孤岛煤柱应力集中区巷道布置改造及支护技术研究

冀中能源峰峰集团大淑村矿-450m水平原东翼三条大巷处于174102、172102工作面和174104、172104工作面中间的孤岛保护煤柱下方,三条大巷均采用锚网索喷支护、局部穿煤段采用U36支架加锚网喷联合支护,应力集中现象明显,巷道变形破坏严重,虽已加强支护并返修多次,但巷道围岩变形仍严重,无法保证正常安全使用。...

Isolated island pillar stress area roadway in dashucun mine optimization layout modification and support

Fengfeng Jizhong energy group Dashucun mine-450m levels in former East Wing three lane in 174102,172102,and 174104 working face in 172104 working face of the protective coal pillar beneath the middle island,three lane using the anchor rope supporting in coal,local section of the use of U36 bracket plus anchor net combined support,stress concentration phenomenon is obvious,the roadway deformation destruction,although already reinforced support and repaired many times,but the roadway surrounding rock deformation is serious,cannot ensure the normal and safe use of.In the full theory and analysis of evidence after the 450m level in former East Wing three roadway layout in the 174102 and 172102 working face goaf below,is currently driving construction process,only in 172102 working face mining stopped protective coal pillar stress concentration range below the roadway surrounding rock deformation is more serious,the repair and reinforcement after supporting the roadway,basically stable,the other position roadway stability.