论文部分内容阅读
为保障被保护层1781(3)工作面的安全回采,基于保护层开采理论,借助于3DEC有限差分软件模拟下保护层工作面回采对被保护层的影响,得出:基于卸压区域整体呈明显的对称形态,卸压高度范围超过被保护层的顶板区域,倾向卸压角范围为102.28°~112.6°,走向卸压角范围为99.31°~100.09°;同时,为获取保护层沿走向的合理超前距,针对被保护层1761(3)工作面瓦斯动力参数进行现场实测,得到:被保护层的始采线与停采线应以保护层始采线和停采线内退一定距离,被保护层充分卸压点位于保护层工作面后方20~120 m范围。基于上述的结论,确立布置底板穿层钻孔对1781(3)工作面进行瓦斯抽采,并对保护区域进行抽采效果验证,瓦斯抽采率达到62.9%。
In order to ensure the safe recovery of the working face 1781 (3) of the protected layer, based on the theory of protective layer mining, the influence of back mining on the protective layer working face to the protected layer was simulated by means of 3DEC finite difference software. Obvious symmetrical shape, the range of pressure relief exceeds the roof area of the protected layer, the tendency of pressure relief angle range is 102.28 ° ~ 112.6 °, the direction of pressure relief angle is 99.31 ° ~ 100.09 °; at the same time, in order to obtain the protective layer along the strike Reasonable leading distance, for the protected layer 1761 (3) face dynamic parameters measured on-site, we get: the beginning of the protective layer of the mining line and stop the line should be the beginning of the protective layer mining line and stop line back within a certain distance was The protective layer is fully pressure relief point located in the protective layer 20 ~ 120m behind the working area. Based on the above conclusions, it is established that the drilling of the floor through the layer is established and the gas drainage is carried out on the 1781 (3) face, and the extraction effect of the protected area is verified. The gas drainage rate reaches 62.9%.