西山矿区煤层顺层孔CO_2爆破增透试验研究  

Experimental Study on CO_2 Blasting Pre-splitting of Bedding Hole in Xishan Coal Mining Area Coal Seam

作　　者：贺志宏 夏仕柏[2] 

机构地区：[1]西山煤电(集团)有限责任公司,山西太原030053 [2]煤矿瓦斯治理国家工程研究中心,安徽淮南232001

出　　处：《山西焦煤科技》2017年第8期22-27,33,共7页Shanxi Coking Coal Science & Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB201205)

摘　　要：为提高西山矿区煤层透气性,缩短瓦斯抽采达标时间,分析了煤层顺层孔CO_2预裂增透技术可行性,模拟了CO_2预裂增透半径。研究结果表明:CO_2爆生气体计算压力大于围岩作用下煤体强度,CO_2爆破煤层增透具备技术可行性;数值模拟显示,经过CO_2预裂爆破后,预裂效果最好的是屯兰矿2#煤,煤层裂隙半径4.20 m;其次是屯兰矿8#煤,煤层裂隙半径3.90 m;再次是马兰矿8#煤,煤层裂隙半径3.45 m;最后是东曲矿8#煤,煤层裂隙半径3.30 m.现场试验表明,东曲矿8#煤爆破孔间距按65 m布置,压裂区平均单孔抽采纯流量是未压裂区的32倍。In order to improve the coal seam permeability of Xishan mining area,shorten the time of gas drainage standard,the feasibility of CO_2 blasting pre-splitting technology in coal seam is analyzed. The CO_2 blasting presplitting radius is simulated. The results show that CO_2 detonation pressure is greater than the strength of coal,coal seam permeability can be increased by using CO_2 blasting. Simulation shows that pre-splitting effect of No. 2 coal in Tunlan coal mine is the best,the fracture radius is 4. 20 m,the fracture radius of No. 8 coal in Tunlan coal mine is3. 90 m,the fracture radius of No. 8 coal in Malan coal mine is 3. 45 m,the fracture radius of No. 8 coal in Dongqu coal mine is 3. 30 m. The field test shows that the average flow rate of single hole drainage in fractured zone is 3. 2times of non-fractured zone when the blasting hole spacing of No. 8 coal in Dongqu coal mine is 65 m.

关 键 词：低透气性煤层 瓦斯抽采 CO2爆破 西山矿区 

分 类 号：TD712.61[矿业工程—矿井通风与安全]