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为研究弱胶结软岩巷道支护难题,以塔然高勒矿区某矿弱胶结软岩巷道支护工程为研究对象,通过现场调研和室内试验分析弱胶结软岩遇水软化机理。利用有限元分析软件MIDAS/GTS建立弱胶结软岩巷道弹塑性数值计算模型,对比分析锚网喷和锚网喷架两种支护方案时的巷道塑性区范围、应力分布、表面位移、喷混结构受力及锚杆和钢支架的受力形态。进行现场工业试验,监测巷道围岩收敛变形和锚杆受力变化情况。结果表明,锚网喷架支护形式能够确保支护体系充分发挥作用,塑性区范围小,围岩应力分布均匀、锚喷支护结构受力均匀且较锚网喷支护时小,采用钢支架与锚网喷构成支护体系会大大提高支护结构整体刚度,提升围岩的自稳能力和自承能力。
In order to study the problem of weak cementing soft rock roadway supporting, the weak cementing soft rock roadway supporting project in a mine in Tarun Goller mining area is taken as the research object. The weak softening soft rock is treated by water and softening mechanism through field investigation and laboratory test. The finite element analysis software MIDAS / GTS is used to establish the elasto-plastic numerical model of weak cement soft roadway. The plastic zone range, stress distribution, surface displacement, spray mixing Structural stress and anchor bolt and steel stent force morphology. Field industrial tests were carried out to monitor the surrounding rock deformation and deformation of the roadway and the change of the bolt force. The results show that the support pattern of the bolting frame can ensure the full support of the supporting system, the plastic zone has a small area and the stress distribution of the surrounding rock is uniform. The supporting structure of the bolting and shotcrete is uniformly stressed and smaller than the bolting and bolting support, Bracket and anchor net spray supporting system will greatly improve the overall support structure stiffness, improve self-stability of surrounding rock and self-supporting capacity.