强突出厚煤层高效安全开采技术研究
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摘要
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.
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.
引文
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[11]李晓华,戚新红,韩真理,等.近距离高瓦斯突出煤层群首采工作面区域防突技术应用与分析[J].中国安全生产科学技术,2014,10(12):155-160.
[2]王金华.特厚煤层大采高综放开采关键技术[J].煤炭学报,2013,38(12):2089-2098.
[3]刘长友,李新宝.煤炭开采新理论与新技术[M].徐州:中国矿业大学出版社,2008.
[4]吴键,孟宪锐,姜耀东.中国放顶煤开采技术的发展[M].北京:煤炭工业出版社,1999.
[5]王家臣.我国综放开采技术及深层次发展问题探讨[J].煤炭科学技术,2005,33(1):14-17.
[6]王宇.大采高综放开采方法探讨[J].煤炭科学技术,2013,41(S):32-36.
[7]尹希文,闻少宏,宁宇.大采高工作面煤壁片帮特征分析与应用[J].采矿与安全工程学报,2008,25(2):222-225.
[8]王国法,庞义辉,刘俊峰.特厚煤层大采高综放开采机采高度的确定与影响[J].煤炭学报,2012,37(11):1777-1782.
[9]程建祯.大采高工作面开采方式的合理选择[J].煤炭科学技术,2011,39(5):11-17.
[10]孟宪锐,王鸿,刘朝晖,等.我国厚煤层开采方法的选择原则与发展现状[J].煤炭科学技术,2009,37(1):39-44.
[11]李晓华,戚新红,韩真理,等.近距离高瓦斯突出煤层群首采工作面区域防突技术应用与分析[J].中国安全生产科学技术,2014,10(12):155-160.