Failure transition of shear-to-dilation band of rock salt under triaxial stresses

作     者：Jianfeng Liu Xiaosong Qiu Jianxiong Yang Chao Liang Jingjing Dai Yu Bian Jianfeng Liu;Xiaosong Qiu;Jianxiong Yang;Chao Liang;Jingjing Dai;Yu Bian

作者机构：State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengdu610065China CNPC Key Laboratory of Oil and Gas Underground Storage EngineeringLangfang065007China College of Water Resource and HydropowerSichuan UniversityChengdu610065China 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2024年第16卷第1期

页      面：56-64页

核心收录：

学科分类：08[工学] 0818[工学-地质资源与地质工程] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：This research was financially supported by the Science and Technology Department of Sichuan Province Project,China(Grant Nos.2022YFSY0007,2021YFH0010) the National Scientific Science Foundation of China(Grant No.U20A20266) 

主　　题：Rock salt Cyclic mechanical loading Shear band Dilation band Underground gas storage(UGS) 

摘      要：Great potential of underground gas/energy storage in salt caverns seems to be a promising solution to support renewable *** the underground storage method,the operating cycle unfortunately may reach up to daily or even hourly,which generates complicated pressures on the salt ***,the mechanical behavior of rock salt may change and present distinct failure characteristics under different stress states,which affects the performance of salt cavern during the time period of full *** reproduce a similar loading condition on the cavern surrounding rock mass,the cyclic triaxial loading/unloading tests are performed on the rock salt to explore the mechanical transition behavior and failure characteristics under different *** results show that the rock salt samples pre-sent a diffused shear failure band with significant bulges at certain locations in low confining pressure conditions(e.g.5 MPa,10 MPa and 15 MPa),which is closely related to crystal misorientation and grain boundary *** the elevated confinement(e.g.20 MPa,30 MPa and 40 MPa),the dilation band dominates the failure mechanism,where the large-size halite crystals are crushed to be smaller size and new pores are *** failure transition mechanism revealed in the paper provides additional insight into the mechanical performance of salt caverns influenced by complicated stress states.