| Reservoir bank landslide is a majoir geological disaster in Jiudianxia Reservoir, and the water level is increasing constantly during, the period of impoundment with the water level constantly fluctuating. As the reservoir storing water, the hydrogeological conditions of Jiudianxia Reservoir along the coast change greatly, which lead to the bank landslide stability changing significantly, with the water level fluctuation being another crucial factor on affecting the landslide stability as well. The reservoir bank landslide may stimulate and aggravate landslide slip deformation, especially the landslide threating the Jiudianxia Dam and the life and property safety of downstream residents. It is great significance for prediction and prevention on the impoundment of reservoir banks of slope instability by studying the law of the reservoir landslide stability during the impoundment in Jiudianxia Reservoir.The Yanziping landslide is around 960 m from the Jiudianxia Dam, which belongs to a typical reservoir landslide. During the period of impoundment, the landslide surface and the artificial excavation road located in the middle part show cracking and subsidence deformation phenomenon with local sliding. Through studying the typical slope (Yanziping Landslide), it was monitored by using GPS for the external deformation by Jiudianxia Company. According to analyzing the law of slope’s change, it was quantitatively analyzed the influence on landslide stability by the impoundment combined with the fluctuation of water level and the rate of water rise.Firstly, it analyzes the geological environment and makes the geological disaster partition in the study area. Further, it is monitered by using the GPS in the process of impounment on the landslide stability, briefly discussed the monitoring principle and layout scheme, and selecting two factors as a major research object including the water storge rate and water level in order to study the regular of landslide stability affected by impoundment. Finally, qualitative analysis is necessery on reservoir bank landslide instability mechanism in the process of the impoudment, using the slope entropy and the numerical simulation method to verify the influence law of above analysis, and put forward measures to prevent and control Yanziping Landslide to ensure the normal order of the Jiudianxia Reservoir operation. |
