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

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中图分类号：U416.1 文献标志码：A 文章编号：2096-6717（2025）04-0046-12

Abstract：Theembankmentfllsare tpically an unsaturated state.Rainfallinfitration results in deformations unsaturated fils due to weting，leading to deformations embankment slope. Geosynthetics have high tensile strength，which can efectively reduce the deformations embankment improve the stability.A constitutive model that considers the hydro-mechanical coupled behavior unsaturated soils was introduced implemented in the finite diference program FLAC.Triaxial testing data involving loading 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 unsaturated reinforced embankments subjected to rainfall infiltration was investigated.The influence geosyntheticreinforcement onthe wetting-induced deformations embankments was investigated.The results show that the reinforcements have negligible impact inthe unreinforced zone.However，the reinforcements could effectively reduce the volumetric strains shear strains the soil elements in the reinforced zone.The reinforcements have a negligible efect on surface settlement in the unreinforced zone near thecenterline embankment but are effective in reducing surface setlement at the shoulder lateral displacements embankment slope under rainfall. The longer reinforcements are more eficient in reducing surface settlements embankment lateral displacements slope could also increase the distance between the slope surface the potential failure surface.

Keywords：unsaturated soil；hydro-mechanical coupling；constitutive model；weting-induced deformation; rainfall infiltration;reinforcement embankment

地表大部分土体都处于非饱和状态，湿化变形是非饱和土的一个重要特征[1-2]。（剩余18611字）