基于达标抽采量的顺层预抽钻孔抽采半径确定方法
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摘要
针对现有煤层瓦斯有效抽放半径测定方法实用性差的问题,尤其是压降法对封孔要求较高的问题,提出了基于抽采达标所需抽采量,进而计算出达标抽采时间来确定抽采半径的新方法。通过测试不同间距试验钻孔单日瓦斯抽采量随抽采时间的变化规律,然后确定总的抽采量并与达标抽采量作比较得出不同抽采间距的抽采时间,最终确定合理的抽采间距,并在正珠煤矿进行了现场试验。现场试验表明钻孔间距2 m组、3 m组、4 m组所在区域抽采达标所需预抽时间分别为236、260、273 d。根据抽采钻孔间距与抽采达标时间拟合公式,当设计预抽时间为240 d时,有效抽采半径为1 m。
In view of the problem of poor practicability of the existing method for measuring the effective drainage radius of coal seam, especially the problem of high sealing requirement in the pressure drop method, a new method is proposed to determine the extraction radius based on the extraction time required by the extraction standard. Through the test of the variation of the gas extraction volume with the extraction time, the total extraction time is determined and the extraction time of different extraction intervals is obtained. Finally, the reasonable extraction distance is determined, and the present field test is carried out in the coal mine of Zhengzhu Coal Mine. Field tests showed that the pre-pumping time of drainage distance of group 2 m, group 3 m and group 4 m were 236 d, 260 d and 273 d respectively. According to the fitting formula between the spacing of the extraction boreholes and the time of pumping and the standard time, when the design time is 240 days, the effective extraction radius is 1 m.
In view of the problem of poor practicability of the existing method for measuring the effective drainage radius of coal seam, especially the problem of high sealing requirement in the pressure drop method, a new method is proposed to determine the extraction radius based on the extraction time required by the extraction standard. Through the test of the variation of the gas extraction volume with the extraction time, the total extraction time is determined and the extraction time of different extraction intervals is obtained. Finally, the reasonable extraction distance is determined, and the present field test is carried out in the coal mine of Zhengzhu Coal Mine. Field tests showed that the pre-pumping time of drainage distance of group 2 m, group 3 m and group 4 m were 236 d, 260 d and 273 d respectively. According to the fitting formula between the spacing of the extraction boreholes and the time of pumping and the standard time, when the design time is 240 days, the effective extraction radius is 1 m.
引文
[1]梁冰,袁欣鹏,孙维吉,等.分组测压确定瓦斯有效抽采半径试验研究[J].采矿与安全工程学报,2013,30(1):132-135.
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[10]陈辉,牛建春,李志磊,等.SF6示踪法结合数值模拟确定钻孔抽采有效半径的研究[J].矿业安全与环保,2016,43(4):14-18.
[11]于不凡.煤矿瓦斯灾害防治及利用技术手册[M].北京:煤炭工业出版社,2005.
[2]邱爱平.压风自救系统及装置在井下避灾中的应用与不足[J].煤矿安全,1992,23(3):32-34.
[3]周连根.自救器在使用中存在的问题及对策[J].矿业快报,2004(12):36-37.
[4]卢平,李平,周德永,等.石门揭煤防突抽放瓦斯钻孔合理布置参数的研究[J].煤炭学报,2002,27(3):242-248.
[5]王兆丰,周少华,李志强.瓦斯抽采钻孔有效抽采半径的数值计算方法[J].煤炭工程,2011,43(6):82-84.
[6]季淮君,李增华,杨永良,等.基于瓦斯流场的抽采半径确定方法[J].采矿与安全工程学报,2013,30(6):917-921.
[7]徐三民.确定瓦斯有效抽放半径的方法探讨[J].煤炭工程师,1996(3):43-45.
[8]余陶,卢平,孙金华,等.基于钻孔瓦斯流量和压力测定有效抽采半径[J].采矿与安全工程学报,2012,29(4):596-600.
[9]舒龙勇,樊少武,张浪,等.基于临界残余瓦斯压力的有效抽采半径确定方法[J].煤炭科学技术,2015,43(10):81-85.
[10]陈辉,牛建春,李志磊,等.SF6示踪法结合数值模拟确定钻孔抽采有效半径的研究[J].矿业安全与环保,2016,43(4):14-18.
[11]于不凡.煤矿瓦斯灾害防治及利用技术手册[M].北京:煤炭工业出版社,2005.