顶板来压规律对高位钻孔瓦斯抽采浓度的影响及抽采钻孔参数优化
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摘要
通过现场实测、理论分析及Fluent数值模拟等方法,研究了新疆某矿12B801综放工作面支架工作阻力及高位钻孔瓦斯抽采浓度变化。结果表明:顶板来压呈现大、小周期变化规律,大周期平均来压步距约60.0m,小周期平均来压步距约15.5m,大、小周期来压直接影响着高位钻孔瓦斯抽采浓度;利用大、小周期来压规律,对原设计抽采钻孔参数进行了优化,Fluent模拟表明钻孔优化后可将工作面上隅角瓦斯浓度比原始钻孔降低45%以上。现场实测优化后钻孔瓦斯抽采浓度比原方案提高近1倍,工作面上隅角瓦斯最大浓度降低了60%,证明了抽采钻孔优化的合理性。
Through the field measurement,theoretical analysis and Fluent numerical simulation,the working resistance of the support of the 12 B801 fully mechanized top coal caving face and the change of gas extraction concentration in the high level hole in a Xinjiang mine are studied.The results show that the pressure of the top plate presents a large and small periodic change law,the large period average pressure step distance about 65.0 m,the small period average pressure step distance about 15.5 m,and the large and small period pressure directly affects the gas extraction concentration in the high borehole;using the law of large and small cycle pressure,the parameters of the original design are optimized,and the Fluent simulation shows that the gas concentration in the upper corner of the working face can be reduced by more than 45%after the drilling optimization optimized.The maximum gas concentration in the upper corner of the working face is only 0.24%,which proves that the optimization of the extraction drilling is reasonable.
Through the field measurement,theoretical analysis and Fluent numerical simulation,the working resistance of the support of the 12 B801 fully mechanized top coal caving face and the change of gas extraction concentration in the high level hole in a Xinjiang mine are studied.The results show that the pressure of the top plate presents a large and small periodic change law,the large period average pressure step distance about 65.0 m,the small period average pressure step distance about 15.5 m,and the large and small period pressure directly affects the gas extraction concentration in the high borehole;using the law of large and small cycle pressure,the parameters of the original design are optimized,and the Fluent simulation shows that the gas concentration in the upper corner of the working face can be reduced by more than 45%after the drilling optimization optimized.The maximum gas concentration in the upper corner of the working face is only 0.24%,which proves that the optimization of the extraction drilling is reasonable.
引文
[1]张西斌,张勇,刘传安,等.基于采空区瓦斯运移规律的抽采钻场设计[J].煤炭科学技术,2012,40(3):56-61.ZHANG Xibin,ZHANG Yong,LIU Chuanan,et al.Design of extraction drill field based on gas migration law in goaf[J].Coal Science and Technology,2012,40(3):56-61.
[2]孙学笃,秦广鹏.低瓦斯煤层工作面高位瓦斯钻孔抽采技术应用实践[J].中国矿业,2017,26(4):110-113.SUN Xuedu,QIN Guangpeng.Application of high level gas drilling and drainage technology in low gassy coal face[J].China Mining Magazine,2017,26(4):110-113.
[3]赵鹏翔,李树刚,刘殿福,等.倾斜综放工作面采动卸压瓦斯高位钻孔抽采技术研究[J].煤炭工程,2017,49(5):76-79.ZHAO Pengxiang,LI Shugang,LIU Dianfu,et al.Study on high pressure borehole extraction technology for pressure relief gas in inclined fully mechanized top coal caving face[J].Coal Engineering,2017,49(5):76-79.
[4]王耀锋,聂荣山.基于采动裂隙演化特征的高位钻孔优化研究[J].煤炭科学技术,2014,42(6):86-91.WANG Yaofeng,NIE Rongshan.Optimization study of high level boreholes based on evolution characteristics of mining fractures[J].Coal Science and Technology,2014,42(6):86-91.
[5]马金魅,富向,郭晓敏.采空区高位钻场瓦斯抽放技术的应用[J].中国煤炭,2016,42(2):104-107.MA Jinmei,FU Xiang,GUO Xiaomin.Application of gas drainage technology in goaf high level drilling field[J].China Coal,2016,42(2):104-107.
[6]双海清,王红胜,李树刚,等.覆岩采动卸压瓦斯高位钻孔抽采技术研究[J].西安科技大学学报,2015,35(6):683-687.SHUANG Haiqing,WANG Hongsheng,LI Shugang,et al.Study on high pressure borehole extraction technology for pressure relief gas in overlying strata[J].Journal of Xi'an University of Science and Technology,2015,35(6):683-687.
[7]李宵尖,姚精明,何富连.高位钻孔瓦斯抽放技术理论与实践[J].煤炭科学技术,2007,35(4):16-17.LI Xiaojian,YAO Jingming,HE Fulian.Theory and practice of high level borehole gas drainage technology[J].Coal Science and Technology,2007,35(4):16-17.
[8]王庆雄.特大采高综采工作面覆岩关键层结构特征及矿压规律研究[D].徐州:中国矿业大学,2011.
[9]许家林,鞠金峰.特大采高综采工作面关键层结构形态及其对矿压显现的影响[J].岩石力学与工程学报,2011,30(8):1547-1556.XU Jialin,JU Jinfeng.The structure of key layers in fully mechanized coal mining face and its influence on the appearance of ore pressure in super high mining face[J].Journal of Rock Mechanics and Engineering,2011,30(8):1547-1556.
[10]钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003.
[11]朱红青,张民波,王宁,等.Y型通风高位钻孔抽采被保护层卸压瓦斯研究[J].煤炭科学技术,2013,41(2):56-59.ZHU Hongqing,ZHANG Minbo,WANG Ning,et al.Study on the extraction of pressure relief gas from protected strata by Y high ventilation borehole[J].Coal Science and Technology,2013,41(2):56-59.
[2]孙学笃,秦广鹏.低瓦斯煤层工作面高位瓦斯钻孔抽采技术应用实践[J].中国矿业,2017,26(4):110-113.SUN Xuedu,QIN Guangpeng.Application of high level gas drilling and drainage technology in low gassy coal face[J].China Mining Magazine,2017,26(4):110-113.
[3]赵鹏翔,李树刚,刘殿福,等.倾斜综放工作面采动卸压瓦斯高位钻孔抽采技术研究[J].煤炭工程,2017,49(5):76-79.ZHAO Pengxiang,LI Shugang,LIU Dianfu,et al.Study on high pressure borehole extraction technology for pressure relief gas in inclined fully mechanized top coal caving face[J].Coal Engineering,2017,49(5):76-79.
[4]王耀锋,聂荣山.基于采动裂隙演化特征的高位钻孔优化研究[J].煤炭科学技术,2014,42(6):86-91.WANG Yaofeng,NIE Rongshan.Optimization study of high level boreholes based on evolution characteristics of mining fractures[J].Coal Science and Technology,2014,42(6):86-91.
[5]马金魅,富向,郭晓敏.采空区高位钻场瓦斯抽放技术的应用[J].中国煤炭,2016,42(2):104-107.MA Jinmei,FU Xiang,GUO Xiaomin.Application of gas drainage technology in goaf high level drilling field[J].China Coal,2016,42(2):104-107.
[6]双海清,王红胜,李树刚,等.覆岩采动卸压瓦斯高位钻孔抽采技术研究[J].西安科技大学学报,2015,35(6):683-687.SHUANG Haiqing,WANG Hongsheng,LI Shugang,et al.Study on high pressure borehole extraction technology for pressure relief gas in overlying strata[J].Journal of Xi'an University of Science and Technology,2015,35(6):683-687.
[7]李宵尖,姚精明,何富连.高位钻孔瓦斯抽放技术理论与实践[J].煤炭科学技术,2007,35(4):16-17.LI Xiaojian,YAO Jingming,HE Fulian.Theory and practice of high level borehole gas drainage technology[J].Coal Science and Technology,2007,35(4):16-17.
[8]王庆雄.特大采高综采工作面覆岩关键层结构特征及矿压规律研究[D].徐州:中国矿业大学,2011.
[9]许家林,鞠金峰.特大采高综采工作面关键层结构形态及其对矿压显现的影响[J].岩石力学与工程学报,2011,30(8):1547-1556.XU Jialin,JU Jinfeng.The structure of key layers in fully mechanized coal mining face and its influence on the appearance of ore pressure in super high mining face[J].Journal of Rock Mechanics and Engineering,2011,30(8):1547-1556.
[10]钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003.
[11]朱红青,张民波,王宁,等.Y型通风高位钻孔抽采被保护层卸压瓦斯研究[J].煤炭科学技术,2013,41(2):56-59.ZHU Hongqing,ZHANG Minbo,WANG Ning,et al.Study on the extraction of pressure relief gas from protected strata by Y high ventilation borehole[J].Coal Science and Technology,2013,41(2):56-59.