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预应力全长锚固锚杆抗剪作用分析

Analysis of Shear Resisting Action of Full-length Anchored Bolt with Pre-stress

  • 摘要: 通过有限差分软件FLAC3D模拟计算了预应力全长锚固锚杆抗剪作用,着重探讨了围岩强度、锚杆以及预紧力对节理面抗剪性能的影响。模拟结果得出:节理的抗剪性能受到围岩强度的显著影响;加锚节理的抗剪性能由于锚杆与围岩组成的系统抗剪刚度提高,使得节理的抗剪强度提高;预紧力的施加一方面提高了支护系统的刚度,另一方面使得锚杆轴向力相对于节理面法向分量增加,提高了节理的抗剪性能。

     

    Abstract: Applying FLAC3D to simulating shear resisting action of full-length anchored bolt with pre-stress, influence of surrounding rock strength, anchored bolt and pre-stress on shear resisting performance of joint was discussed. Simulation results were showed as follows. Shear resisting performance was influenced by surrounding rock strength largely. Increase of shear resisting stiffness of system composed by anchored bolt and surrounding rock would improve shear resisting strength of joint. Pre-stress not only improved stiffness of supporting system, but also made axial force of anchored bolt increase, so it improved shear resisting performance.

     

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