多物理
饱和(图论)
饱和度
孔隙水压力
质量守恒
土壤水分
岩土工程
传质
气泡
机械
化学
环境科学
有限元法
材料科学
热力学
土壤科学
地质学
色谱法
组合数学
物理
数学
作者
Gailei Tian,Zhihong Zhang,Lei Guo
出处
期刊:Environmental Engineering Science
[Mary Ann Liebert]
日期:2022-04-01
卷期号:39 (4): 320-328
标识
DOI:10.1089/ees.2020.0493
摘要
Clay soils, usually in an unsaturated state, are widely used as barrier materials in solid waste landfills. When the saturation of clay soils is high, the gas phase will be in the form of entrapped bubbles. The entrapped bubbles can directly affect the soil hydraulic behavior, which further affects solute transport in clay liner. Therefore, based on the stress balance, fluid mass conservation, and solute mass conservation equations, and combined with the relationship between pore water pressure and air pressure in unsaturated state, a coupled hydro-mechanical-chemical model has been put forward to study the influence of entrapped bubbles on solute transport process. Using the proposed model, a series of numerical calculations are carried out through the finite element simulation software COMSOL Multiphysics. The numerical results show that the increase of entrapped bubble content can enlarge soil deformation and slow down the rates of excess pore fluid pressure dissipation and solute transport. In particular, when the degree of saturation in air phase increases from 0 to 0.2, the difference of influence depth at the transport time 10 years reaches 28 cm, and the breakthrough time of solute is prolonged by 17.8 years.
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