首页|Shear behaviour of a rock bridge sandwiched between incipient joints under the influence of hydraulic pressures
Shear behaviour of a rock bridge sandwiched between incipient joints under the influence of hydraulic pressures
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
The rock bridges sandwiched in incipiently jointed rock mass were considered as barriers that block the fluid seepage,and provide certain shear strength reservation.For 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 joints.By developing the gypsum-silicone pad coupling samples,a conventional triaxial test system was qualified to imple-ment direct shear tests with satisfied sealing capability.The results showed that the rock bridges could be failed through the tensile failure,shear failure and mixed failure mechanism.The 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 fracture.The hydraulic pres-sure 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,k.Moreover,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.
Direct shear testsHydraulic pressureRock bridgeFailure mechanismHydraulic pressure lagRock joints
Shicheng Wang、Xuxu Yang、Lichao Li、Panpan Sun、Lei Yang、Fuwei Li
展开 >
Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China
School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China
National Natural Science Foundation of ChinaPostdoctoral Science Foundation of China
万方数据
维普
