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通过一系列剪切模型试验,研究在不同法向力、预应力和锚固情况下锚索对平滑节理面抗剪性能的影响,利用对比试验将销钉力、预应力和轴力增量3种力的抗剪作用分离出来,着重探讨了在剪切过程中3种力对节理面的抗剪贡献,并分析了锚索模拟体的破坏形式。试验结果表明,预应力锚固明显提高了节理面剪切力-位移曲线初始段的抗剪力和剪切刚度,并使得曲线末段表现出塑性强化的特征;预应力大小对加锚节理面抗剪强度的影响与试验条件、节理面状况和锚固角等有关。试验和理论分析表明,剪切位移开始阶段预应力和销钉作用发挥了主要作用,杆体形成塑性铰后轴力增量则起了重要的作用,锚索的破坏一般发生在节理面附近,属于拉剪复合破坏模式。
Through a series of shear model tests, the influence of anchor cable on the shear properties of smooth joints under different normal forces, prestress and anchorage conditions is studied. Three kinds of force of pin force, prestress and axial force increment The shear contribution of three kinds of forces to the joint surface during shearing is emphatically discussed, and the failure forms of the simulated body of the cable are analyzed. The experimental results show that the prestressed anchorage significantly increases the shear and shear stiffness of the initial section of the shear-displacement curve of the joint surface and makes the last section of the curve show the characteristics of plastic strengthening. The influence of shear strength is related to the test conditions, the condition of joint surface and the anchorage angle. The experimental and theoretical analysis shows that the prestressing and pinning play an important role in the initial stage of shear displacement, and the axial force increment of the plastic hinge plays an important role. The failure of the anchor cable usually occurs near the joint surface, Shear compound destruction mode.