理论,以三峡库区大坪滑坡为例,采用有限单元法分析边坡降雨入渗水气运动规律。结果表明:根据水气流入、流出的方向不同,坡表可分为吸入区和溢出区,通常坡体上部为水、气吸入区,下部为水、气溢出区;水、气进出坡表的总速率受降雨特性、坡面产流情况、气温变化等外在因素的影响较小,具有相对稳定性;在坡表吸入区,当降雨强度大于水气入渗总速率时,入渗强度等于水气入渗总速率,吸入区产流;反之,入渗强度等于降雨强度,吸入区不产流。此外,坡表饱和区水压力可通过孔隙气传递到地下水面,增大地下水的压力水头,不利于坡体稳定。

关键词: 水气二相流, 降雨入渗, 有限单元法, 非饱和渗流, 三峡库区边坡

Abstract: On the basis of the theory of two-phase (water and air) flow, the law of water-air movement caused by rainfall infiltration in slope was revealed by means of finite element method. Daping landslide in Three Gorges Reservoir was taken as a case study. The simulation results show that the slope surface can be divided into the inflow area and the outflow area according to the inflow and outflow of water and air. Usually the upper part of slope is inflow area, and the lower part is outflow area. The total infiltration rate of water and air in slope is relatively stable, slightly affected by rainfall characteristics, slope surface runoff and temperature changes. In the inflow area, when rainfall intensity is greater than infiltration rate, water in slope will run off, otherwise water or air will completely infiltrate. The saturation pressure of slope surface could transmit to groundwater surface through pore air, which increases the groundwater pressure head, unfavorable for slope stability.

Key words: water-air two-phase flow, rainfall infiltration, finite element method, unsaturated seepage, slope in Three Gorges Reservoir

中图分类号:

TV139.1

习念念, 童富果, 刘刚, 程庆超. 基于水气二相流的边坡降雨入渗有限元分析[J]. 院报, 2017, 34(1): 120-123.

XI Nian-nian, TONG Fu-guo, LIU Gang, CHENG Qing-chao. Finite Element Analysis of Water-air Two-Phase Infiltration in Slope[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2017, 34(1): 120-123.

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基于水气二相流的边坡降雨入渗有限元分析

Finite Element Analysis of Water-air Two-Phase Infiltration in Slope

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