考虑气相影响的降雨入渗过程分析研究

›› 2008, Vol. 29 ›› Issue (9): 2307-2313.

考虑气相影响的降雨入渗过程分析研究

孙冬梅^1,2，朱岳明³，张明进²，甄红锋⁴

1. 天津大学建工学院，天津300072； 2. 交通部天津水运工程科学研究院水工构造物检测、诊断与加固技术交通行业重点实验室，天津 300456； 3. 河海大学水利水电工程学院，南京 210098；4. 山东水利职业学院，日照 276826

收稿日期:2006-11-27 出版日期:2008-09-10 发布日期:2013-08-03
作者简介:孙冬梅，女，1978年生，博士后，主要从事饱和-非饱和渗流数值模拟及水资源的合理开发利用问题的研究
基金资助:
国家自然科学基金重点资助项目（No. 50539020）；科技部中奥两国科技合作基金项目（No. Ⅶ.A.1）江苏省国际合作项目资助（No. BZ2003046）。

Analysis of rainfall infiltration process considering influence of pore air pressure

SUN Dong-mei^{1, 2}, ZHU Yue-ming³, ZHANG Ming-jin², ZENG Hong-feng⁴

1. School of Civil Eng. of Tianjin Univ., Tianjin 300072, China ; 2. Tianjin Research Institute of Water Transport Engineering, Key Laboratory of Harbor & Marine Structure Safety Ministry of Communications, Tianjin 300456, China; 3. College of Water Conservancy & Hydropower Eng., Hohai Univ., Nanjing 210098, China; 4. Shandong Water Resources Vocational College, Rizhao 276826, China

Received:2006-11-27 Online:2008-09-10 Published:2013-08-03

摘要/Abstract

摘要： 降雨入渗过程是水在下渗的过程中驱替空气的水-气二相流过程，对这一过程的精确模拟一直是渗流计算的难点，目前的处理方法通常是忽略孔隙气压力变化的影响。根据多相流理论，结合质量守恒定律和达西定律，建立了水-气二相流模型，模型的求解采用积分有限差分法和Newton-Raphson迭代方法，通过变换主要变量来表达相态的变化，实现了水相、气相边界条件及降雨入渗边界的精确模拟。利用上述模型对一土柱试验进行模拟，从而验证了模型的正确性，研究了一均质土层的降雨入渗过程，得到了孔隙水压力、孔隙气压力和毛细压力及含水率的变化过程。根据入渗率与地表孔隙气压力的变化关系，验证了孔隙气压力的增大对入渗水流产生阻滞作用。在求解非稳定渗流问题中，考虑空气压力变化的影响是值得研究的。

关键词: 水-气二相流, 饱和-非饱和渗流, 积分有限差分法, 降雨入渗

Abstract: Rainfall infiltration is a process of water flow driving air flow through unsaturated soil, which is a difficult to exact simulate numerically in geotechnical engineering and the influence of pore air is ignored. In this paper, a water-air two-phase flow model is proposed based on the water-air mass balance equations, Darcy’s law and multiphase flow theory. The integral finite difference method and Newton-Raphson iterative method are used to solve the water-air two-phase model. By switching primary variables, a set of phase state (single phase and two-phase) are taken into account. The refined treatments of every boundary condition are described in detail. The water-air two-phase flow model is verified by simulating an experiment of water through an earth column. The process of rainfall infiltration is simulated numerically. The variation of pore water pressures, pore air pressure, capillary pressure and saturation of water and air phase in different depth of the soil are described; and it is verified that the water-air two-phase flow model is a better model to perform transient seepage problem; and airflow will obstruct water flow from infiltrating into the soil.

Key words: water-air two-phase flow, saturated-unsaturated seepage, integral finite difference method, rainfall infiltration

中图分类号:

O 357

孙冬梅，朱岳明，张明进，甄红锋 . 考虑气相影响的降雨入渗过程分析研究[J]. , 2008, 29(9): 2307-2313.

SUN Dong-mei , ZHU Yue-ming , ZHANG Ming-jin , ZENG Hong-feng . Analysis of rainfall infiltration process considering influence of pore air pressure[J]. , 2008, 29(9): 2307-2313.

参考文献

相关文章 15

[1]	汪华斌, 李建梅, 金怡轩, 周博, 周宇, . 降雨诱发边坡破坏数值模拟两个关键问题的解决方法[J]. 岩土力学, 2019, 40(2): 777-784.
[2]	朱才辉，郭炳煊. 古建筑基座渗漏监测及诱因分析[J]. , 2018, 39(11): 4210-4217.
[3]	郑俊杰，郭震山，崔岚，张军,. 考虑非饱和渗流与增湿膨胀下的膨胀土隧道稳定性分析[J]. , 2017, 38(11): 3271-3277.
[4]	熊勇林，朱合华，叶冠林，叶斌,. 降雨入渗引起非饱和土边坡破坏的水-土-气三相渗流-变形耦合有限元分析[J]. , 2017, 38(1): 284-290.
[5]	张洁，吕特，薛建锋，郑文棠,. 适用于斜坡降雨入渗分析的修正Green-Ampt模型[J]. , 2016, 37(9): 2451-2457.
[6]	豆红强，韩同春，龚晓南，李智宁，邱子义,. 降雨条件下考虑饱和渗透系数变异性的边坡可靠度分析[J]. , 2016, 37(4): 1144-1152.
[7]	田东方，郑宏，刘德富，. 考虑径流影响的滑坡降雨入渗二维有限元模拟及应用[J]. , 2016, 37(4): 1179-1186.
[8]	汪丁建，唐辉明，李长冬，葛云峰，易贤龙. 强降雨作用下堆积层滑坡稳定性分析[J]. , 2016, 37(2): 439-445.
[9]	覃小华，刘东升，宋强辉，王旭，吴润泽，辛建平, . 强降雨条件下基岩型层状边坡入渗模型及稳定性研究[J]. , 2016, 37(11): 3156-3164.
[10]	常金源，包含，伍法权，常中华，罗浩，. 降雨条件下浅层滑坡稳定性探讨[J]. , 2015, 36(4): 995-1001.
[11]	吴志伟，宋汉周,. 基于流-热耦合模型的土石坝渗流热监测研究[J]. , 2015, 36(2): 584-590.
[12]	蒋中明，熊小虎，曾铃,. 基于FLAC3D平台的边坡非饱和降雨入渗分析[J]. , 2014, 35(3): 855-861.
[13]	王继成，俞建霖，龚晓南，马世国，. 大降雨条件下气压力对边坡稳定的影响研究[J]. , 2014, 35(11): 3157-3162.
[14]	沈银斌，朱大勇，蒋泽锋，姚华彦 , . 降雨过程中边坡临界滑动场[J]. , 2013, 34(S1): 60-66.
[15]	韩同春，马世国，徐日庆 . 强降雨条件下气压对滑坡延时效应研究[J]. , 2013, 34(5): 1360-1366.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed