大倾角坚硬顶板综放面采空区漏风数值模拟
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摘要
由于大倾角坚硬顶板煤层采空区地质条件复杂,漏风规律复杂多变,因而煤自燃危险性较大。利用SF6作为示踪气体对龙东煤矿7162工作面采空区和邻近采空区进行漏风检测,得到7162工作面采空区漏风的基本分布规律。采空区内的漏风出口主要是上隅角处后部的未压实巷道,最小漏风风速随深度的增加而减少,邻近采空区的漏风与煤柱完整程度及断层大小有关,最大漏风量占到正常总供风量的27%。根据漏风检测结果,利用Fluent软件对采空区漏风渗流场进行数值模拟,得到了采空区风压和风速分布规律,离工作面距离大于100 m的采空区内部几乎不存在漏风,保留煤柱的存在使风流更容易进入采空区内部。该研究成果为采空区煤炭自燃防治提供了科学指导。
Because the geological conditions in goaf of coal seam with high dip and hard roof are complex,and the laws of air leakage are complicated and changeful,so the risk of coal spontaneous combustion is higher. The air leakage detection was carried out in the goaf and adjacent goaf of 7162 working face in Longdong coal mine by using SF6 as tracer gas,and the basic distribution laws of air leakage in the goaf of 7162 working face were obtained. The air leakage exit in the goaf was mainly the uncompacted roadway behind the upper corner,and the minimum air leakage speed decreased with the increase of depth.The air leakage of adjacent goaf was related to the completeness degree of coal pillar and the fault size,and the maximum air leakage amount accounted for 27% of the total normal air supply. According to the results of air leakage detection,the numerical simulation was conducted on the seepage field of air leakage in goaf by using Fluent software,and the distribution laws of air pressure and air speed in goaf were obtained. There was almost no air leakage inside the goaf with the distance of more than 100 m away from the working face,and the airflow was easier to enter the interior of goaf due to the existence of reserved coal pillar. The results provide the scientific guidance for the prevention and control of coal spontaneous combustion in the goaf.
Because the geological conditions in goaf of coal seam with high dip and hard roof are complex,and the laws of air leakage are complicated and changeful,so the risk of coal spontaneous combustion is higher. The air leakage detection was carried out in the goaf and adjacent goaf of 7162 working face in Longdong coal mine by using SF6 as tracer gas,and the basic distribution laws of air leakage in the goaf of 7162 working face were obtained. The air leakage exit in the goaf was mainly the uncompacted roadway behind the upper corner,and the minimum air leakage speed decreased with the increase of depth.The air leakage of adjacent goaf was related to the completeness degree of coal pillar and the fault size,and the maximum air leakage amount accounted for 27% of the total normal air supply. According to the results of air leakage detection,the numerical simulation was conducted on the seepage field of air leakage in goaf by using Fluent software,and the distribution laws of air pressure and air speed in goaf were obtained. There was almost no air leakage inside the goaf with the distance of more than 100 m away from the working face,and the airflow was easier to enter the interior of goaf due to the existence of reserved coal pillar. The results provide the scientific guidance for the prevention and control of coal spontaneous combustion in the goaf.
引文
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[15]张睿卿,唐明云,戴广龙.基于非线性渗流模型采空区漏风流场数值模拟[J].中国安全生产科学技术,2016,12(1):102-106.ZHANG Ruiqing,TANG Mingyun,DAI Guanglong.Numerical simulation of air leakage flow field in goafbased on nonlinear seepage model[J].Journal of Safety Science and Technology,2016,12(1):102-106.
[2]杨军,周开放,陈向军.柠条塔煤矿110工法采空区漏风规律及防治对策[J].煤炭技术,2018,37(2):144-148.YANG Jun,ZHOU Kaifang,CHEN Xiangjun.Air leakage regularity and control measures of 110 method in ningtiaota coal mine[J].Coal Technology,2018,37(2):144-148.
[3]张立国.浅埋深近距离易自燃煤层群复合采空区漏风规律研究[J].煤矿安全,2018,49(S1):5-8.ZHANG Liguo.Study on air leakage laws in complex goaf of shallow buried depth and close distance spontaneous combustion coal seams[J].Safety in Coal Mines,2018,49(S1):5-8.
[4]秦汝祥,戴广龙,闵令海.基于示踪技术的Y型通风工作面采空区漏风检测[J].煤炭科学技术,2010,38(2):35-38.QIN Ruxiang,DAI Guanglong,MIN Linghai.Goaf air leakage detection of type ventilation coal mining face based on tracing technology[J].Coal Science and Technology,2010,38(2):35-38.
[5]张海峰,张茂文.浅埋深综放工作面采空区漏风检测技术[J].煤矿安全,2013,44(6):66-69.ZHANG Haifeng,ZHANG Maowen.Detection technology of goaf air leakage in shallow buried depth fully mechanized caving face[J].Safety in Coal Mines,2013,44(6):66-69.
[6]李迎春,杨胜强,张帅.基于示踪气体采空区漏风通道定性识别[J].煤矿安全,2013,44(1):185-188.LI Yingchun,YANG Shengqiang,ZHANG Shuai.The qualitative identification of air leakage channels in goaf based on the tracer gases[J].Safety in Coal Mines,2013,44(1):185-188.
[7]徐庶泽,王法凯.SF6示踪气体在新集二矿1上煤采空区漏风检测中的应用[J].煤矿机械,2018,39(2):116-119.XU Shuze,WANG Fakai.Application of SF6in air leakage detection of goaf-a case in XinjiNo.2 mine[J].Coal Mine Machinery,2018,39(2):116-119.
[8]张学博,靳晓敏.“U+L”型通风综采工作面采空区漏风特性研究[J].安全与环境学报,2015,15(4):59-63.ZHANG Xuebo,JIN Xiaomin.Study on air-leakage characteristics of“U+L”type ventilation in goaf of fully mechanizedface[J].Journal of Safety and Environment,2015,15(4):59-63.
[9]李宗翔,海国治,秦书玉.采空区风流移动规律的数值模拟与可视化显示[J].煤炭学报,2008,33(1):76-80.LI Zongxiang,HAI Guozhi,QIN Shuyu.Numerical simulation and visual display of air flow pattern in goaf[J].Journal of China Coal Society,2008,33(1):76-80.
[10]徐会军,刘江,徐金海.浅埋薄基岩厚煤层综放工作面采空区漏风数值模拟[J].煤炭学报,2011,36(3):435-440.XU Huijun,LIU Jiang,XU Jinhai.Numerical simulation research on gob air leakage of shallow-buried thinbedrock thick coal seam with fully-mechanized top coal caving technology[J].Journal of China Coal Society,2011,36(3):435-440.
[11]高建良,孙望望.J型通风工作面采空区漏风与瓦斯浓度分布规律研究[J].煤炭工程,2018,50(1):132-136.GAO Jianliang,SUN Wangwang.Study on air leakage and gas concentration distribution law in working face goaf with J type ventilation system[J].Coal Engineering,2018,50(1):132-136.
[12]唐明云,戴广龙,秦汝祥.综采工作面采空区漏风规律数值模拟[J].中南大学学报(自然科学版),2012,43(4):1494-1498.TANG Mingyun,DAI Guanglong,QIN Ruxiang.Numerical analysis of air-leakage law in goaf of fully mechanized face[J].Journal of Central South University(Science and Technology),2012,43(4):1494-1498.
[13]秦汝祥,陈凯,戴广龙.采空区三维漏风路径示踪测试[J].安全与环境学报,2015,15(5):34-37.QIN Ruxiang,CHEN Kai,DAI Guanglong.On the air leakage gas tracer test in the 3-D goaf of the coal seam group mining[J].Journal of Safety and Environment,2015,15(5):34-37.
[14]秦波涛,徐琴,李鑫.三相泡沫对综放面采空区漏风的影响规律[J].中国矿业大学学报,2012,41(3):339-343.QIN Botao,XU Qin,LI Xin.Infulence of three-phase foam on the air leakage at the goaf of a fully mechanized caving face[J].Journal of China University of Mining and Technology,2012,41(3):339-343.
[15]张睿卿,唐明云,戴广龙.基于非线性渗流模型采空区漏风流场数值模拟[J].中国安全生产科学技术,2016,12(1):102-106.ZHANG Ruiqing,TANG Mingyun,DAI Guanglong.Numerical simulation of air leakage flow field in goafbased on nonlinear seepage model[J].Journal of Safety Science and Technology,2016,12(1):102-106.