锚杆锚索支护的相关知识（Relevant knowledge of bolt and cable support）.docVIP

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锚杆锚索支护的相关知识（Relevant knowledge of bolt and cable support）.doc

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锚杆锚索支护的相关知识（Relevant knowledge of bolt and cable support） Relevant knowledge of bolt and cable support Bolt support technology The principle of bolt support The bolt support is based on the maintenance and utilization of the self-supporting capacity of surrounding rock. It can support and control the deformation and relaxation of surrounding rock in time, and make the surrounding rock become the component part of the supporting system. By anchoring into the internal members of the surrounding rock, change the mechanical state of the surrounding rock of the tunnel, form a whole and stable bearing ring around the roadway, and play a role with the surrounding rock to achieve the purpose of maintaining the roadway. Compared with the traditional shed support, this supporting form belongs to the form of support for the active reinforcement of the roadway surrounding rock. The function of anchor rod in support Suspension effect The anchor anchors the weak rock layer above the firm and stable rock formations. Composite beam action In the roof of a layered rock roadway, a thin layer of rock anchored within the length of the anchor bolt is anchored into a rock composite beam by anchoring a series of bolts, thereby increasing its bearing capacity. Reinforcement of surrounding rock The rock in the deep surrounding rock of the tunnel is in the state of three axis compression, while the rock near the tunnel is in the two axis stress state, and the latter is much less than the former, so it is easy to destroy and lose stability. Around the roadway bolting, some of the rocks and the partial restoration of three axis force increases its strength; in addition the bolt can also increase the rock weak plane shear resistance, the surrounding rock is not easy to damage and instability, the reinforcing effect is called rock. Extrusion connection The bolt will anchor the roadway anchor and exert pre stress on the rock to balance the tensile force generated by the rock to prevent the fractu