Deformation and failure mechanism of Yanjiao rock slope influenced by rainfall and water level fluctuation of the Xiluodu hydropower station reservoir

作     者：Wang Neng-feng He Jian-xian DU Xiao-xiang Cai Bin Zhao Jian-jun WANG Neng-feng;HE Jian-xian;DU Xiao-xiang;CAI Bin;ZHAO Jian-jun

作者机构：POWERCHINA Chengdu Engineering Corporation LimitedChengdu610072China School of Civil EngineeringSouthwest Jiaotong UniversityChengdu610031China State Key Laboratory of Geohazard Prevention and Geoenvironment ProtectionChengdu University of TechnologyChengdu610059China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2023年第20卷第1期

页      面：1-14页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0815[工学-水利工程] 081503[工学-水工结构工程] 

基　　金：the project of POWERCHINA Chengdu Engineering Corporation Limited,Power China under Grant No.P46220 the Natural Science Foundation of Sichuan,China under Grant No.2022NSFSC0425 the Science and Technology Department of Sichuan Province under Grant No.2021YJ0053 

主　　题：Reservoir rock slope Rainfall Reservoir water level fluctuation Deformation characteristics Slope failure mechanism 

摘      要：With the construction of the Xiluodu hydropower station on the Jinsha River,the reservoir impoundment began in 2013 and the water level fluctuates annually between 540 m and 600 m above sea *** Yanjiao rock slope which is located on the left bank of the Jinsha River 75 km upstream of the Xiluodu dam site,began to deform in *** potential failure of the slope not only threatens Yanjiao town but also affects the safe operation of the Xiluodu *** paper is to find the factors influencing the Yanjiao slope deformation through field investigation,geotechnical reconnaissance,and *** show that the Yanjiao slope can be divided into a bank collapse area(BCA)and a strong deformation area(SDA)based on the crack distribution characteristics of the *** rear area of the slope has been experiencing persistent deformation with a maximum cumulative displacement(GPS monitoring point G4)of 505 mm and 399 mm in the horizontal and vertical directions,*** potential failure surface of the slope is formed 36 m below the surface based on the borehole *** bank collapses of the Yanjiao slope are directly caused by the reservoir impoundment while the deformation area of the slope is affected by the combination of the rainfall and reservoir water level *** on mechanism of the Yanjiao slope,prestressed anchor combined with the surface drainage and slope unloading are recommended to prevent potential deformation.