腾晖煤业采空区顶板超长定向钻孔模拟与应用研究
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摘要
基于采动裂隙椭抛带理论提出顶板超长定向钻孔治理技术,通过理论推导、数值模拟、现场应用相结合的方法对腾晖煤业2-100放顶煤工作面顶板超长定向钻孔的合理距离及合理层位进行研究。研究结果表明:1～5号顶板超长定向钻孔内错回风巷的合理距离为20～40 m;钻孔的合理终孔层位依次为60,60,60,61和63 m。顶板初次垮落后,顶板超长定向钻孔开始发挥作用,单孔的瓦斯抽采纯量随着工作面推进开始呈周期性变化,当顶板岩层发生周期性垮落时,钻孔瓦斯抽采纯量开始急剧升高;抽采纯量达到的最大值分别为13. 88,13. 92,13. 96,14. 24和14. 32 m3/min;顶板超长定向钻孔抽采期间,上隅角瓦斯浓度与回风流瓦斯浓度呈周期性变化趋势,上隅角瓦斯浓度为0. 32%～0. 8%,整个过程中上隅角瓦斯浓度均在可控范围内。顶板超长定向钻孔治理技术可有效解决放顶煤工作面采空区的瓦斯治理难题。
The control technology of roof super-long directional borehole was put forward based on the theory of mining fissure elliptic paraboloid zone,and the reasonable distance and horizon of the roof super-long directional borehole in the 2-100 top caving coal face of Tenghui coal industry were studied through the combined method of theoretical derivation,numerical simulation and field application. The results showed that the reasonable distance for the internal staggered return airway of the No. 1 to No. 5 roof super-long directional borehole was 20-40 m,and the reasonable end borehole horizon was 60 m,60 m,60 m,61 m and 63 m in turn. After the first collapse of the roof,the roof super-long directional borehole began to play its role,and the pure drainage quantity of gas with single hole started to present the periodical change with the advancement of working face. When the roof strata occurred the periodical collapse,the pure drainage quantity of borehole gas began to rise sharply,and the maximum value of pure drainage quantity was 13. 88 m~3/min,13. 92 m~3/min,13. 96 m~3/min,14. 24 m~3/min and 14. 32 m~3/min,respectively. The gas concentration at the upper corner and the gas concentration of return air flow showed a periodic change trend during the drainage process of roof super-long directional borehole,and the gas concentration at the upper corner was 0. 32%-0. 8%,which was in the controlled range during the whole process. The control technology of roof super-long directional borehole can effectively solve the difficult problem of gas control in the goaf of top caving coal face.
The control technology of roof super-long directional borehole was put forward based on the theory of mining fissure elliptic paraboloid zone,and the reasonable distance and horizon of the roof super-long directional borehole in the 2-100 top caving coal face of Tenghui coal industry were studied through the combined method of theoretical derivation,numerical simulation and field application. The results showed that the reasonable distance for the internal staggered return airway of the No. 1 to No. 5 roof super-long directional borehole was 20-40 m,and the reasonable end borehole horizon was 60 m,60 m,60 m,61 m and 63 m in turn. After the first collapse of the roof,the roof super-long directional borehole began to play its role,and the pure drainage quantity of gas with single hole started to present the periodical change with the advancement of working face. When the roof strata occurred the periodical collapse,the pure drainage quantity of borehole gas began to rise sharply,and the maximum value of pure drainage quantity was 13. 88 m~3/min,13. 92 m~3/min,13. 96 m~3/min,14. 24 m~3/min and 14. 32 m~3/min,respectively. The gas concentration at the upper corner and the gas concentration of return air flow showed a periodic change trend during the drainage process of roof super-long directional borehole,and the gas concentration at the upper corner was 0. 32%-0. 8%,which was in the controlled range during the whole process. The control technology of roof super-long directional borehole can effectively solve the difficult problem of gas control in the goaf of top caving coal face.
引文
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[12]李树刚,徐培耘,赵鹏翔,等.综采工作面覆岩压实区演化采高效应分析及应用[J].煤炭学报,2018,43(S1):112-120.LI Shugang,XU Peiyun,ZHAO Pengxiang,et al. Analysis and application on the mining height effect of evolving law of compaction area at fully mechanized face[J]. Journal of China Coal Society,2018,43(S1):112-120.
[2]刘振明,年军,吕晓波,等.斜沟煤矿高位钻孔合理终孔位置模拟与试验研究[J].煤炭科学技术,2018,46(5):120-124,129.LIU Zhenmin,NIAN Jun,LYU Xiaobo,et al. Numerical and experimental study on reasonable bottom location of high level boreholes in Xiegou Mine[J]. Coal Science and Technology,2018,46(5):120-124,129.
[3]任卜选,丁向勇,赵发发,等.蒋家河矿高位钻孔合理层位研究[J].煤炭技术,2016,35(11):97-99.REN Boxuan,DING Xiangyong,ZHAO Fafa,et al. Determining of reasonable layer of high borehole in Jiangjiahe Coal Mine[J]. Coal Technology,2016,35(11):97-99.
[4]赵鹏翔,卓日升,李树刚,等.综采工作面推进速度对瓦斯运移优势通道演化的影响[J].煤炭科学技术,2018,46(7):99-108.ZHAO Pengxiang,ZHUO Risheng,LI Shugang,et al. Advancing speed of fully-mechanized coal mining face affected to evolution of gas migration dominant channel[J]. Coal Science and Technology,2018,46(7):99-108.
[5]杨宏民,于士芹,梁龙辉,等.低瓦斯煤层高强度开采矿井瓦斯涌出特征及分源治理[J].中国安全生产科学技术,2018,14(5):109-115.YANG Hongmin,YU Shiqin,LIANG Longhui,et al. Characteristics of gas emission and different-source control for high intensity mining mine in low gassy coal seam[J]. Journal of Safety Science and Technology,2018,14(5):109-115.
[6]吕晓波,李润芝,曹文梁.厚煤层大采高工作面高位钻孔终孔层位合理性研究[J].煤炭技术,2019,38(1):39-41.LYU Xiaobo,LI Runzhi,CAO Wenliang. Rationality study of range of final hole high borehole in large mining height working face of thick coal seam[J]. Coal Technology,2019,38(1):39-41.
[7]徐永佳.高瓦斯矿井高抽巷合理布置及终巷位置确定研究[J].煤炭科学技术,2018,46(11):93-100.XU Yongjia. Study on reasonable arrangement of upper level drainage-way and determination of final roadway position in high gassy mine[J]. Coal Science and Technology,2018,46(11):93-100.
[8]张铁岗.矿井瓦斯综合治理技术[M].北京:煤炭工业出版社,2001.
[9]张学超.高瓦斯煤层群瓦斯综合抽采技术研究[J].中国煤炭,2018,44(9):108-112.ZHANG Xuechao. Research on comprehensive gas extraction on technology in high-gassy coal seam group[J]. China Coal,2018,44(9):108-112.
[10]李树刚,林海飞,赵鹏翔,等.采动裂隙椭抛带动态演化及煤与甲烷共采[J].煤炭学报,2014,39(8):1455-1462.LI Shugang,LIN Haifei,ZHAO Pengxiang,et al. Dynamic evolution of mining fissure elliptic paraboloid zone and extraction coal and gas[J]. Journal of China Coal Society,2014,39(8):1455-1462.
[11]李树刚,徐培耘,赵鹏翔,等.采动裂隙椭抛带时效诱导作用及卸压瓦斯抽采技术[J].煤炭科学技术,2018,46(9):146-152.LI Shugang,XU Peiyun,ZHAO Pengxiang,et al. Aging induced effect of elliptic paraboloid zone in mining cracks and pressure released gas drainage technique[J]. Coal Science and Technology,2018,46(9):146-152.
[12]李树刚,徐培耘,赵鹏翔,等.综采工作面覆岩压实区演化采高效应分析及应用[J].煤炭学报,2018,43(S1):112-120.LI Shugang,XU Peiyun,ZHAO Pengxiang,et al. Analysis and application on the mining height effect of evolving law of compaction area at fully mechanized face[J]. Journal of China Coal Society,2018,43(S1):112-120.