深部强矿压矿井煤层覆岩爆破卸压机理研究
Mechanism of pressure relief by blasting in the overlying strata of deep coal mine
王永军 1孟凡贞 1吕文茂 1张垚 2赵春虎 3钟林华 1胡东祥1
作者信息
- 1. 兖矿能源集团股份有限公司,山东 邹城 273500
- 2. 中国矿业大学深地工程智能建造与健康运维全国重点实验室,江苏 徐州 221116
- 3. 中煤科工西安研究院(集团)有限公司,陕西 西安 710077
- 折叠
摘要
为实现深部矿井开采强矿压的高效治理,本文提出首先在煤层覆岩顶板布置"U"型巷道,然后对"U"型巷道中间的岩层进行集中爆破卸压的强矿压治理方案.以西北矿区某深部强矿压矿井为研究背景,在两种岩性的坚硬顶板中,各设计了两种不同埋深的"U"型巷道布置方案,分别是埋深-800 m、-825 m和埋深-850 m、-875 m.研究结果表明,采用"U"型巷道岩层爆破后,煤层采动过程中的采场应力、位移均有所减小.而"U"型巷道爆破卸压效果不仅与相对层间距有关,还与"U"型巷道所在岩层的岩性有关.在岩层岩性相同的情况下,"U"型巷道与下煤层的相对层间距越小,采场爆破卸压效果越好.
Abstract
To effectively reduce the strong mining pressure in deep coal mine excavation,it is proposed in this study to drive a U-shaped roadway in the overlying strata of the coal seam,and effectively release the strong mine pressure through rock blasting.Based on the case of a deep coal mine located in the northwest,two different U-shaped roadway layout schemes are designed for hard rock,the burial depth is-800 m,-825 m and-850 m,-875 m,respectively.The results indicate that blasting in the U-shaped roadway significantly reduces stress and displacement in the working face during the coal mining process.It is shown that the effectiveness of the blasting for pressure relief in the U-shaped roadway is influenced by both relative layer spacing and mechanical behavior of the overlying strata.For the blasted rock strata with similar rock properties,a lower relative spacing between the U-shaped roadway and the coal seam can result in more effective pressure relief.
关键词
强矿压/"U"型巷道/埋深/爆破卸压/卸压效果Key words
strong mining pressure/U-shaped roadway/burial depth/blasting pressure relief/pressure relief effect引用本文复制引用
出版年
2024
NETL
NSTL
万方数据