关键词: 库水位升降, 非饱和流固耦合, 滑坡复活, 机理

Abstract:

Shuping Landslide, located in Three Gorges reservoir area, is in dynamic saturated or unsaturated state due to the periodical water level fluctuation of the reservoir. Therefore, based on the finite element equations coupled with the saturated-unsaturated seepage field and stress field, the revival mechanism of Shuping Landslide under the periodical water level fluctuation with different variation rate was researched by using the FEM strength reduction method. The result indicates that the fluctuation of ground water level in the landslide has a hysteretic nature, and is closely related with the permeability of slide body; when the water level rises, the stability coefficient of landslide increases first and decreases then, and the coefficient increases with the rising rate of water level; when the water level falls, the coefficient decreases first and increases later, and the coefficient decreases with the falling rate of water level; the critical water level change speed for Shuping Landslide revival is 2 m/d, and the critical fluctuation level is about falling to 165 m.

Key words: reservoir water level fluctuation, unsaturated seepage-solid coupling, landslide revival, mechanism