极近距离煤层上覆采空区下大断面切眼掘进技术研究

Research on Tunneling Technique for the Cut-hole with the Large Section under Goaf in Extremely Close Coal Seams

随着煤炭开采深度不断增加,很多矿区在工作面布置上都存在近距离煤层采空区下回采的问题。由于上覆工作面回采后采空区内垮落不充分,矿山压力分布规律性不强,且采空区下巷道掘进期间,受二次扰动影响易造成顶板裂隙发育,对上覆采空区形成漏风通道,容易引发采空区内有毒有害气体外溢和采空区内遗煤自燃事故,极近距离煤层采空区下大断面巷道掘进问题尤为突出。本论文以新集二矿2201采区首个采空区下工作面切眼掘进为研究背景,制定了极近距离煤层上覆采空区下大断面巷道掘进施工方案,取得了成功并形成了类似条件下的安全掘进综合技术措施,为后续指导极近距离煤层上覆采空区下开采拓展了思路。

With the increasing of coal mining depth,many mining areas have the problem of mining under goaf in t ex⁃tremely close coal seams.Because of the overlying after mining face goaf caving inadequate,the mine pressure distri⁃bution regularity is not strong,and under the goaf roadway drivage,affected by the secondary disturbance of the roof fracture,the overlying goaf air leakage passage formation,which is easy to cause the toxic or harmful gases within the mined-out area and traces of mined-out area in coal spontaneous combustion accident,the drivage problem with large section roadway under goaf in extremely close to the coal seams is particularly prominent.The research back⁃ground of this pa per is the cut hole under goaf in 2201 mining area of xinji no.2 mine.The construction plan of the large section roadway under the extremely close coal seams is formulated.The comprehensive technical measures for safe tunneling under similar conditions have been developed successfully.The train of thought is expanded for the fol⁃low-up guidance of mining under goaf of the extremely close coal seams.