土木与环境工程学报（中英文）2025，Vol.47Issue(4)：46-57,12.DOI:10.11835/j.issn.2096-6717.2024.023
考虑非饱和土水-力耦合特性的加筋路堤湿化变形数值模拟研究
Numerical simulation of wetting-induced deformations of reinforced embankments considering hydro-mechanical coupled behavior of unsaturated soils
摘要
Abstract
The embankment fills are typically of an unsaturated state.Rainfall infiltration results in deformations of unsaturated fills due to wetting,leading to deformations of embankment slope.Geosynthetics have high tensile strength,which can effectively reduce the deformations of embankment and improve the stability.A constitutive model that considers the hydro-mechanical coupled behavior of unsaturated soils was introduced and implemented in the finite difference program FLAC.Triaxial testing data involving loading and wetting paths were used to validate the constitutive model implemented in FLAC.Using the validated constitutive model to simulate the embankment fill,the deformation behavior of unsaturated reinforced embankments subjected to rainfall infiltration was investigated.The influence of geosynthetic reinforcement on the wetting-induced deformations of embankments was investigated.The results show that the reinforcements have negligible impact in the unreinforced zone.However,the reinforcements could effectively reduce the volumetric strains and shear strains of the soil elements in the reinforced zone.The reinforcements have a negligible effect on surface settlement in the unreinforced zone near the centerline of embankment but are effective in reducing surface settlement at the shoulder and lateral displacements of embankment slope under rainfall.The longer reinforcements are more efficient in reducing surface settlements of embankment and lateral displacements of slope and could also increase the distance between the slope surface and the potential failure surface.关键词
非饱和土/水-力耦合/本构模型/湿化变形/降雨入渗/加筋路堤Key words
unsaturated soil/hydro-mechanical coupling/constitutive model/wetting-induced deformation/rainfall infiltration/reinforcement embankment分类
交通工程引用本文复制引用
吴昊,栾晓寒,曾长贤,郑俊杰,郑烨炜..考虑非饱和土水-力耦合特性的加筋路堤湿化变形数值模拟研究[J].土木与环境工程学报（中英文）,2025,47(4):46-57,12.基金项目
国家自然科学基金(52078392、52078236) （52078392、52078236）
国家重点研发计划(2022YFC3080400) National Natural Science Foundation of China(Nos.52078392,52078236) （2022YFC3080400）
National Key R&D Program of China(No.2022YFC3080400) （No.2022YFC3080400）
