综采工作面废巷封闭技术实践探析

Practice and Exploration and Analysis of Closed Technology for Abandoned Roadway in Fully Mechanized Mining Face

针对工作面缩面期间存在的通风、防灭火、瓦斯防治以及缩面完成后废巷封闭等问题,以麻家梁矿14104-1工作面为研究对象,对工作面缩面期间的支护工艺、补巷掘进施工期间的通风系统进行了设计,并在工作面设备“小搬家”完成后对遗留废巷进行封闭充填及气体置换。废巷共施工有7道密闭,整个工作面缩面技措工程累计施工22 d,工作面各类气体均保持在可控范围,工作面CO最高浓度控制在2.4×10^(-5)以下,南回风大巷瓦斯浓度维持在0.51%~0.83%之间,通风系统稳定、可靠。工作面施工缩面、废巷封闭技术工艺后,工作面继续向前推进了近397 m,煤炭资源多回收了约51万t,产生的直接经济效益约1.5亿元。该技术工艺有效提高了施工安全性,为工作面缩面、设备回撤、矿井采掘接替和安全生产提供了良好的环境。

Aiming at the existing problems during the face shrinkage period of the working face such as ventilation,fire prevention and extinguishing,gas prevention and control,and the closure of abandoned roadways after the completion of the face shrinking,etc,the 14104-1 working face in Majialiang Mine is taken as the research object.The support technique during the face shrinkage period of the working face and the ventilation system during the supplementary roadway excavation construction period are designed.After the completion of the"small move house"of the working face equipment,the closure and filling and gas replacement of the remaining abandoned roadways are conducted.A total of 7 abandoned roadways are constructed to be closed.The accumulated construction time of the face shrinkage technology project of the entire working face is 22 days,and all types of gases in the working face are kept within a controllable range.The maximum concentration of CO in the working face is controlled below 2.4×10^(-5),and the gas concentration in the south return air main roadway is maintained between 0.51%to 0.83%,the ventilation system is stable and reliable.After the construction shrinkage and closure technology of the abandoned roadway,the working face continued to advance by nearly 397 m,and about 510000 tons of coal resources were recovered,generating a direct economic benefit of about 150 million yuan.This technology effectively improves construction safety,providing a good environment for face shrinkage of working face,equipment withdrawal,mine mining and excavation replacement,and safe production.