Analysis on influencing factors of deformation and failure of Zengjiapeng landslide in Three Gorges Reservoir area

After the happening of Qianjiangping landslide,the overall landslide at Zengjiapeng occurred,which was the second largest landslide in the Three Gorges Reservoir area since the reservoir impoundment. By the correlation analysis on deformation rate of landslide,reservoir level and rainfall,the author establishes the responding relationship between deformation of landslide and external dynamic influencing factors,also analyzes the major causes and deformation mechanism of the landslide. The analysis results show that the rainstorm or long- term rain,and high water saturation at the first time are all the main factors causing deformation; however the reservoir level rising,even sudden rising and slow drawdown,has littlie impact on the landslide. Zengjiapeng landslide finally deformed and failed under the coupling of rainstorm and operation at a high reservoir level.