双预裂孔爆破在高瓦斯低渗透煤层中的应用研究

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英文篇名：Study on Application of Double Pre-split Drilling Hole Blasting in Coal Seam with High Content of Gas and Low Permeability 作者：李磊 英文作者：LI Lei;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling;CCTEG Chongqing Research Institute; 关键词：低渗透煤层 ; 煤层增透 ; 预裂爆破 ; 双预裂孔 ; 控制孔 ; 抽采孔 ; 瓦斯抽采 英文关键词：low permeability coal seam;;permeability enhanced of coal seam;;pre-split blasting;;double pre-split drilling hole;;control drilling hole;;gas extraction drilling hole;;gas extraction 中文刊名：矿业安全与环保 英文刊名：Mining Safety & Environmental Protection 机构：瓦斯灾害监控与应急技术国家重点实验室;中煤科工集团重庆研究院有限公司; 出版日期：2019-04-15 出版单位：矿业安全与环保 年：2019 期：02 语种：中文; 页：88-91 页数：4 CN：50-1062/TD ISSN：1008-4495 分类号：TD712.6;TD235

摘要

以绿塘煤矿601-3工作面开采的6中高瓦斯低渗透煤层为研究对象,将双预裂孔爆破技术应用于高瓦斯低渗透煤层,分析了双预裂孔爆破机理,采用数值模拟方法研究了不同预裂孔间距条件下裂纹扩展规律,考察了双预裂孔爆破对单孔瓦斯流量、单孔瓦斯浓度、煤层透气性系数的影响。研究结果表明:双预裂孔爆破区域爆破后与爆破前相比,平均单孔瓦斯纯流量提高了3. 25倍,单孔瓦斯浓度提高了2. 28倍,煤层透气性系数平均提高2. 15倍,有效提高了瓦斯抽采量,加快了工作面生产速度,保障了矿井采掘安全。
        This paper takes No.6 coal seam with high content of gas and low permeability in 601-3 working face of Lvtang Coal Mine as the research object,the double pre-split blasting technology was applied to the coal seam with high content of gas and low permeability,the double pre-split blasting mechanism was studied,numerical simulation was used to study the law of crack growth under different pre-split spacing conditions,and the influence of double pre-split blasting on single-hole gas flow,single-hole gas concentration and permeability coefficient of coal seam was investigated. The research results show that,compared to before blasting,the average pure flow of single-hole gas increases by 3. 25 times,the concentration of single-hole gas increases by 2. 28 times,and the permeability coefficient of coal seam increases by 2. 15 times on average in double presplit blasting zone. The amount of gas extraction is effectively increased,the production speed of working face is accelerated,and the safe production of mine excavation is guaranteed.

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