基于降雨-坡顶荷载相互作用的土-岩混合边坡稳定性分析OA

To reveal the instability mechanisms of Soil-Rock Mixture(SRM)slopes under coupled rainfall and slope top loading,a SRM seepage stress coupling model was established based on a road cutting project in Hunan Province,and a dynamic porosity permeability coefficient iterative algorithm was implemented in Midas GTS NX.Using the shear-strength reduction method,single-loading,single-rainfall,and combined scenarios were simulated to track the spatiotemporal evolution of pore-water pressure(PWP),shear stress/strain,and the factor of safety(Fs).Results showed that crest loading caused shear concentration at the bench-toe-platform junction,reducing Fs from 4.431 to 1.414;continuous rainfall lead to PWP build-up along the clay-mudstone interface,dropping Fs 2.275 within 3 h;under combined conditions the two effects were nonlinearly amplified and decreased to 0.947 at 24 h,with a throughgoing plastic band.It is concluded that drainage and reinforcement should be prioritized at the slope shoulder and the second-bench toe-platform junction.An early-warning reference is suggested as Fs≤1.05-1.30 accompanied by a sustained increase in displacement at critical locations.These findings provide quantitative guidance for load management and disaster-mitigation design of SRM slopes in rainfall-prone regions.