近距煤层群底板大巷掘前卸压开采技术研究  

Research on depressurized mining technology before developing floor strata tunnel in close coal-seam group

作　　者：薛俊国 杨拓 李准 耿清友 刘建庄 XUE Junguo;YANG Tuo;LI Zhun;GENG Qingyou;LIU Jianzhuang(Qianjiaying Mining Branch,Kailuan(Group)Co.,Ltd.,Tangshan 063301,China;Hebei Province Key Laboratory of Mineral Development and Safety Technique,North China University of Science and Technology,Tangshan 063210,China;Kailuan Mining Group Co.,Ltd.,Tangshan 063018,China)

机构地区：[1]开滦(集团)有限责任公司钱家营矿业分公司,河北唐山063301 [2]华北理工大学河北省矿业开发与安全技术重点实验室,河北唐山063210 [3]开滦(集团)有限责任公司,河北唐山063018

出　　处：《中国矿业》2020年第3期135-139,共5页China Mining Magazine

摘　　要：为合理设计钱家营矿近距煤层群底板岩石大巷层位和施工顺序,减缓动压影响,采用理论分析、数值模拟等手段对大巷合理布置位置、减压开采工作面尺寸及减压开采效果技术论证与对比研究。结果表明:底板大巷应在上方采面回采结束底板稳定后掘进,采面斜长至少为两倍的支承压力影响范围,巷道应布置在采面底板破裂影响范围外;钱家营矿采用180 m的9煤层卸压工作面开采,回风巷布置在12-1煤层底板岩层中,巷道两帮围岩应力降低明显,顶底板移近量为389 mm,两帮移近量为324 mm,减压开采效果良好,有利于巷道的长期维护和运营使用。In order to reduce the mining dynamic pressure adverse effect on floor strata ventilation roadway in close coal-seam group of Qianjiaying mine,main roadway's reasonable layout,length and effectiveness of pressure relief mining are researched by theoretical analysis,numerical simulation,etc.The results indicate:the bottom roadway should be exploited after the depressurized face recovery and its floor strata stability;length of upward mining plane is twice of support pressure range at least,and roadway should be arranged out of the fracture's distribution of mining face's floor strata;applying depressurized mining technology with180 m depressurized face in coal 9 and return-air roadway layout in coal 12-1 floor rock layer,the maintenance conditions of roadway are very effective,which could be explained by obviously reduced stress,roof-floor displacement reducing to 389 mm,side coal-walls displacement reducing to 324 mm.This kind of scheme is advantageous to maintain and use roadways safely.

关 键 词：近距离煤层群 减压开采 数值模拟 塑性区分布 应力分布 

分 类 号：TD263.4[矿业工程—矿井建设]