摘要
针对低透气性煤层瓦斯抽采率低的问题,依据爆破理论,提出高压空气爆破冲击煤体技术,通过改变煤体的渗透性系数以提高煤层瓦斯抽采率。研制高压空气爆破成套装备,在淮南丁集煤矿实施井下高压空气爆破煤层试验,对比爆破孔瓦斯流量变化,分析增透效果。地面爆破试验结果显示:煤体试件被破坏,爆破区域内的裂缝增多,相互贯穿至样品表面,渗透性系数改变巨大。井下煤层爆破试验结果显示:试验煤层透气性得到较大改善,观测孔的瓦斯涌出量与抽采量均明显增加,部分孔的瓦斯流量增幅达55.56%,抽采瓦斯纯量最大提高了400.65%。
A et of eguipment was developed for studying blasting low air-permeability coat seam with highpressure to improve its permeability. Field experiments were carried out in the Dingji Coal Mine of Huainan, China. The results of the experiments indicate that high pressure air blasting can improve the permeability significantly, reslting an increase of 55.56% in gas flow rate in some of drill holes, and a significant increase in the guantity of extracted gas.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第4期119-125,共7页
China Safety Science Journal
基金
国家"十三五"大型油气田及煤层气开发科技重大专项(2016ZX05045-004)
中国煤炭科工集团有限公司科技创新基金资助(2014QN003)
关键词
高压空气爆破
增透
渗透性系数
衰减系数
抽采
blasting with high pressure air
technology for improving permeability
permeability coefficient
attenuation coeffigent
gas extraction
