密集锚注支护技术在孤岛区石门套修中的应用  

Application of intensive bolt-grouting support technique in crosscut repeated repair in isolated coal pillar

作　　者：刘金广[1] 刘建庄 LIU Jin-guang;LIU Jian-zhuang(Kailuan(Group)Limited Liability Co.,Tangshan 063800,China;Hebei Provincial Key Laboratory of Mining Development and Safety Technology,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]开滦(集团)有限责任公司,河北唐山063800 [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

出　　处：《煤炭工程》2020年第7期24-27,共4页Coal Engineering

摘　　要：基于吕家坨矿-950二采运输石门处于深井孤岛煤柱区域,通过采用原岩应力实测和理论分析的方法评定石门周边采动应力影响范围,结果表明,石门侧方留设50m煤柱可避开应力叠加影响。同时运用FLAC^3D模拟分析了初掘架棚支护失效机制和密集锚注支护方案可靠性,结果显示后者在收敛位移、塑性区发育方面效果明显。通过工程实践表明,"两层次锚杆+锚索+注浆"支护方案最大收敛位移13.5cm,实现了套修安全和支护稳定,为类似条件软岩支护提供了借鉴。As-950 m second mining belt cross-cut of Lvjiatuo Mine is in deep mine isolated coal pillar area,initial stress measurement and theoretically analysis,the influence range of mining stress around cross-cut is evaluated,it is indicated that,the stress superposition can be avoided with a 50 m coal pillar set at the cross-cut side.FLAC3 Dis used to analyze the failure mechanism of the shed support and the feasibility of intensive bolt-grouting support scheme for initial excavation,the result shows that the latter scheme has better control effect on convergence displacement and plastic zone development.The practice shows that the maximum convergence displacement of the two levels support scheme with"bolt+anchor cable+grouting"is 13.5 cm,the safe repair and stabile support are realized.The study can provide references for soft rock support under similar conditions.

关 键 词：密集锚注 支护技术 孤岛煤柱 石门套修 高应力 

分 类 号：TD353[矿业工程—矿井建设]