掘进工作面支护设计与防尘
2017-02-16樊腾飞
樊腾飞
摘要:云盖山煤矿23302掘进工作面位于二叠系山西组中下部的二1煤层,工作面煤层总体呈单斜状,巷道支护设计,顶部选用Ф20mm,长度为2200mm的小螺距高强度筋螺纹钢锚杆,锚杆间距1000mm、排距800mm,可满足顶板支护要求,帮部选用Ф20mm,长度为1800mm的小螺距高强度筋螺纹钢锚杆,锚杆间距900mm、排距800mm。通过在掘进之前利用钻孔向煤体注入压力水,从而增加煤体水份,增强煤体粘结性,减少煤尘飞扬,并起到释放瓦斯的作用。
Abstract: The 23302 driving face of Yungaishan Coal Mine is located in the B1 seam of the middle and lower part of Shanxi Formation of Permian system. The working face is of single oblique shape and the roadway supporting design is adopted. The top uses Ф20mm and 2200mm long small pitch high strength rebar steel bolt, bolt spacing 1000mm, row spacing 800mm, to meet the roof support requirements. The side uses Ф20mm, 1800mm long small pitch high strength rebar steel bolt, bolt spacing 900mm, row from 800mm. By drilling water into the coal body before drilling, pressure water is injected into the coal, which increases the water content of the coal body, strengthens the cohesiveness of the coal body, reduces the coal dust and plays the role of releasing the gas.
關键词:掘进工作面;支护设计;煤体注水;防尘
Key words: driving face;support design;coal injection;dust prevention
中图分类号:TD353 文献标识码:A 文章编号:1006-4311(2017)04-0084-02
0 引言
矿井巷道开挖后应力重新分布。如果不采取支护措施,造成围岩的位移和变形,使生产安全无法得到有效保证。要加强支护,不仅要实现保障措施的全面保障,保持巷道的安全。有许多种用于煤矿井下巷道支护的技术,而我们通常使用的支护技术包括锚杆支护技术、砌碹护技术,棚式和应力控制技术的支护技术。通过在掘进之前利用钻孔向煤体注入压力水,从而增加煤体水份,增强煤体粘结性,减少煤尘飞扬,并起到释放瓦斯的作用。
云盖山煤矿位于禹州市西南部35km处的磨街乡境内,矿井主要含煤地层为石炭系上统太原组及二叠系下统山西组、下盒子组和上统上石盒子组;矿井井田基本构造形态为走向北东,倾向南东的单斜构造。煤层倾角13-20°,走向NE35-42°;倾向SE55-48°;矿井目前通风、供电、运输、排水、提升、瓦斯抽采、监测监控、人员定位、通信联络、压风自救、供水施救、紧急避险等系统完善,运行正常[1-2]。……
