
第43卷第5期 2016年10月
矿业安全与环保
MINING SAFETY & ENVIRONMENTAL PROTECTION
王中华,预据底板岩卷穿层钻孔卸压抽采试验研究[J].矿业安全与环保,2016,43(5):87-89 文章编号:10084495(2016)05008703
预掘底板岩巷穿层钻孔卸压抽采试验研究
王中华".2
Vol. 43 No.5 Oct.2016
(1.瓦斯灾害监控与应急技术国家重点实验室,重庆400037;2.中煤科工集团重庆研究院有限公司,重庆400037)摘要:为提高煤层瓦斯抽采效果,提出了预掘底板岩巷穿层钻孔卸压抽采技术。通过考察底板围岩位移量、煤层透气性系数,分析了底板岩巷上覆煤岩层的卸压效果;通过考察底板穿层钻孔的单孔抽采量及抽采半径、煤巷条带的抽采效果、煤巷掘进的预测指标及炮后瓦斯浓度,分析了卸压煤层的抽采效果。实践表明,底板岩巷布置在待掘煤巷正下方8~12m位置时穿层钻孔卸压抽采效果显著。
关键词:预掘底板岩巷;卸压抽采;卸压效果;抽采效果
中图分类号:TD712
文献标志码:B
网络出版时间:2016-09-2909:01
网络出版地址:http://www.cnki.net/kcms/detail/50.1062.TD.20160929.0901.042.html
TestResearchonPressure-reliefGasDrainagebyCrossingHoles in
PredrivingFloorRockRoadway
WANG Zhonghua'2
(I. State Key Laboratory of Gas Disaster Monitoring and Emergency Technology, Chongging 400037, China; 2. China Coal Technology and Engineering Group Chongqing Research Institute, Chongging 400037, China)
Abstract: The pressurerelief gas drainage technique by crossing holes drilled in predriving floor rock roadway was put forward in order to improve the gas drainage effect. Based on investigation of the displacement amount of floor surounding rock and the permeability coefficient of coal seams, analysis was made on the pressure relief effect of the coal seam and rock strata above the floor rock roadway; through the examination of the drainage amount and drainage radium of a single crossing hole in the floor rock roadway, the drainage effect of coal roadway strip, the prediction index in coal roadway excavation and the gas concentration after blasting, analysis was carried out on the drainage effect of the pressurerelief coal seam. The practice showed that the pressurerelief drainage effect by crossing holes was significant when the floor rock roadway was laid out at the position 8 to 12 m below the coal roadway to be excavated.
Keywords: predriving floor rock roadway; pressurerelief gas drainage; pressure relief effect; drainage effect
煤与瓦斯突出防治是一项世界性的难题,其防治措施主要有开采保护层、抽采煤层瓦斯等,但单突出煤层不具备开采保护层的条件,因此主要采用抽采煤层瓦斯的防突措施。随着煤矿开采深度的逐渐增加,瓦斯压力和地应力也相应增加,加之我国煤层赋存条件复杂、透气性差等原因,瓦斯抽采难度进一步增大,从而要求瓦斯抽采技术和工艺水平也要
收稿日期:2016-02-23;201608-22修订
基金项目:中国煤炭科工集团有限公司青年基金项目(2014QN002);中煤科工集团重庆研究院有限公司青年基金项目(2014QNJJ22)
作者简介:王中华(1984一),男,山东枣庄人,硕士,助理研究员,主要从事煤矿安全技术及工程方面的研究工作。E-
mail:boaidajia2007@126.com 万方数据
相应提高。为此,国内外研究使用了水力压裂、水力割缝、松动爆破、深孔预裂爆破、旋转水射流扩孔等提高抽采效果的增透技术[1-1],但这些技术均有各自的适应条件,且有些技术具有工艺复杂、成本高等缺点。笔者针对单一突出煤层提出一种卸压抽采方法,即预掘底板岩巷布置在待掘煤巷正下方一定距离,对巷道上覆煤岩体进行卸压,提高煤层的透气
性,进而提高穿层钻孔的抽采效果。 1试验区概况
建新煤矿为煤与瓦斯突出(以下简称突出)矿并,共发生突出63次,最大突出瓦斯量88600m,最大突出煤量1396t。实测最大瓦斯压力4.8MPa,瓦斯含量18.17~29.31m/t,煤层透气性系数为
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