Study On Stability And Supporting Measures Of The Spillway ? Outlet Slope On The Right Bank Of Kajiwa Hydropower Station

Kajiwa hydropower station is located on the Muli river,Sichuan Province.It is the second one of six planed hydropower stations.The retaining structure is a concrete faced rockfill dam,with a height of 171 meters.,which is in top 10 highest similar type of dam in China.It is of great significance to analyze the stability of stability and supporting measures of engineering slopes of Kajiwa Hydropower Station.Based on the analysis of the basic geological condition of the engineering area,the stability of the outlet slope of the spillway tunnel and the supporting design are studied from the following aspects.(1)Based on the analysis and study of the basic geological data,the reasonable selection and analysis of the reliability parameters are carried out.According to the geologic and terrain conditions of the outlet slope of the right bank No.2 spillway tunnel,detailed simulation of the slide belt and slide body are conducted to meet the engineering design needs of the calculation model.(2)According to the two-dimensional limit equilibrium analysis method,the stability of the slope is analyzed and calculated under the present,construction,and reinforcement condition of the slope.The possible instability range and onstruction sequence of the slope are determined.(3)The three-dimensional stress-deformation analysis method(FLAC3D)is used to simulate the excavation and reinforcement of the outlet slope.The excavation slope is discussed according to the stress field,deformation field and plastic zone.The possible destabilization range and instability zone are studied,and the reinforcement treatment scheme and construction sequence are put forward,and the stability evaluation is made.(4)According to the stability and geologic conditions of the outlet slope of the spillway tunnel,consideration should be given to the selection of pre-stressed anchor cable reinforcement,anti-slide pile reinforcement,anti-slide pile + prestressed anchor reinforcement and so on.Design calculation,fully analyze and evaluate the effect of various reinforcement schemes,optimization of the reinforcement program and put forward corresponding construction procedure.