摘要
针对淮南矿区接替紧张、掘巷成本高、掘巷难度大等问题,以淮南矿区煤层赋存情况为背景,分析煤巷围岩分类,明确了适宜实施切顶留巷煤巷顶板围岩条件为Ⅰ完整型、Ⅱ较完整型;提出顶板“深浅孔交替”爆破切顶卸压技术,优化了浅孔切缝爆破、深孔预裂爆破关键技术参数;形成可缩柱网挡矸护帮体系,采用可伸缩U型钢+金属网+钢筋网+垛式支架,配合风筒布、喷浆作业联合挡矸支护;提出加固锚索+浅深孔分步多级注浆实现煤帮强化支护;采用喷涂薄喷材料解决留巷漏风问题,形成了“深浅孔交替切顶爆破巷旁支护巷内补强煤帮协同支护”的无煤柱留巷技术体系,在丁集矿1452(1)工作面进行现场应用。现场应用结果表明,“深浅孔交替”爆破技术能够缩短基本顶周期来压步距,优化留巷围岩应力环境,留巷稳定后顶板下沉量和帮部移近量为300 mm和180 mm,满足留巷复用需求。
To address the issues such as tight mining succession,high roadway excavation cost,and significant excavation difficulty in the Huainan mining area,and based on the coal seam occurrence conditions in the Huainan mining area,the classification of surrounding rock in coal roadways was analyzed.It was clarified that the suitable roof surrounding rock conditions for implementing roof-cutting pressure-relief gob-side entry retaining in coal roadways were TypeⅠ(intact)and TypeⅡ(relatively intact).The“deep and shallow hole”blasting technique for roof cutting and pressure relief was proposed.The key technical parameters of shallow-hole slotted blasting and deep-hole pre-splitting blasting were optimized.A yielding prop-and-mesh system for gangue blocking and rib support was developed.This system utilized telescopic U-steel+metal mesh+steel mesh+chock supports,combined with ventilation duct cloth and shotcreting operations for integrated gangue blocking support.Reinforcement support using reinforcing cables combined with stepwise multi-stage grouting through shallow and deep holes was proposed.The thin spraying material was used to solve the problem of air leakage in the retained roadway.The non-pillar roadway retention technology system of“alternating top-cutting blasting of deep and shallow holes,roadway side support-roadway reinforcement,and coal wall collaborative support”had been formed,which had been applied in the field at the 1452(1)working face of Dingji Mine.The field application results showed that the blasting technology of“alternating deep and shallow holes”shortened the basic roof period to press the step distance,optimized the stress environment of the surrounding rock in roadway retention.The roof subsidence and side movement after the stabilization of the roadway retention were 300 mm and 180 mm,which could meet the requirements of the reuse of the roadway retention.
作者
程详
罗勇
赵光明
肖殿才
CHENG Xiang;LUO Yong;ZHAO Guangming;XIAO Diancai(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Mining Engineering Post-Doctoral Flow Station,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Post-Doctoral Research Station,Huainan Mining Industry(Group)Co.,Ltd.,Huainan,Anhui 232001,China;Ping’an Coal Mining Engineering Technology Research Institute Co.,Ltd.,Huainan,Anhui 232001,China)
出处
《中国煤炭》
北大核心
2025年第8期57-65,共9页
China Coal
基金
安徽省科技重大专项(202203a07020011)。
关键词
切顶卸压
沿空留巷
“深浅孔”爆破
无煤柱开采
淮南矿区
roof cutting and pressure relief
gob-side entry retaining
“deep and shallow hole”blasting
coal mining without pillar
Huainan mining area
作者简介
程详(1987-),男,安徽淮南人,博士,副教授,主要从事矿山压力与岩层控制方面的研究工作。E-mail:cxaust@163.com。
