某水库滑坡在降雨作用下的稳定性模拟分析

Simulation Analysis of Reservoir Landslide Stability under Rainfall Condition

水库型滑坡主要受库水位升降变化而发生变形,因此对水库滑坡的研究主要集中在库水变动影响下的滑坡变形机理及稳定性分析方面.然而通过对三峡库区滑坡调查发现,有一类水库滑坡变形主要受降雨影响,而研究这类滑坡在降雨和库水共同作用下的变形及稳定性同样具有重要意义.本文以三峡库区某水库滑坡为例,在详细调查该滑坡地质条件及变形发展过程基础上,运用数值模拟方法对其渗流场及稳定性进行了定量分析.结果表明,该滑坡由于特殊的地形条件,其变形主要受降雨影响,受库水位升降影响较小.

The deformation of reservoir landslide is mainly affected by water level changes; so the study of reservoir landslide mainly focuses on the mechanism of landslide deformation and stability analysis under the influence of reservoir water level changes. However, by investigating the landslide in Three Gorges area we found that there is a certain type of reservoir landslide whose deformation is mainly influenced by rainfall; so researching the deformation and stability of this type under the influence of both rainfall and reservoir water level change will be of great importance. Taking a reservoir landslide in Three Gorges area for example, using numerical simulation method to analyze the seepage field and stability quantitatively based on detailed investi- gations of the geology and deformation process of the landslide. The results indicate that the landslide clue to the special topographical conditions, the deformation is mainly affected by rainfall, less affected by the reser- voir water level fluctuation.