Suncun Mine,Xinwen Coal Mining Group Corporation Limited School of Mining Engineering,China University of
Mining and Technology

针对孙村煤矿埋深1 300 m的-1 100 m水平西大巷围岩松软破碎现状,为改善大巷掘进期间矿压显现强烈的状况和降低巷道开掘后围岩的流变速度,使巷道围岩变形得到有效控制,通过采取高强让压锚杆、增加锚杆长度、锚杆安装时施加预紧力等措施,使用快速高预紧力高强度新型锚索实施二次支护,并使用管缝式锚杆对西大巷实施超前支护及先喷后锚的施工顺序。试验结果表明:巷道开掘70 d后,顶板最大下沉量65 mm,最大底鼓量312 mm,两帮最大移近量111 mm,巷道两帮移近速度大多控制在1.0 mm/d以下,极松软破碎段控制在1.5 mm/d以下,埋深1 300 m的大断面松软破碎巷道围岩变形巷道得到有效控制。

Based on the soft and broken surrounding rock conditions of the-1 100 m west roadway in depth of 1 300 m in Suncun Mine,in order to change the serio us strong condition of the mine strata pressure behaviors occurred during the mine roadway heading period and to reduce the rheologic speed of the surrounding rock a fter the mine roadway heading completed,the high strength yield bolt,enlarged bolt length,rational pre-tension made during the bolt installed and other measures were a pplied to effectively control of the surrounding rock deformation in the roadway. The fast high pre-tension and high strength new type anchor was applied to the seconda ry support. The slit wedge tubing bolt was applied to the advance support and the shotcreting and then bolt construction sequence of west roadway. The trial results sho wed that after 70 days of the mine roadway excavation and heading,the max subsidence of the roof was 65 mm,the max floor heave was 312 mm and the max converge nce of the two sidewalls was 111 mm. The convergence speed of the two sidewalls was controlled below1. 0 mm / d mostly and the ultra soft and broken section of the r oadway was controlled below 1. 5 mm/ d. The surrounding rock deformation of the large cross section roadway with the soft and broken surrounding rock was effectivel y controlled.