摘要
针对深井松软煤巷围岩变形严重、巷道支护困难等问题,以城郊煤矿LW21106工作面沿空巷道为工程背景,建立了采动巷道增跨模型,揭示了采动增跨效应演化机理。通过构建巷道顶板横纵弯曲梁模型,指出顶板横向受力、巷道等效跨度、煤岩强度是巷道围岩损伤破坏的主控因素,提出了采动增跨效应防控对策并进行工业性试验。研究结果表明:受采动影响,巷道经历“初始围岩稳定—围岩裂隙发育扩展—围岩剪切破坏加剧—等效跨度增加”过程;巷道顶板最大正应力与应力集中系数、顶板等效跨度、巷道断面尺寸及埋深成正相关关系;巷道顶板在高应力环境下易发生拉剪破坏,增加顶板锚索数量以及锚索预紧力有利于增强顶板初期完整性。基于巷道变形破坏主控因素,提出“围岩加固–卸压–强化支护”协同防控策略;针对现场条件,采用煤柱侧向切顶+注浆加固并对破碎区域补充锚索强化支护的防控技术。现场监测结果表明,煤柱帮最大移近量为18.89cm,顶板下沉量为25.86cm,两帮移近量为29.65 cm,有效控制了煤巷围岩变形,为深井松软围岩巷道变形控制提供了参考。
Aiming at the problems of serious damage of surrounding rock and supporting difficulty in the deep soft rock roadway,taking the gob-side roadway of the LW21106 working face in Chengjiao Coal Mine as the en-gineering background,a mining induced span increasing model was established and the formation mechanism mining-induced span increasing effect was revealed.By developing a transverse and longitudinal curved beam model of the roadway roof,it is concluded that the lateral stress on the roof,equivalent span of the roadway,and coal rock strength are the main controlling factors for the damage of surrounding rock of roadway.Finally,control measures were proposed and field trial was conducted.The research results show that roadway has experienced"initial stability-fractures development-shear slider aggravation-equivalent span increase"with the mining influ-ence.The maximum normal stress of the roadway roof is positively correlated with the stress concentration coef-ficient,equivalent span of the roof,size of the roadway section and burial depth.Tensile and shear failure oc-curred in roadway roof in high stress environments.Therefore,increasing the number and pre-tension of the roof anchor cables is beneficial for enhancing the integrity of the roof.Based on the main controlling factors of roadway deformation,a collaborative control strategy of"surrounding rock reinforcement-pressure relief-reinforcement support"is proposed.Based on the on-site conditions,a control technology includes roof cutting along the lateral wall of coal pillars,grouting reinforcement,supplementing anchor cablesfor strengthen support in the fractured area is adopted.The field trial shows that the maximum displacement coal pillar is 18.89 cm,the roof subsidence of is 25.86 cm,and the maximum displacement along the unmined coal wall is 29.65 cm.The effective control of the coal roadway surrounding rock deformation provides a scientific basis for controlling the soft surrounding rock deformation in the deep coal mine.
作者
王方田
刘超
翟景辉
张洋
牛滕冲
WANG Fangtian;LIU Chao;ZHAI Jinghui;ZHANG Yang;NIU Tengchong(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory for Fine Exploration and Intelligent Devel-opment of Coal Resources,China University of Mining and Technology,Xuzhou 221116,China;Chengjiao Coal Mine,Henan Zhenglong Coal Industry Co.,Ltd.,Yongcheng 476600,China;No.2 Mine of Yungaishan Coal Mine,Henan Yongjin Energy Co.,Ltd.,Yuzhou 452570,China;Zhongyun International Engineering Co.,Ltd.,Zhengzhou 450001,China)
出处
《采矿与岩层控制工程学报》
EI
北大核心
2024年第1期76-86,共11页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金面上资助项目(51974297)
中央高校基本科研业务费专项资金资助项目(2023ZDPY03)
中国矿业大学研究生创新计划资助项目(2023WLJCRCZL034)。
关键词
深井
松软围岩
采动增跨效应
主控因素
协同防控
deep mine
soft surrounding rock
span increase effect
main controlling factors
coordinated control
