山东煤炭科技2024，Vol.42Issue(6)：63-66,83,5.DOI:10.3969/j.issn.1005-2801.2024.06.013
定向束状钻孔掩护突出煤层工作面巷道掘进研究
Research on Directional Bundle Drilling to Shield Roadway Excavation of Protruding Coal Seam Working Face
摘要
Abstract
In view of the problems of relatively high gas concentration and tight mining and excavation succession and others during the excavation period of the outburst coal seam crossheading in Shangshe Erjing Coal Mine,which seriously restricts the safe and efficient production of the coal mine,a directional bundle drilling shield crossheading excavation model for cross working face construction is proposed.The stress superposition and gas migration law of multiple boreholes in this coal seam are analyzed,and the precise positioning without leaving blank zones,the relatively large deep control range of directional drilling length,the larger borehole diameter of directional drilling hole expansion combined with drilling,the better hole sealing effect of"two blocking and one injection"to increase the negative pressure of extraction and accurately determine the position of five bundle directional drilling processes of the coal seam roof and floor are summarized,drilling design,borehole expansion,and hole sealing combined extraction process are obtained,multiple goals are achieved,including pre extracting coal seam gas,eliminating outburst,and accurately determining the position of coal seam roof and floor.Engineering tests are conducted on the 15203 working face of Shangshe Erjing Coal Mine,and the maximum residual gas content in the working face is 7.39 m3/t.It is determined that the extraction in this area reaches the standard,and directional bundle drilling to shield the roadway excavation in the protruding coal seam working face is feasible.关键词
瓦斯抽采/定向钻孔/掩护预抽/煤与瓦斯突出Key words
gas drainage/directional drilling/shield pre-extraction/coal and gas outburst分类
矿业与冶金引用本文复制引用
李鹏..定向束状钻孔掩护突出煤层工作面巷道掘进研究[J].山东煤炭科技,2024,42(6):63-66,83,5.基金项目
山西省基础研究计划资助项目(20210302124221) （20210302124221）
