基于GIS的降雨滑坡渗流–稳定实时评价方法研究

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。

GIS-based real-time assessment method of infiltration-stability of rainfall-induced landslide

The rainfall is one of the main factors to induce landslides.The percolation process of the rainfall in the landslide mass is described.Some factors are taken into consideration,including change of wetting characteristics of soils,development tendency of the wetting front and transformation between the infiltrated rainfall amount and the groundwater level.The classical Green-Ampt model is coupled with 3D limit equilibrium model,which assumes infiltration area to be saturated and consideres arbitrary rainfall intensity.A real-time evaluation model for infiltration-stability is established based on grid data format of GIS.It can quantitatively assess stability of landslide by the location of the sliding surface.Finally,there are some examples to validate that the proposed method can be employed to assess and analyze the stability of a single landslide.