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以某矿保护层开采为实例,根据C5、C12保护层与被保护层C8煤层的位置关系及巷道布置情况,提出了以残余瓦斯含量和钻屑指标K1值2个指标对保护范围进行考察。从最大保护垂距、走向、倾向3个方面对保护范围分析得出:走向卸压角为60°;C5对C8倾斜上下卸压角分别为70°和77°,C12对C8倾斜上下卸压角分别为69°和90°。运用FLAC3D软件对C12煤层留设的2#和12#上山煤柱影响范围进行模拟,模拟结果表明煤柱影响存在扩界效应。根据卸压角对煤柱扩界区域进行确定,在此基础上对1801和1802工作面进行区域划分。同时采取有效防突和效果检验措施,区域瓦斯抽放率达到了30%以上,预测及效检指标均不超限,实现了安全回采。
Taking the mining of a mine protective layer as an example, according to the position relationship of C5 and C12 protective layer and the protective seam C8 coal seam and the layout of the roadway, the protective range was proposed based on the residual gas content and K1 value of the drill cuttings index. From the maximum protection of the vertical distance, direction, tendency analysis of the protection of the scope of the three drawn: to the pressure relief angle of 60 °; C5 on the C8 tilt relief pressure up and down, respectively, 70 ° and 77 °, C12 on the C8 tilt up and down the pressure relief The angles are 69 ° and 90 °, respectively. The FLAC3D software is used to simulate the influence range of 2 # and 12 # uphill pillars left in C12 coal seam. The simulation results show that there is an expanding effect in coal pillar. According to the pressure relief angle to determine the expansion of coal pillar area, on this basis 1801 and 1802 face division. At the same time, effective measures against outburst and effect are adopted, and the gas drainage rate in the area reaches over 30%. The predicted and effective indexes do not exceed the limits and the safe recovery is achieved.