The instability of rock slopes and underground engineerings is usually caused by the shear failure of non-persistent joints. Rock bolt, as the main support method, has an important influence on the shear behavior of joints. However, the shear behavior of bolted non-persistent joints has rarely been studied. In this research, direct shear tests were carried out to explore the effect of different bolting schemes on shear behavior of non-persistent joints. The test results showed that fully encapsulated bolts can greatly improve the shear strength of non-persistent joints, while end encapsulated bolts behave better at a larger shear displacement. The bolt breakage is closely related to the shear failure of non-persistent joints. The bolt passing through the coplanar coalescence areas usually has a larger shear deformation and breaks first. The shear displacement of bolt breakage tends to be smaller as the joint persistency decreases. Furthermore, acoustic emission tests showed that the fully encapsulated bolt noticeably reduced the shear damage, while it increased the shear failure intensity. In addition, the bolting effect tends to be smaller under a larger joint persistency.

中文翻译：

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螺栓非持久性接头的剪切行为：螺栓条件和接头持久性的作用

岩石边坡和地下工程的不稳定性通常是由非永久性节理的剪切破坏引起的。锚杆作为主要的支撑方法，对节理的剪切性能有重要影响。但是，很少研究螺栓连接的非永久性接头的剪切行为。在这项研究中，进行了直接剪切试验，以探讨不同锚固方案对非持久节理的剪切行为的影响。测试结果表明，完全密封的螺栓可以大大提高非永久性接头的抗剪强度，而端部密封的螺栓在较大的剪切位移下表现更好。螺栓的断裂与非永久性接头的剪切破坏密切相关。穿过共面聚结区域的螺栓通常具有较大的剪切变形并首先断裂。随着接头持久性的降低，螺栓断裂的剪切位移趋于减小。此外，声发射测试表明，完全封装的螺栓显着降低了剪切损伤，同时增加了剪切破坏强度。另外，在较大的接头持久性下，螺栓连接效果倾向于较小。