摘要
工作面回采会导致上覆岩层卸压,并在采空区形成瓦斯流动和运移的“O”形圈裂隙,该处能够长期稳定抽放出瓦斯。通过数值模拟研究,分析、研究和实测了开采11-2煤层对上位12和13-1煤层的卸压效果、开采形成的采空区“O”形的存在位置以及高位钻孔瓦斯抽放的效果,研究表明,开采11-2煤层对12和13-2煤层卸压效果明显,煤层透气性系数增加了2880倍,高位钻孔瓦斯的抽放使13-2煤层瓦斯压力从4．5 MPa下降到0．5 MPa,瓦斯解析速度和钻屑量均处于安全值,确保了13-1煤层的安全开采。
The mining operation in the mining face would cause pressure releasing from the over strata above the mining face.An“O”type cracking for mine gas flowing and moving would be established in the goaf.A long term stable gas drainage operation could be done in those areas.With the numerical simulation research,the paper analyzed,studied and measured the pressure releasing results in the No.12 and No.13-1 seams above No.11-2 seam,the location of the“O”area in the goaf caused by the mining operation and the high ...
出处
《煤炭科学技术》
CAS
北大核心
2007年第4期16-18,21,共4页
Coal Science and Technology
基金
国家自然科学基金(50074030)
国家自然科学基金重大项目(50490270)
关键词
高位钻孔
瓦斯抽放
卸压
数值模拟
high level borehole
gas drainage
pressure releasing
numerical simulation
