Shear behaviour of a rock bridge sandwiched between incipient joints under the influence of hydraulic pressures

作     者：Shicheng Wang Xuxu Yang Lichao Li Panpan Sun Lei Yang Fuwei Li Shicheng Wang;Xuxu Yang;Lichao Li;Panpan Sun;Lei Yang;Fuwei Li

作者机构：Shandong Key Laboratory of Civil Engineering Disaster Prevention and MitigationShandong University of Science and TechnologyQingdao 266590China School of Civil Engineering and ArchitectureShandong University of Science and TechnologyQingdao 266590China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2023年第33卷第2期

页      面：233-242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] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the National Natural Science Foundation of China(No.51704183) the Postdoctoral Science Foundation of China(No.2018M640646) 

主　　题：Direct shear tests Hydraulic pressure Rock bridge Failure mechanism Hydraulic pressure lag Rock joints 

摘      要：The rock bridges sandwiched in incipiently jointed rock mass were considered as barriers that block the fluid seepage,and provide certain shear strength *** better revealing the influence of hydraulic pressure on the failure behaviour of rock bridges,direct shear tests were carried out through a newly proposed method on rock samples that contain two parallel incipient *** developing the gypsum-silicone pad coupling samples,a conventional triaxial test system was qualified to implement direct shear tests with satisfied sealing *** results showed that the rock bridges could be failed through the tensile failure,shear failure and mixed failure *** hydraulic pressure would facilitate the tensile failure mechanism and induce rougher fracture surfaces;while the normal stress would facilitate the shear failure mechanism and induce less rough *** hydraulic pressure reduced the global shear strength of the rock block through reducing the efficient normal stress applied on the rock bridge area,which was highly dependent on the joint persistence,***,because of the iterating occurrence of the hydraulic pressure lag with the fracture propagation,the rock bridge failure stage in the shear stress-shear displacement curves displayed a fluctuation trend.