强突出厚煤层高效安全开采技术研究

Study on Efficient and Safe Mining Technology of Outburst Thick Seam

为解决曲堤井田小工作面分层开采模式带来的采掘失衡严重、煤炭采出率低、上分层开采时瓦斯超限频繁、下分层开采时顶板稳定性差等问题。采用下分层2个小工作面"合二为一"的开采方式,煤炭产量增加近8.5万t,约占年产量的18.9%,同时少掘2条巷道,少搬家1次,节省资金约432.1万元,大量缩短工作面准备时间;实施2排顺层长钻孔整体覆盖厚煤层,分别预抽上分层和下分层煤体瓦斯,上分层工作面专门配备1条瓦斯尾巷,回采期间回风流瓦斯浓度不超过0.6%,下分层工作面顶板选用ZYP3200/17/28型液压支架支护,满足工作面支架最大承受压力2 904 k N,实现突出厚煤层高效安全分层开采。

In order to solve problems of seriously imbalance during mining,low coal recovery rate,serious gas exceeding during upper layer mining,poor roof stability during lower layer mining when Qudi Coal field used pattern of slice mining in small face. When we use the mining methods of combining two small faces in lower layer,coal production increases by nearly 85 000 t,which accounts for18. 9% of annual. And the less of excavating two roadways and movement a time saves about 4. 321 million yuan and shortens lots of time about working face preparation. Two rows of long boreholes cover the thick seam and carry out gas pre-drainage of upper layer and lower layer respectively. The concentration of gas in mining period is never over 0. 6%,when a private gas tail roadway is served for the upper face. Roof of lower layer uses the type of ZYP3200 /17 /28 hydraulic support,which meets the maximum support pressure of 2 904 k N. The technology realizes slice mining efficient and safe mining in the outburst thick seam.