大采高工作面末采期间快速贯通技术研究

Study on Rapid Holing-Through Technology of High Cutting Height Coal Mining Face During Terminal Mining Stage

为实现大采高工作面末采期间回撤通道快速顺利贯通,以万利一矿42301大采高工作面为工程背景,在末采期间采取矿压观测和顶板控制的措施,保证回撤通道贯通期间避开周期来压。在此基础上对挂网工艺进行优化,缩短了挂网时间,为回撤通道安全快速贯通提供了技术保障。实践结果表明:工作面回撤通道贯通时间大幅减少,整个贯通过程仅用了32 h;采用现场多频次测量顶底板高程的方法,保证贯通期间工作面顶底板平整,使高差从2 700 mm减小到200 mm以内,回撤通道贯通质量高,仅局部20台支架底板存在小于200 mm的台阶高差;采用矿压监测手段和顶板控制措施,保证工作面末采期间未受到矿压影响,回撤通道安全顺利贯通。

In order to realize rapid and successful holing-through of dismantling channel in high cutting coal mining face during terminal mining stage,based on No.42301 Coal Mining Face of Wanli No.1 Mine as an engineering background,mine pressure observation and roof control measures were conducted at the mining terminal period to avoid periodic weighting during the dismantling channel holing-through period .Based on the circumstances,an optimization was conducted on the steel mesh setting technique,a steel mesh setting time was re-duced and a technical protection could be provided to the safety and rapid dismantling channel holing-through protection.The practice re-sults showed that the holing-through time of the coal mining face was highly reduced and the total dismantling channel holing-through process was only 32 h.The site multi frequent measuring roof and floor elevation method was applied to ensure the roof and floor leveling during the holing-through period and to reduce an elevation difference from 2 700 mm to below 200 mm.Thus the holing-through quality of the dismantling channel would be high and there were only the floors of 20 set powered supports with a stage elevation difference of 200 mm.The mine strata pressure monitoring and measuring means and the roof control measures were applied to ensure the coal mining face free from the mine strata pressure influences during the mining terminal period and to ensure successful and safety holing-through of the dismantling channel.