整合矿采空区掘进巷道围岩综合控制技术研究
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收稿日期:2012-05-26
基金项目:国家自然科学基金资助(51174070);河北省自然科学基金资助(D2010001000)作者简介:侯
玮(1977-),男,河北邯郸人,北京科技大学安全技术及工程专业博士,河北工程大学副教授,主要从事矿山安全、矿井灾害控制方面的研究。
整合矿采空区掘进巷道围岩
综合控制技术研究
侯
玮1,霍海鹰1,田端信2,李智慧
3(1.河北工程大学,河北邯郸056038; 2.武安市国土资源局,河北邯郸056000;
3.冀中能源邯矿集团,河北邯郸056000)
摘
要:针对重组整合矿巷道掘进通过采空区时围岩稳定性差,掘进、支护困难的现状,通
过理论分析、方案设计、现场工业性试验,建立了采空区内掘进巷道围岩综合控制技术体系。根
据掘进巷道开挖过程中遇到的三种不同情况提出了巷道掘进前高冒区充填注浆构成人工假顶及掘进时钻孔超前注浆提高围岩强度技术方法,提出了锚杆(索)网与料石墙工字钢混凝土背板棚联合支护的多层次综合支护技术方法,解决了采空区覆岩强度低、自承结构能力小的围岩控制技术难题。实践表明,采用综合控制技术有效保证了巷道围岩稳定,对类似条件下的井巷施工具有重要的借鉴意义。
关键词:注浆加固;巷道支护;覆岩结构;采空区;矿压观测
中图分类号:TD353文献标识码:A 文章编号:1671-0959(2013)01-
0086-04Study on Comprehensive Control Technology of Surrounding
Rock along Driving Gateway in Goaf of Integrated Mine
HOU Wei 1,HUO Hai -ying 1,TIAN Duan -xin 2,LI Zhi -hui 3
(1.Hebei University of Engineering ,Handan 056038,China ; 2.Wu'a n City Land and Resources Bureau ,Handan 056000,China ;
3.Jizhong Energy Handan Mining Group ,Handan 056000,China )
Abstract :According to the status of the rock poor stability of the surrounding ,difficulties of the driving and support when a gateway driving passing through a goaf ,with a theoretical analysis ,plan design and site industrial trial ,a comprehensive control technology system of the surrounding rocks along the gateway driving in a goaf was established.According to three different conditions occurred during the excavation process of the driving gateway ,an artificial roof formed with backfill grouting in the high falling zone before the gateway driving and the surrounding rock strength technology method improved with the borehole advance grouting were provided.And a multi layer comprehensive support method with bolt (anchor )/steel mesh ,stone wall and H type steel shield support with pre -concrete back board combined support was provided to solve the control technical problems of the surrounding rock with low strength overburden strata and low self support structure capacity.The practices showed that the application of the comprehensive technology could effectively ensure the surrounding rock stability of the gateway and could have important reference significances to the mine roadway construction under the similar conditions.
Keywords :grouting reinforcement ;gateway support ;overburden strata structure ;goaf ;mine strata pressure observation 山西左权煤矿为兼并重组整合技改在建矿井。该矿井在掘进总回风巷南段期间,掘进距离回风立井贯通点100m 处遇矿井原有采空区和空巷。采空区和空巷上层岩体均已垮落,掘进过程中原工作面顶板随掘随塌,顶板上层冒落形成高冒区,掘进安全受到威胁,先掘后支常规的掘进支
护技术已不能满足冒落岩体中掘进安全的要求。为解决此难题进行了岩层稳定性分析、采空区加固技术和采空区巷道支护技术的综合性研究。
该煤矿主采煤层为15号煤,埋深为450m ,平均厚度为4.6m ,碎块状,内生裂隙发育,松散易碎,为近水平煤
6
8研究探讨煤炭工程2013年第1期