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根据大采高工作面回采巷道帮部围岩的特点,采用断裂损伤理论、弹塑性理论建立了巷帮围岩层裂板结构力学模型,分析了霍州煤电辛置煤矿回采巷道帮部围岩失稳机制,并将注浆锚索支护方式首次应用于巷道帮部围岩的片帮治理。研究表明:回采巷道帮部围岩内部存在大量的裂纹,在高应力的作用下裂纹扩展发育,巷帮围岩演化为层裂板结构,当作用在巷帮围岩上的多重支承压力大于最小临界失稳载荷时即发生片帮;随煤岩体弹性模量、层裂板厚度的增大,层裂板发生失稳时破坏范围扩大;采用注浆锚索支护巷帮时浆液能够填满巷帮围岩深部裂隙,使巷帮围岩成为一个整体,提高了巷帮围岩支护结构的承载能力,控制了巷帮围岩片帮的发生。
According to the characteristics of surrounding rocks in coal mining roadway with big mining face, the fracture mechanics model of rock mass in surrounding rock is established by fracture damage theory and elasto-plastic theory. Rock instability mechanism, and the grouting anchor cable support method for the first time applied to the gangway surrounding rocks of the film to help governance. The results show that there are a large number of cracks in the surrounding rock of the roadway gangway, and the crack propagation develops under the action of high stress. The surrounding rock of the laneway evolves into a delaminated structure. When the multiple support pressure acting on the rock mass surrounding the laneway is greater than minimum When the critical instability load is applied, the slab can be formed. With the increase of the elastic modulus of the rock mass and the thickness of the delaminated plate, the failure range of the delaminated plate enlarges when the instability of the delaminated plate occurs. Full alley to help the surrounding rock deep cracks, so that alley rock as a whole to improve the alley to support the surrounding rock bearing capacity, control the alluvial rock to help the occurrence.