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Macro and micro failure mechanism and damage model of bolted rock joints

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Document pages: 15 pages

Abstract: The anchoring mechanism of bolted connections under shear load is studied by using bilinear constitutive model and fish language embedded in particle flow program based on discrete element method. By changing the inclination angle of the bolt, the influence of the anchorage system on the macro micro mechanical response is studied. The results show that there is a clear relationship between the mechanical response of rock joints and the mechanical properties of anchorage angle. By optimizing the anchorage angle, the peak strength can be increased by nearly 50 compared with 90 ° anchorage angle. The optimum anchoring angle range is 45 ° ~ 75 °. The damage mechanism of the best anchorage angle joint is revealed from the perspective of macro mechanics The concentration of the contact force between disks will appear in the joint and around the bolt, resulting in crack initiation. These cracks are mainly tensile cracks, which are consistent with the formation mechanism for compression-induced tensile cracks. Therefore, the macroscopic peak shear stress in the joint and the microscopic damage to the anchoring system should be considered when determining the optimal anchoring angle to reinforce a jointed rock mass.

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