倾斜煤层半煤岩沿空掘巷合理煤柱宽度留设研究  

Research on reasonable coal pillar width of coal-rock gob-side entry driving in inclined coal seam

作　　者：刘鹏泽 高林[1,2,3] 许帅 赵世毫 战新宇 申业兴 LIU Pengze;GAO Lin;XU Shuai;ZHAO Shihao;ZHAN Xinyu;SHEN Yexing(Mining College,Guizhou University,Guiyang 550025,China;Research Center of Roadway Support and Disaster Prevention Engineering in Coal Industry,China University of Mining and Technology-Beijing,Beijing 100083,China;National and Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]中国矿业大学(北京)煤炭行业巷道支护与灾害防治工程研究中心,北京100083 [3]贵州大学喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳550025

出　　处：《煤炭工程》2023年第2期12-18,共7页Coal Engineering

基　　金：国家自然科学基金(52004073,52264008);贵州省科技支撑计划项目(黔科合支撑[2021]一般400);贵州省科学技术基金项目(黔科合基础[2020]1Y216);贵州大学引进人才科研基金项目(贵大人基合字[2020]42号);贵州大学培育项目(贵大培育[2019]27号)。

摘　　要：针对倾斜煤层半煤岩沿空掘巷围岩产生非对称大变形的难题,以贵州土城矿1509回风巷为例,进行了该类巷道合理煤柱宽度留设研究。基于极限平衡理论建立了倾斜煤层半煤岩沿空掘巷合理煤柱宽度计算模型,结合该矿实际生产地质条件计算得出煤柱合理理论宽度为4.68~5.46m;通过数值模拟分析了5种不同宽度煤柱下1509回风巷围岩塑性区分布、应力及位移演化规律,模拟结果表明:当煤柱宽度为5m时,巷道稳定性较好且能保证矿井的回采率。现场试验结果显示,1509回风巷采用留设5m宽煤柱进行掘进护巷后,巷道轮廓相对完整,变形明显减小,围岩完整性较好,有利于提高倾斜煤层半煤岩沿空掘巷的稳定性。Aiming at the asymmetric large deformation of surrounding rock caused by unreasonable coal pillar width of gob-side coal-rock entry driving in inclined coal seam, 1509 return airway of Tucheng Mine in Guizhou is taken as an example, to study the reasonable coal pillar width. Based on the limit equilibrium theory, the calculation model is established. Combining with the actual geological conditions, the reasonable theoretical width is 4.68~5.46m.The distribution of plastic zone, stress and displacement evolution of the roadway surrounding rock under five different widths of coal pillars are analyzed through numerical simulation. It is concluded that when the width is 5m, the roadway is more stable and the recovery rate can be guaranteed. The results of industrial test show that, with the 5m coal pillars, the contour of the roadway is more complete, the deformation is controlled, the inner wall of the roof and the two sides of the borehole is smooth and there is no collapse hole, the surrounding rock is intact, which is conducive to improving the stability of the coal-rock gob-side entry driving in inclined coal seam, and further verifies the reliability of the research results.

关 键 词：煤柱宽度 半煤岩巷道 沿空掘巷 倾斜煤层 围岩控制 

分 类 号：TD263[矿业工程—矿井建设]