关键词: 滑坡稳定性, 失稳复活, Geo-studio软件, 杨家沱滑坡, 三峡库区

Abstract: Reservoir bank landslide is one of the most common and serious natural disasters during the construction of the water conservancy and hydropower engineering. In this paper, the stability and reactivation criterion of Yangjiatuo landslide in the Three Gorges Reservoir area are analyzed. According to the preliminary judgment of GPS monitoring data, the landslide is now in a basically stable state. The stability of Yangjiatuo Landslide is analyzed by using the Geo-studio software under two working conditions, i.e., water level fluctuation and the most adverse reservoir water level fluctuation plus rainfall. The analysis results show that: the safety coefficient increases with increase of the reservoir water level, and decreases with lowering of the reservoir water level, and the landslide belongs to a typical dynamic water pressure type. The most dangerous reservoir water fluctuation condition of the Yangjiatuo landslide is that the reservoir water level decreases at a speed of 3 m/d. The reactivation criterion of Yangjiatuo landslide is that the reservoir water level decreases at the rate of 3 m/d combined with rainfall of up to 358 mm/d, 2 days. The research results can provide some reference for disaster prevention and mitigation of water conservancy and hydropower projects.

Key words: landslide stability, failure and reactivation；Geo-studio software, Yangjiatuo Landslide, Three Gorges Reservoir