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为了保证被保护层瓦斯的消突和治理工作,掌握保护层开采的卸压效果和预测卸压瓦斯的主要分布区域,运用UDEC离散元模拟得到了下保护层开采后被保护层的卸压效果、瓦斯运移规律及分布情况,并根据模拟结果相应地提出了留巷钻孔法抽采卸压瓦斯,实现了无煤柱开采,消除了被保护层应力集中区煤与瓦斯突出危险威胁。经现场实测抽采后3号煤层瓦斯压力降低了1.36 MPa,瓦斯含量降低了9.51 MPa,抽采效果良好。
In order to ensure the gas outburst in the protected layer and harnessing work, grasp the pressure relief effect of the protective layer mining and predict the main distribution area of the pressure relief gas, the relief effect of the protective layer after mining the lower protective layer is obtained by UDEC discrete element simulation , Gas migration regularity and distribution, and according to the simulation results, the gas drainage by underground drilling was put forward to relieve the danger of coal and gas outburst in the stress concentration area of the protected area. After the field test, the gas pressure of No. 3 coal seam has been reduced by 1.36 MPa and the gas content has been reduced by 9.51 MPa. The pumping effect is good.