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降雨是诱发滑坡灾害的主要因素之一。阐述了不同降雨强度下的雨水在边坡体中的渗透过程,其中考虑了不同降雨强度下的土壤入渗能力变化、降雨入渗量及降雨入渗前锋界面与地下水位的转化关系。将经典的Green-Ampt模型与三维极限平衡模型耦合,假定入渗区域饱和,并考虑任意降雨强度,建立了基于GIS栅格数据格式的降雨渗透-稳定实时评价模型,来定量评价斜坡体的实时稳定状态。通过模型算法和例题分析验证了本文所提方法可对单体滑坡进行实时稳定性分析。
Rainfall is one of the major causes of landslide disasters. The infiltration process of rainwater in slope body under different rainfall intensities is expounded. The change of soil infiltration capacity under different rainfall intensities, the infiltration capacity of rainfall and the conversion of rainfall infiltration front interface and groundwater level are considered. Coupling the classical Green-Ampt model with the three-dimensional limit equilibrium model, assuming that the infiltration area is saturated and taking into account any rainfall intensity, a real-time rainfall infiltration-stability assessment model based on GIS grid data format is established to quantitatively evaluate the real-time stable state. Through the model algorithm and the example analysis, it is verified that the method proposed in this paper can analyze the real-time stability of a single landslide.