端头放煤区域巷道围岩稳定性的数值模拟研究  

Numerical simulation on the stability of roadway surrounding rock in the end coal drawing area

作　　者：高鹏 赵志宁 杜厚霖 潘卫东[1,2] 查大顺 GAO Peng;ZHAO Zhining;DU Houlin;PAN Weidong;ZHA Dashun(School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam,Ministry of Education,China University of Mining and Technology-Beijing,Beijing 100083,China;Xinan Coal Industry Co.,Ltd.,Zaozhuang Mining Group,Jining Shandong 277642,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]中国矿业大学(北京)厚煤层绿色智能开采教育部工程研究中心,北京100083 [3]枣庄矿业集团新安煤业有限公司,山东济宁277642

出　　处：《矿业科学学报》2024年第6期884-896,共13页Journal of Mining Science and Technology

基　　金：国家重点研发计划(2018YFC0604501);中国矿业大学(北京)实践教改(J221109)。

摘　　要：为解决综放工作面端头不放煤导致顶煤遗失的问题,以淮北矿业集团袁店一井煤矿为研究对象建立了二维数值模型,分析了端头放煤过程中煤岩体位移场及力链场的动态变化特征,提出了端头安全放煤区段划分方法和精准放煤方案,并针对放煤空间不足的问题设计了支架改造方案。研究表明:(1)巷道锚杆(索)的主动支护作用在放煤前受工作面中部放煤影响逐渐失效,但上、下端头的主动支护作用失效具有时空性差异。(2)放煤过程中,上、下端头煤岩体流动规律显著不同。上端头煤岩体承载结构受中部放煤影响产生超前松动,超前影响范围与工作面倾角呈正比;下端头承载结构的煤岩体随放煤架数增多逐渐松动,承载能力逐步减弱。(3)端头放煤区间范围对承载结构稳定性影响显著,为保持承载稳定,应采取下端头整体分区、上端头架内分段的放煤方案。To address the significant of top coal loss due to the absence of coal drawing at the end of fully mechanized top-coal caving faces,this study established a two-dimensional numerical model with the Yuandian No.1 Mine of Huaibei Mining Group as an example for analysis.Specifically,we analyzed the dynamic variations and characteristics of the displacement field and force chain field of the coal-rock mass during the end coal drawing process.We proposed methods for safe coal drawing section division and precise coal drawing schemes.Additionally,we put forward a support modification scheme in response to the insufficient existing coal drawing space at the end.Results show that:①The active support of the anchor(cable)in the roadway fails successively before the formal coal drawing at the end area,due to the influence of the coal drawing in the middle of the working face.However,there are temporal and spatial differences in the failure of the active support effect of the anchor(cable)at the upper and lower end roadways.②The flow of the coal-rock mass demonstrate significant differences in at the upper and lower ends of the working face during the end coal drawing process.The coalrock mass in the bearing structure around the lower end roadway gradually loosens with the increase in the number of transition supports,leading to a gradual weakening of bearing capacity.The coal-rock mass in the bearing structure around the upper end roadway experiences advanced loosening due to the influence of coal drawing in the middle of the working face,with the advanced influence distance being proportional to the dip angle of the working face.The coal-rock mass within the advanced influence range will also gradually loosen and eventually penetrate.③The sectional range of the end coal drawing area has a significant impact on the bearing capacity of the surrounding roadway structure.To maintain the stability of the bearing structure,the end coal drawing scheme for the working face can be set as:overall partitioning at the lower end

关 键 词：端头放煤 时空性差异 流动特征 放煤区段 支架改造 

分 类 号：TD821[矿业工程—煤矿开采]