华中科技大学学报（自然科学版）2025，Vol.53Issue(2)：9-16,8.DOI:10.13245/j.hust.250818
填埋场非饱和土质覆盖层中水气耦合运移解析解
Analytical solution for coupled water-gas transport in unsaturated soil cover of landfill
摘要
Abstract
An analytical solution for the coupled water-gas transport in unsaturated soil cover was proposed,which can consider the transient diffusion-convection process of gas transport under transient water transport conditions.The proposed solution was validated against COMSOL software simulations.Using this validated analytical solution,the water and gas transport in unsaturated soil cover was analyzed.The results highlight the significant impact of the coupling effect on gas transport and find that the surface gas emission flux of the cover layer without considering water transport and assuming a steady-state distribution of water transport is underestimated by 33.4%and 18.2%,respectively,compared to considering the water air coupling effect.Moreover,thicker soil cover exhibits more obvious water-gas coupling effect and gives reduced accumulated percolation and gas emission flux,resulting in improved anti-seepage and gas sealing performance.The more frequent the rainfall,the greater the accumulated percolation in the soil cover after the drying and wetting cycles,resulting in a smaller surface gas emission flux.Additionally,increasing the initial pore water pressure of the cover significantly reduces the surface gas emission flux.The proposed analytical solution can consider the coupling effect,making it more consistent with real engineering compared to the existing analytical solutions that separately consider water transport and gas transport.关键词
土质覆盖层/水气耦合运移/解析解/孔隙水压水头/气体排放通量Key words
soil cover/coupled water-gas transport/analytical solution/pore water pressure head/gas emission flux分类
土木建筑引用本文复制引用
闵明,蒲诃夫,文小俊,邓圣义..填埋场非饱和土质覆盖层中水气耦合运移解析解[J].华中科技大学学报（自然科学版）,2025,53(2):9-16,8.基金项目
国家重点研发计划资助项目(2019YFC1806000) （2019YFC1806000）
国家自然科学基金资助项目(52078235). （52078235）
