| 大倾角坚硬顶板综放面采空区漏风数值模拟 |
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| 引用本文： | 谢振华.大倾角坚硬顶板综放面采空区漏风数值模拟[J].中国安全生产科学技术,2019,15(6):42-47. |
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| 作者姓名： | 谢振华 |
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| 作者单位： | (中国劳动关系学院 安全工程系，北京 100048) |
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| 基金项目： | * 基金项目: 中国劳动关系学院院重点科研项目（17YZ004） |
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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SF 6 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。
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| 关 键 词： | 采空区 煤炭自燃 漏风检测 数值模拟 |
Numerical simulation on air leakage in goaf of fully mechanized caving face with high dip and hard roof |
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| XIE Zhenhua.Numerical simulation on air leakage in goaf of fully mechanized caving face with high dip and hard roof[J].Journal of Safety Science and Technology,2019,15(6):42-47. |
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| Authors: | XIE Zhenhua |
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| Affiliation: | (Department of Safety Engineering, China University of Labor Relations, Beijing100048, China) |
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| Abstract: | 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. |
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| Keywords: | goaf coal spontaneous combustion air leakage detection numerical simulation |
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