Stability Analysis of Reinforced Expansive Soil Slope based on Fluid-solid Interaction
It is a typical fluid-solid coupling problem that geogrid-reinforced expansive soil slope produces swelling deformation and even instability failure under the influence of rainfall.In order to explore the stability of reinforced expansive soil slope under rainfall,firstly,based on the fluid-solid coupling,saturated-unsaturated seepage theory and Biot consolidation theory,a fluid-solid coupling analysis method which comprehensively considers the seepage-deformation-stress of expansive soil is constructed by using the FLAC3D secondary development platform and the built-in FISH language.Secondly,combined with the actual project,based on FLAC3D software,the impact of various interface characteristic parameters,reinforcement length,and reinforcement spacing of geogrid on slope stability during rainfall events are studied.The results show that geogrid reinforcement can effectively enhance slope stability;with the increase of interface characteristic parameters and reinforcement length of geogrid,and the decrease of reinforcement spacing,the slope stability is gradually improved;and the grid layout scheme of"dense at the bottom and sparse at the top"is more reasonable than the uniform layout scheme.
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