降雨及参数空间差异对高堆石边坡安全的影响研究OA

Rainfall infiltration significantly impacts the stability of high rockfill slopes;however,conven-tional deterministic analysis methods struggle to accurately reflect their true safety conditions under heavy rainfall.Therefore,taking a high rockfill slope at an airport in southwest China as the case study,we used the Green-Ampt infiltration model to calculate the wet front depth under different rainfall durations,and a random field approach to characterize the spatial variability of rockfill mechanical parameters.Our aim is to evaluate the coupled effects of heavy rainfall and parameter spatial variation on slope safety.The results indicate that rainfall infiltration depth increases approximately linearly with time;both the slope safety factor and reliability index decrease continuously with rainfall duration,with the reliability index ex-hibiting greater sensitivity to rainfall.Considering spatial parameter variability,the safety factor decreases by an average of approximately 1.0%under all rainfall scenarios,while the decrement of reliability index increases significantly from 9.3%to 24.0%after 75 hours of rainfall.After approximately 61 hours,the reliability index incorporating spatial variability begins to fall below that of the unmodified scenario.In stability analysis of high rockfill slopes,reliance on the safety factor alone should be abandoned.Instead,a multidimensional evaluation system integrating the safety factor and reliability index should be adopted.This approach integrates critical factors such as rainfall infiltration and parameter spatial variability to a-chieve more practical and precise risk assessment and engineering decision-making.