沿空掘巷围岩稳定性控制方案

为了提高煤炭回采率,甘肃靖远矿区红会一矿1715运输巷道采用沿空掘巷与1713采空区留设窄小煤柱的方式护巷掘进,但是,巷道掘进过程中围岩稳定性控制问题凸显。针对1715运输巷道沿空掘巷留设窄小煤柱围岩稳定性难以控制的问题,根据自然平衡拱理论,计算了巷道两帮及顶板的破坏深度,并以此为基础,结合悬吊理论,设计出了巷道锚杆锚索支护参数,提出了切顶卸压和巷道锚杆锚索联合加固的围岩稳定性控制技术方案,为沿空掘巷窄小煤柱围岩稳定性控制提供了参考。

Control Scheme for Surrounding Rock Stability ofRoadway Driving along Goaf

In order to improve the coal recovery rate,the 1715 haulage roadway of the No.1 Coal Mine of Honghui in Gansu Jingyuan Mining Area was driven along gob side entry and the 1713 gob area with narrow coal pillars.In view of the problem that it is difficult to control the stability of surrounding rock with narrow coal pillar in 1715 transport roadway driving along goaf,according to the theory of Natural Balance Arch,the failure depth of two sides of roadway and roof was calculated,and based on this,combined with the suspension theory,this paper designs the support parameters of bolt and cable in roadway,and puts forward the technical scheme of controlling the stability of surrounding rock by roof cutting and bolt and cable in roadway,which provides a reference for controlling the stability of narrow coal pillar in roadway driving along goaf.