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多煤层重复采动回采巷道失稳机理与控制技术

韦四江1,2, 黄英俊1, 谭毅1,2, 王猛1,2, 秦剑云3, 杨发军3

1.河南理工大学 能源科学与工程学院，河南 焦作 454000;2.煤炭安全生产与清洁高效利用省部共建协同创新中心，河南 焦作 454000;3.库车市榆树岭煤矿有限责任公司，新疆 库车 842000

摘要:戊9-10-22290工作面为平煤六矿三水平二采区的孤岛工作面，风巷外段在采掘服务期间将会受到上覆戊8及下伏五矿己组回采影响，采掘时空关系异常复杂。 目的 为探讨多煤层重复采动回采巷道失稳机理与控制技术， 方法 基于采掘工作面应力时-空演化关系，提出平煤六矿戊9-10-22290工作面风巷外段全生命周期内的围岩控制方法，并进行现场工程应用。 结果 结果表明：上覆近距离煤层开采后，巷道顶板出现拉剪破坏；本煤层和下伏煤层回采过程中，巷道将逐段受到超前支承压力作用；根据巷道围岩所处的扰动时-空过程和高应力环境，提出“高预应力高强锚杆+锚索+深孔爆破卸压”的抗压-让压-卸压相结合的综合围岩控制技术。现场工业性试验表明，巷道服务期间两帮最大变形量为347 mm，顶板下沉和底板鼓起均在可控范围内，能够满足矿井安全生产需求，取得较好的技术和经济效益， 结论 研究结果可为类似条件下的回采巷道围岩控制提供参考。

关键词:多煤层;重复采动;回采巷道;失稳机理;围岩控制

doi:10.16186/j.cnki.1673-9787.2023050012

基金项目:国家自然科学基金资助项目（51974104）；河南省高校科技创新团队支持计划项目（22IRTSTHN005）；河南省科技攻关项目（222102320183，212102210230）

收稿日期:2023/05/07

修回日期:2023/09/22

出版日期:2024/07/31

Instability mechanism and control technology of repeated mining roadway in multiple coal seams

WEI Sijiang1,2, HUANG Yingjun1, TAN Yi1,2, WANG Meng1,2, QIN Jianyun3, YANG Fajun3

1.School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China;2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo 454000，Henan，China;3.Kuqa Yushuling Coal Mine Co.，Ltd.，Kuqa 842000，Xinjiang，China

Abstract:The working face of W9-10-22290 is an isolated working face in the second mining area of the third level of Pingmei No.6 coal mine. The outer section of the air roadway will be affected by the mining of the overlying W8 and the underlying No.5 coal mine during the mining service，and the mining space-time relationship is extremely complex. Objectives To explore the instability mechanism and control technology of repeated mining roadways in multiple coal seams， Methods based on the spatio-temporal evolution relationship of stress in the mining face，a surrounding rock control method for the entire lifecycle of the outer section of the air roadway in the W9-10-22290 working face the Pingmei No.6 coal mine was proposed and applied in field engineering. Results The results showed that the roof of the roadway presented tensile shear failure after the close coal seam mining.During the mining process of the coal seam and the underlying coal seam，the roadway would be subjected to advance abutment pressure step by step.According to the spatio-temporel disturabnce and high-stress environment of the surrounding rock of the roadway，a comprehensive surrounding rock control technology of combining resistance，yielding，and pressure relief was proposed，which included“high pre-stressed high-strength bolts+anchor cables+deep hole blasting for pressure relief”.Field industrial tests showed that the maximum deformation of the two sides during tunnel service was 347 mm，and the top settlement and floor heave were within the controllable range，which could meet the requirements of mine safety production and achieve better technical and economic benefits. Conclusions The research results provided a reference for the surrounding rock control of mining tunnels under similar conditions.

Key words:multiple coal seams;repeated mining;mining roadway;instability mechanism;surrounding rock control