厚煤层坚硬顶板区段煤柱留设尺寸与失稳控制  

Resered Size of Coal Pillar in Hard Roof Section of Thick Coal Seam and Its Instability Control Technology

作　　者：刘宁平 孙崇宁 李涛 贾晓广 方光俊 陈梁 白如鸿 孙强[2] LIU Ningping;SUN Chongning;LI Tao;JIA Xiaoguang;FANG Guangjun;CHEN Liang;BAI Ruhong;SUN Qiang(Yulin Energy Group Yushen Coal Yushuwan Coal Mine Co.,Ltd.,Yulin 719000,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]榆林能源集团榆神煤炭榆树湾煤矿有限公司,陕西榆林719000 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《煤炭技术》2023年第11期53-58,共6页Coal Technology

摘　　要：为解决厚煤层坚硬顶板下煤柱合理尺寸与失稳控制难题,以榆树湾煤矿为背景,基于微单元图像识别技术定量表征了巷道非对称破坏特征,结合有限元法和解析法,确定了煤柱合理宽度并分析了顶、帮支护强度与煤柱宽度的关系,针对性提出了巷道非对称控制方案。研究结果表明:巷道呈现帮大顶小的破坏特点,帮部S形非对称破坏突出,应是重点控制对象;随着煤柱宽度减小,帮部所需支护强度越显著大于顶板,原方案下支护强度与煤柱宽度匹配失调,加剧巷道非对称破坏;以煤柱塑性区面积占比50%、弹性核区宽度3 m为阈值,煤柱的合理宽度下限为15 m;采用优化后的方案,巷道非对称破坏得到显著改善。研究结果可为类似工况下巷道控制提供借鉴。In order to solve the problem of reasonable size and instability control of coal pillar under thick coal seam hard roof,taking Yushuwan coal mine as the background,based on micro unit image recognition technology,quantitatively characterized the characteristics of asymmetric failure of roadway,combined with finite element method and analytical method,determined the reasonable width of coal pillar,analyzed the relationship between roof and wall support strength and coal pillar width,and put forward a targeted asymmetric control scheme of roadway.The results show that:the roadway has the characteristics of large wall and small roof,and the S-shaped asymmetric failure of the wall is prominent,which should be the key control object;with the decrease of coal pillar width,the support strength required by the side is significantly greater than that of the roof,the matching between the support strength and the coal pillar width under the original scheme is out of balance,which aggravates the asymmetric failure of the roadway;taking the plastic failure rate of coal pillar 50%and the width of elastic core area 3 m as the threshold,the lower limit of reasonable width of coal pillar is 15 m;by using the optimized scheme,the asymmetric failure of the roadway has been significantly improved.The research results can provide reference for tunnel control under similar working conditions.

关 键 词：煤柱 坚硬顶板 厚煤层 关键块体 非对称破坏 

分 类 号：TD822[矿业工程—煤矿开采]