Seepage-deformation Coupling Analysis of Unsaturated Slope Three-phase Flow Model Under the Rainfall

被引：0
|
作者：
Yang T. [1 ]
Wang S. [1 ]
Zhang Y. [1 ]
Tong K. [1 ]
机构：
[1] School of Resource and Civil Engineering, Northeastern University, Shenyang
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2021年 / 29卷 / 02期
关键词：
Pore gas pressure; Pore water pressure; Rainfall infiltration; Seepage-deformation coupling; Solid-liquid-gas coupling; Unsaturated soil slope;
D O I：
10.16058/j.issn.1005-0930.2021.02.009
中图分类号：
学科分类号：
摘要：
The process of rainfall infiltration in soil slope was accompanied by groundwater seepage propulsion, pore gas migration and slope soil deformation, thus this process involved solid-liquid-gas three-phase coupling of unsaturated soil.Firstly, based on the basic theory of unsaturated soil mechanics and soil-water characteristic curve model, the two-dimensional unsaturated soil slope solid-liquid-gas three-phase seepage-deformation coupled control equations considering the compressibility of porous media was established under the influence of gas-phase to rainfall infiltration process.Then, using the PDE platform of COMSOL Multiphysics software, the numerical results of the established coupled control equations were compared with the experimental results of the classical Liakopoulos sand column, and the correctness of the three-phase coupled control equations established in this paper was verified.Finally, the established coupling model was analyzed, and the effects of two-phase and three-phase coupling models on the seepage field and displacement field were compared.The results show that the pore water pressure increases with the increase of rainfall time, and pore gas migration and soil deformation can delay the propulsion of the rainfall infiltration.It is revealed that the solid-liquid-gas three-phase seepage-deformation coupling model can more truly reflect the characteristics of soil slope changes under rainfall, so as to provide some guidance for the disaster warning of unsaturated soil slope. © 2021, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：355 / 367
页数：12
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