多煤层开采煤矸互层顶板动压巷道围岩稳定性研究与控制  

Study and Control of Surrounding Rock Stability of Dynamic Pressure Roadway with Coal Gangue Interbed Roof in Multi-coal Seam Mining

作　　者：陈金宇 刘华枢[5] 孙卓越 武汉成 郑奎辉 武林 董光祥 CHEN Jinyu;LIU Huashu;SUN Zhuoyue;WU Hancheng;ZHENG Kuihui;WU Lin;DONG Guangxiang(CCTEG Coal Mining Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;Coal Mining and Designing Branch,China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,China Coal Research Institute,Beijing 100013,China;Heilongjiang Longmei Shuangyashan Mining Co.,Ltd.,Shuangyashan 155100,China;Dongrong No.1 Coal Mine,Heilongjiang Longmei Shuangyashan Mining Co.,Ltd.,Shuangyashan 155100,China)

机构地区：[1]中煤科工开采研究院有限公司,北京100013 [2]天地科技股份有限公司开采设计事业部,北京100013 [3]煤炭科学研究总院开采研究分院,北京100013 [4]煤炭科学研究总院煤炭资源高效开采与洁净利用国家重点实验室,北京100013 [5]黑龙江龙煤双鸭山矿业有限责任公司,黑龙江双鸭山155100 [6]黑龙江龙煤双鸭山矿业有限责任公司东荣一矿,黑龙江双鸭山155100

出　　处：《煤炭技术》2023年第6期62-66,共5页Coal Technology

基　　金：国家自然科学基金资助项目(52174080)。

摘　　要：为了解决多煤层开采煤矸互层顶板动压巷道围岩稳定性问题,以东荣一矿为工程背景,分析18层煤回采对20煤层巷道掘进的影响。对20煤层地应力环境、顶板强度及结构进行测试,建立数值模型进行分析并得出围岩控制方案,并结合现场矿压监测数据进行方案验证。研究结果表明:上层煤回采工作面与下层煤掘进工作面的水平错距是影响多煤层开采中下层煤巷道围岩稳定性的关键因素;数值模拟结果表明,当水平错距为40 m时,20煤层掘进工作面已进入增压区,应力集中系数达到2.5,现场矿压监测显示,当回采工作面距离测站40 m,锚杆锚索受力开始明显增加;通过实施高预应力强力锚杆锚索组合支护方案,20煤层右三片下料道未发生锚杆锚索破断现象,顶板最大下沉量为182 mm,两帮最大变形量为120 mm,巷道变形量大幅度减小,围岩稳定性得到较大提高。In order to solve the problem of the stability of the surrounding rock of the multi-coal seam mining coal gangue interlayer roof dynamic pressure roadway,taking Dongrong No.1 mine as the engineering background,the influence of No.18 coal seam mining with a layer spacing of 38 m on the No.20 coal seam roadway excavation was studied.Firstly,the in-situ stress environment,roof strength and structure of No.20 coal seam are tested,then the numerical model is established for analysis,and the surrounding rock control scheme is obtained,which is verified combined with the onsite ground pressure monitoring data.The results show that the horizontal offset between the upper coal mining face and the lower coal heading face is the key factor affecting the surrounding rock stability of the middle and lower coal roadway in multi-coal seam mining;the numerical simulation results show that when the horizontal offset is 40 m,the No.20 coal seam heading face has entered the pressurization area,and the stress concentration factor reaches 2.5,the on-site ground pressure monitoring shows that when the mining face is 40 m away from the measuring station,the stress of anchor bolt and anchor cable begins to increase significantly;through the implementation of the combined support scheme of high prestressed strong bolt and anchor cable,there is no broken bolt and anchor cable in the right three blanking channels on the No.20 coal seam floor.The maximum subsidence of the roof is 182 mm and the maximum deformation of the two sides is 120 mm,the deformation of the roadway is greatly reduced and the stability of the surrounding rock is greatly improved.

关 键 词：多煤层 软弱顶板 动压巷道 矿压监测 锚杆(索)受力 

分 类 号：TD353[矿业工程—矿井建设]