门克庆矿2201回风巷顶板破坏机理与支护研究

Study on roof failure mechanism and support of 2201 return airway in Menkeqing Coal Mine

针对门克庆煤矿11-2201工作面回风巷700m开始间断性顶板下沉的问题,通过顶板钻孔窥视、深基点监测等现场试验研究了顶板围岩破坏特征;理论分析了水对围岩力学参数的影响、泥质夹层对顶板围岩破坏失稳的作用,并利用数值模拟软件FLAC3 D研究了巷道淋水与干燥区间开挖后塑性破坏规律。得出大埋深高应力下围岩含水软化及顶板夹层失稳是导致顶板下沉的关键因素,基于此提出本巷道分段补强支护建议,确保巷道服务期间的安全使用。

Aiming at the condition of return airway roof convergence at 700m in Menkeqing Coal Mine, roof failure characteristics of surrounding rock was studied by the borehole peering and deep base point monitoring; the influence of water on rock mechanics parameters and the unstability of the argillaceous interlayer damage to roof rock mass was made certain by the theoretical analysis, numerical simulation software FLAC^3D was used to study the rule of destruction plastic after the roadway excavated between wet and dry section. Based on this, we put forward that under the condition of big buried deep under high stress the water softening of surrounding rock and roof sandwich instability is the key factor of roof convergence. Based on the above research, roadway section reinforcing supporting advice was proposed to ensure the roadway safety during service.