高强度固帮切顶成巷方法研究  

Research on a Roadway Formation Method by Roof Cutting with Coal Rib Reinforcement

作　　者：娄庆楠 郑洪运 赵爽 时启鹏 李廷春[1] 张卫 董明晖 杨秉真 LOU Qingnan;ZHENG Hongyun;ZHAO Shuang;SHI Qipeng;LI Tingchun;ZHANG Wei;DONG Minghui;YANG Bingzhen(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao,Shandong 2665901,China;Shandong Dongshan Xinyi Coal Mine Co.,Ltd,Jining,Shandong 272116,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛市266590 [2]山东东山新驿煤矿有限公司,山东济宁市272116

出　　处：《矿业研究与开发》2021年第6期77-83,共7页Mining Research and Development

基　　金：国家自然科学基金项目(51808041)。

摘　　要：针对无煤柱切顶成巷、煤帮破碎导致巷道大变形等问题,提出了高强度固帮切顶成巷方法,布设锚索提高煤帮自承能力,利用切顶使巷道围岩处于低应力区。以新驿煤矿为背景,首先构建煤帮变形分析模型,研究了煤帮不同破碎宽度与顶板变形间关系,结果表明:煤帮破碎会导致顶板大变形,随煤帮破碎宽度增加,顶板变形速率增加。开展了不同切顶角度、切顶高度、帮锚索长度、顶底角帮锚索角度等影响因素下的数值试验,建立顶板收敛率、巷帮收敛率、锚索强度利用率、液压支柱强度利用率等量化评价指标,对比分析了单一切顶和固帮切顶两种情况的巷道变形及支护构件压力特征。结果表明:固帮切顶相较于单一切顶,巷道收敛变形进一步减小,煤帮位移约61 mm,减小34.8%,顶板位移约80 mm,减小34.4%,锚索安全裕度提高14.9%。最后,利用该技术,在新驿煤矿1706巷道进行了实际应用,监测结果表明,该方法有效控制了巷道变形,取得良好留巷效果。研究成果对类似地质条件下沿空留巷具有借鉴意义。In order to solve the problems of large roadway deformation due to coal rib break and non-pillar roadway formed by roof cutting, a roadway formation method by roof cutting with coal rib reinforcement was put forward. The self-supporting capacity of coal rib can be improved by strengthening the anchor cable, and the surrounding rock of roadway would be located in the low stress area by roof cutting. Taking Xinyi Coal Mine as the background, the coal rib break analysis model was firstly constructed, and the relationship between different broken widths of coal rib and roof deformation was studied. The results show that coal rib break will lead to large roof deformation, and the roof deformation rate increases with the increase of broken widths of coal rib. Then, numerical experiments were carried out under the influence factors such as different cutting angles, cutting heights, anchor cable lengths in coal rib, angles of anchor cable at top and bottom of coal rib. Quantitative evaluation indexes were set up including the roof convergence rate, coal rib convergence rate and utilization rate of anchor cable strength, and utilization rate of hydraulic prop strength. The roadway deformation and supporting component pressure were compared under single roof cutting condition and roof cutting with coal rib reinforcement condition. The results show that the convergent deformation of the roof cutting with coal rib reinforcement is further reduced compared with that of the single roof cutting. The displacement of the coal rib is about 61 mm, which decreases by 34.8%, the roof displacement is about 80 mm, which decreases by 34.4%, and the safety margin of the anchor cable increases by 14.9%. Finally, this technology was applied in 1706 roadway of Xinyi Coal Mine, and the monitoring results show that this method effectively controls roadway deformation and achieves good effects of roadway retaining. The research results can be used as references for gob-side entry retaining under similar geological conditions.

关 键 词：切顶卸压 巷帮加固 无煤柱开采 围岩控制 沿空留巷 

分 类 号：TD353[矿业工程—矿井建设]