Abstract:Focused on the large-scale landslide hazards in the Three Gorges Project(TGP) reservoir area,coupling mechanism of the endogenic and exogenic geological processes of geological hazard is studied. The following three aspects are examined. (1) By analysing the landslide space-time distribution characters and its control factors,the relations between the landslide formation and the Earth¢s endogenic-exogenic geological processes are illustrated. (2) Slipping zones are the control factor of rock slide development. Based on the study of sedimentary formation,tectonic evolution and earth¢s exogenic geological process,four-phase patterns of slipping zone formation and evolution are put forward;and the coupling mechanism of the Earth¢s endogenic-exogenic geological processes is explained. (3) Qianjiangping Landslide is the first rock slide after impounding of TGP. Through the fine description and test on the slipping zone and interbedded shear zone,slipping zone formation process of Qianjiangping Landslide is rebuilt. The effect of the endogenic-exogenic geological processes on slipping zone formation is studied. The conclusions are shown as follows:(1) the coupling of neotectonic movement(intense tectonic up and river downcutting) and Quaternary climatic change(intense rainfall) is the main dynamic factor of many large-scale landslides development in TGP reservoir area;(2) the coupling of interbedded shear effect and water-rock interaction is the control factor of slipping zone formation in rock sliding;and (3) it is of great importance to study the neonatal landslide in TGP reservoir area. The geomechanical study on interbedded shear zone in easy-slipping strata is helpful to discover and forecast neonatal landslides.