不同降雨入渗条件下滑坡稳定性数值模拟研究

Numerical Simulation Study of Slope Stability under Different Rainfall Infiltration Conditions

摘要: 为系统揭示降雨条件下滑坡体内部渗流场演化特征及其对边坡整体稳定性的影响机制，以某滑坡2-2剖面为研究对象，基于GeoStudio软件平台，构建二维滑坡数值模型，分别模拟连绵细雨与暴雨两种典型降雨工况下滑坡体孔隙水压力、总水头分布及安全系数的时变响应规律。研究结果表明：降雨入渗显著改变滑坡体内部瞬态渗流场分布特征，导致孔隙水压力逐步累积并引起安全系数下降；在连绵细雨工况下，渗流影响主要局限于滑体表层，对整体稳定性影响有限，而暴雨工况下滑坡体迅速进入低安全系数状态，存在明显失稳风险。研究成果可为类似降雨诱发滑坡的稳定性评价及灾害防治提供定量参考。

Abstract: To systematically reveal the evolution characteristics of the internal seepage field within a landslide body under rainfall conditions and its influence mechanism on the overall slope stability, a two-dimensional numerical model of the landslide was constructed using the GeoStudio software platform, taking the 2-2 profile of a specific landslide as the study object. The model simulated the time-varying response patterns of pore water pressure, total hydraulic head distribution, and safety factor under two typical rainfall scenarios: continuous light rain and heavy rain. Results indicate that rainfall infiltration significantly alters the transient seepage field distribution within the landslide body, leading to gradual accumulation of pore water pressure and a corresponding decrease in the safety factor. Under steady drizzle conditions, seepage effects are primarily confined to the surface layer of the landslide body, exerting limited influence on overall stability. In contrast, under torrential rain conditions, the landslide body rapidly enters a state of low safety factor, presenting a significant risk of instability. These findings provide quantitative references for stability assessment and disaster prevention of rainfall-induced landslides.