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Methane moving law with long gas extraction holes in goaf

机译：甲烷移动法，采用长气萃取孔

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In order to grasp the methane moving law in goaf and provide a theoretical data for gas extraction holes, the height of caving and fractured zones in the stope has been calculated according to the experiential formula and gas movement law has been observed by field and laboratory experiment. It also gives gas moving characteristics with different position of extraction holes. And it has the best gas extraction result when the final holes are arranged around 30 m above the coal seam and 10-20 m away from the tailentry in horizontal direction. Besides, the height of final holes should be adjusted to the overburden strata structure. When final holes are near the tailentry, their height should be controlled in the upper of regular caving zone; when they are close to the center of face, their height should be controlled at the bottom of fracture zones.
机译：为了把甲烷在甲烷的移动法中掌握并提供气体提取孔的理论数据，根据现场和实验室实验观察到的经验公式和气体运动法，计算了洞穴中的高度和裂缝区域。 。它还提供了萃取孔的不同位置的气体移动特性。当最终孔布置在煤层上方约30米处时，它具有最佳的气体提取结果，并且在水平方向上距离尾部10-20米处。此外，应将最终孔的高度调节到覆盖层结构。当最终孔靠近尾孔时，应在常规塌陷区的上部控制它们的高度;当它们靠近面部中心时，应在骨折区域的底部控制它们的高度。

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