Study on Deformation and Failure of Toppling Deformation Slope of Miaowei Hydropower Station under Storage Condition

Abstract

With the completion and operation of hydropower stations in Southwest China, the stability of reservoir slope is impacted by the change of water level during reservoir storage and operation. It has become an important engineering geological problem in the design and operation of hydropower stations. Taking the Miao River Hydropower Station in Lancing River Basin as the research object, the structural characteristics of the bank slope and the influence of reservoir impoundment are analyzed. The deformation of the slope rock mass in the reservoir area is serious. During the reservoir storage, the stability of the bank slope is outstanding. In order to analyze the influence of the change of water level on the stability and failure mode of the tilting deformable body on the bank slope under the condition of water storage, through the numerical simulation analysis, using UDEC discrete element software after impoundment, it is concluded that after water storage, the strength of rock mass is reduced, and the failure mode changes from sliding failure to collapse and failure, but the stress field of the slope has little change.