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依据某煤矿的地质条件,对该矿轨道上山的底臌现象进行了数值模拟研究,并对采用巷道底板切槽、两帮切槽进行卸压条件下的围岩应力分布和底板岩层位移进行了分析。卸压法可以使巷道在开挖时就处于相对的低应力区,从而保护围岩的完整性,为后期巷道的支护加固创造有利条件。底板开槽时,开槽深度对卸压效果有明显的影响。模拟结果表明,开槽深度为底板宽度的60%左右时,卸压效果最好且开槽的工程量最少。
According to the geological conditions of a coal mine, the phenomenon of bottom 臌 uphill of the ore track is numerically simulated and the stress distribution of surrounding rock and the displacement of floor rock under the conditions of pressure relief by using floor slab, analysis. The pressure relief method can make the roadway relatively low-stress area during excavation, thus protecting the integrity of the surrounding rock and creating favorable conditions for the support and reinforcement of the roadway in the later stage. When the floor is grooved, the groove depth has a significant effect on the pressure relief effect. The simulation results show that when the depth of the groove is about 60% of the width of the floor, the relief effect is the best and the amount of the grooved works is the least.