红土地层路基边坡稳定性分析与防护结构参数优化设计OA

To address the unclear dynamic evolution mechanism of slope stability in West African red soil strata under heavy rainfall conditions and the lack of systematic optimization criteria for rock bolt support parameters,this study took a municipal road upgrading and expansion project as a case background.An innovative numerical analysis model considering unsaturated seepage-stress coupling was established to achieve dynamic simulation of slope stability throughout the entire rainfall infiltration process and to conduct parametric sensitivity analysis.This study systematically revealed the evolution rules of red soil slope stability during rainfall and,for the first time,proposed an optimized parameter range for rock bolt support applicable to West African red soil strata.Results show that:after 12 hours of continuous rainfall,the slope safety factor decreases from 1.627 to 1.092,a reduction of 32.9%.The optimal rock bolt support parameters are determined as:length of 8.0-9.0 m,inclination angle of 10°-15°,and spacing not greater than 2.5 m×2.5 m;under these conditions,the slope safety factor can be increased to over 1.450.A comprehensive comparison of four types of protective structures indicates that the combination of slope flattening and anti-slide piles delivers optimal performance in both safety and cost-effectiveness.