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| Experimental study on shear characteristics of bolted rock joints under constant normal stiffness boundary conditions |
| JIANG Yujing1，2，3，ZHANG Sunhao1，2，LUAN Hengjie1，2，WANG Changsheng1，2，3，WEN Zhijie1，2，WANG Dong1，2，HAN Wei3 |
(1. College of Energy and Mining Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；
2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；3. Graduate School of Engineering，Nagasaki University，Nagasaki 852–8521，Japan) |
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Abstract Understanding the shear behavior of bolted rock joints is crucial to designing of geotechnical projects that include discontinuities. The effects of constant normal stiffness(CNS) boundary conditions on shear characteristics of bolted rock joints were investigated through shear tests on bolted rock joints and non-bolted rock joints under different CNS boundary conditions. The results show that，at the pre peak stage，the effect of the normal stiffness on the first peak value of the shear stress(Tp) is not obvious. At the post peak stage， the shear stress-shear displacement curve respectively shows displacement softening characteristic，stability characteristic，and displacement hardening characteristic when the normal stiffness is less than 3 GPa/m，equal to 3 GPa/m and equal to 5 GPa/m, and the shear stress of bolt broken(Tf) increases significantly with increasing the normal stiffness. At the bolt broken stage，the shear stress-shear displacement shows step subsidence. The Tp and Tf of bolted joints are both higher than those of non-bolted joints. When the normal stiffness exceeds 3 GPa/m，the shear strength loss caused by joint wear can be counteracted by bolting. The first peak value increment of the shear stress(T1) increases with increasing the normal stiffness and JRC，while the shear stress increment of bolt broken(T2) decreases with increasing the normal stiffness and increases with increasing JRC. The failure range of the joint surface increases with increasing the normal stiffness，and the elliptical failure range of the bolt hole wall decreases with increasing the normal stiffness. The deformation of the bolt shows a shape of“Z”after shearing，and the failure mode of the bolt changes from tensile failure to bending failure and then to shear failure as the normal stiffness increases. The breaking shear displacement of the bolt tends to increase as the normal stiffness ranging from 0 to 1 GPa/m and decreases continuously as the normal stiffness varying from 1 to 5 GPa/m.
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2021, Vol. 40 
