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为了提高巷道围岩锚固体的强度、刚度和抗变形能力,基于锚杆(索)锚固作用机理,提出了“高预紧力、高强度、高刚度、高锚固力和低密度”的设计理念。采用高强锚杆(索)及组合构件作为锚固材料,利用连锁构件将锚杆(索)群进行横向与纵向的连锁,通过给锚杆(索)提供高锚固力和高预应力,从本质上调动锚杆(索)群的主动锚固作用,使其与锚固岩体共同形成有机的承载结构,有效减小巷道围岩变形与破坏,改善巷道安全状况。现场试验表明,这样的设计理念和技术应用,能够较好地解决巷道围岩顶板断裂节理发育、变形不均匀和掘进速度慢等问题,具有合理性与适用性,同时可产生良好的经济效益,值得应用和推广。
In order to improve the strength, stiffness and deformation resistance of surrounding rock anchors in roadway, based on the mechanism of anchor (cable) anchorage, “high preload, high strength, high rigidity, high anchorage force and low density” design concept. The use of high-strength anchor (cable) and the combination of components as anchoring materials, the use of interlocking members of the anchor (cable) group horizontal and vertical chain, by providing anchor (cable) to provide high anchorage force and high prestress, essentially Mobilize the active anchoring effect of the anchor (cable) group to form an organic bearing structure together with the anchoring rock mass, effectively reducing the deformation and damage of the surrounding rock of the roadway and improving the safety of the roadway. Field tests show that the design concept and application of technology can well solve the problems such as the development of fracture joints, uneven deformation and slow tunneling speed of surrounding rock of roadway, which has the advantages of rationality and applicability, as well as good economic benefits, Worthy of application and promotion.