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Comprehensive technical support for safe mining in ultra-close coal seams: A case study
Energy Exploration & Exploitation ( IF 2.7 ) Pub Date : 2021-04-14 , DOI: 10.1177/01445987211009390
Wei Zhang 1, 2 , Jiawei Guo 2 , Kaidi Xie 2 , Jinming Wang 2 , Liang Chen 1, 2 , Wenmin Hu 3 , Jiaxing Xu 3
Affiliation  

In order to mine the coal seam under super-thick hard roof, improve the utilization rate of resources and prolong the remaining service life of the mine, a case study of the Gaozhuang Coal Mine in the Zaozhuang Mining Area has been performed in this paper. Based on the specific mining geological conditions of ultra-close coal seams (#3up and #3low coal seams), their joint systematic analysis has been performed, with the focus made in the following three aspects: (i) prevention of rock burst under super-thick hard roof, (ii) deformation control of surrounding rock of roadways in the lower coal seam, and (iii) fire prevention in the goaf of working face. Given the strong bursting tendency observed in upper coal seam and lower coal seam, the technology of preventing rock burst under super-thick hard roof was proposed, which involved setting of narrow section coal pillars to protect roadways and interleaving layout of working faces. The specific supporting scheme of surrounding rock of roadways in the #3low1101 working face was determined, and the grouting reinforcement method of local fractured zones through Marithan was further proposed, to ensure the deformation control of surrounding rock of roadways in lower coal seams. The proposed fire prevention technology envisaged goaf grouting and spraying to plug leaks, which reduced the hazard of spontaneous combustion of residual coals in mined ultra-close coal seams. The technical and economic improvements with a direct economic benefit of 5.55 million yuan were achieved by the application of the proposed comprehensive technical support. The research results obtained provide a theoretical guidance and technical support of safe mining strategies of close coal seams in other mining areas.



中文翻译:

特大型近距离煤层安全开采的综合技术支持:案例研究

为了在超厚硬顶下开采煤层,提高资源利用率,延长煤矿剩余使用寿命,本文以枣庄矿区高庄煤矿为例进行了研究。根据超近煤层(#3向上和#3较低)的特定采矿地质条件煤层)进行了联合系统分析,重点从以下三个方面进行:(i)超厚硬顶板下的岩爆预防,(ii)下煤层巷道围岩的变形控制接缝;以及(iii)工作面采空区的防火措施。鉴于上,下煤层存在强烈的爆破倾向,提出了在超厚硬顶板下防止岩爆的技术,该技术包括设置窄断面煤柱以保护巷道和工作面交错布置。3号处巷道围岩具体支护方案确定了1101工作面,并进一步提出了通过Marithan注浆加固局部裂缝的方法,以保证下煤层巷道围岩的变形控制。拟议的防火技术设想采用采空区注浆和喷洒来堵漏,从而减少了开采的超近煤层中残留煤自燃的危险。通过实施拟议的综合技术支持,实现技术和经济效益,直接经济效益555万元。研究结果为其他矿区近距离煤层安全开采策略提供了理论指导和技术支持。

更新日期:2021-04-15
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