综采工作面螺旋钻机回收煤柱可行性分析

Feasibility analysis of coal pillar recovery by auger machine in fully mechanized mining face

为确定合理的开采方案,以提高工作面资源回收率、增加企业经济效益,以纳林庙二号井6-2110工作面回收保护煤柱为研究背景,采用FLAC^3D数值模拟软件对螺旋钻回收煤柱的可行性进行分析。研究表明,螺旋钻采煤钻孔在工作面开采之前对煤柱整体的承载能力未造成破坏;在工作面开采过程中螺旋钻采煤钻孔造成钻孔外段5 m区域内的范围应力集中并发生塑性破坏,但未对煤柱整体承载能力造成影响;纳林庙二号井6^-2110工作面螺旋钻采煤布置方案安全合理,可以为面临煤柱回收问题的矿井提供一定借鉴。

In order to determine a reasonable mining scheme,improve the resource recovery rate of the working face and increase the economic benefits of the enterprise,taking the recovery of protective coal pillar at No.6^-2110 working face of Nalinmiao No.2 mine as the research background,the feasibility of recovering coal pillar by auger was analyzed by using FLAC^3D numerical simulation method.The research shows that the auger drilling has no substantial effect on the overall bearing capacity of coal pillar before the mining of the working face;the stress concentration and plastic damage occur in the area of 5m outside the borehole caused by auger mining drilling in the mining process of working face,but it does not affect the overall bearing capacity of coal pillar;the layout scheme of auger mining in the working face is safe and reasonable,which can provide some reference for coal pillar recovery in coal mine.