大孔隙参数对斜坡非均匀渗流与稳定性的影响OA北大核心CSTPCD

To investigate the influence of macropore parameters on the non-uniform migration and stability of slopes under rainfall,a solution model was developed based on the two-domain model and the stability coefficient field principle.This model addressed non-uniform flow and slope stability under rainfall infiltration.Using the COMSOL Multiphysics finite element platform,a corresponding model solving program was created.The numerical results were validated through indoor rainfall tests on macropore soil columns.A comparison was made between slope volume water content and point stability coefficient under conditions of uniform and non-uniform flow.Subsequently,the impact of macropore parameters(namely,the proportion of macropore domain ωf,the ratio of water conductivity between macropore and matrix domain μ,and the macropore empirical parameter rw)on slope seepage field and stability coefficient field was analyzed.The findings revealed that compared to scenarios without macropores,considering macropores led to a 7.7%increase in volume water content in the matrix domain and a 5.1%decrease in the macropore domain.Additionally,infiltration depth increased by 83.3%and 150.0%,respectively,and the shallow instability area of the slope expanded by 3.9%.Infiltration depth decreased with an increase in ωf for both the matrix and macropore domains.Conversely,with an in-crease in μ,infiltration depth decreased for the matrix domain and increased for the macropore domain.There was no significant relationship ob-served with the empirical parameter rw.At the end of the rainfall,volume water content in the matrix domain peaked,while the macropore do-main increased with higher values of ωf and μ,showing minimal impact from the empirical parameter rw.Water exchange was categorized into negative exchange area,positive exchange area,and no exchange area along the profile.The equilibrium depth of water exchange aligned with the change in infiltration depth of the matrix domain.Both the negative and positive exchange areas exhibited peak values that decreased with higher ωf and increased with higher μ and rw values.Under varying parameter values,the slope experienced shallow instability failures.Higher values of ωf and μ corresponded to deeper instability layers and lower point stability coefficients,indicating that macropores were detrimental to slope sta-bility.