Theoretical study on stability evolution of soft and hard interbedded bedding reservoir slopes

作     者：WU Qiong ZHANG Bo TANG Hui-ming WANG di LIU Zhi-qi LIN Zhi-wei WU Qiong;ZHANG Bo;TANG Hui-ming;WANG di;LIU Zhi-qi;LIN Zhi-wei

作者机构：Faculty of EngineeringChina University of GeosciencesWuhan 430074China 

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

年 卷 期：2023年第20卷第9期

页      面：2744-2755页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 081503[工学-水工结构工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Project No.42377182 and 42090054) the National Key R&D Program of China(No.2022YFC3080200) 

主　　题：Soft and hard interbedded rock slope Limit equilibrium method Spatial variation Wetting and drying cycles Plane failure Stability evolution 

摘      要：Soft and hard interbedded bedding rock slopes,which is prone to failure,are widely distributed in the Three Gorges Reservoir,*** equilibrium method(LEM)is commonly used to analyze the stability of bedding rock slopes that have a single failure ***,this method cannot accurately estimate the stability of soft and hard interbedded bedding reservoir slopes because the strength parameters of a soft and hard interbedded rock mass vary spatially along the bedding plane and deteriorate with time due to periodic fluctuations of reservoir level.A modified LEM is proposed to evaluate the stability evolution of soft and hard interbedded bedding reservoir slopes considering the spatial variation and temporal deterioration of shear strength parameters of rock masses and bedding *** the modified LEM,the S-curve model is used to define the spatial variation of shear strength parameters,and general deterioration equations of shear strength parameters with the increasing number of wettingdrying cycles(WDC)are proposed to describe the temporal ***,this method is applied to evaluate the stability evolution of a soft and hard interbedded bedding reservoir slope,located at the Three Gorges *** results show that neglecting the spatial variation and temporal deterioration of shear strength parameters may overestimate slope ***,the modified LEM provides useful guidance to reasonably evaluate the long-term stability of soft and hard interbedded bedding reservoir slopes in reservoir area.