U型工作面采空区漏风对自然发火的影响

发布时间：2018-11-08 12:58

【摘要】：为了进一步掌握U型通风方式下采空区漏风流场分布规律,为采空区火灾预防和控制提供理论依据,采用物理相似模拟实验方法,通过搭建采空区气体渗流物理相似模拟实验平台,实现了开采煤层自然垮落,并采用采空区立体监测的手段,对U型通风方式下采空区漏风流场的分布规律进行了研究。结果表明:采空区内漏风存在3个特征区域,即"上隅角漏风影响区","架后重点漏风区"和"下隅角煤柱边缘漏风带",通过分析其各个特征区域的自燃危险性,得出"上隅角漏风影响区"的自燃危险性最大,"架后重点漏风区"的自燃危险性最小。同时,在采空区垂直方向上的漏风强度随着高度的增加而减小,最大影响高度可达到60 m左右。研究指出了U型通风工作面火灾防治的重点区域,为采空区在漏风影响条件下的防灭火工作提供了一定的理论参考。
[Abstract]:In order to further understand the distribution law of air leakage field in goaf under U-type ventilation mode and to provide theoretical basis for fire prevention and control in goaf, the physical similarity simulation experiment method is adopted. Based on the physical simulation experiment platform of gas seepage in goaf, the natural collapse of coal seam is realized, and the distribution law of air leakage field in goaf under U-type ventilation mode is studied by means of three-dimensional monitoring of goaf. The results show that there are three characteristic areas of air leakage in goaf, that is, "upper corner air leakage zone", "key air leakage zone behind frame" and "lower corner pillar edge air leakage zone". The spontaneous combustion risk of each characteristic area is analyzed. It is concluded that the danger of spontaneous combustion is the greatest in the area affected by air leakage in the upper corner and the least in the area of air leakage at the rear of the frame. At the same time, the air leakage intensity in the vertical direction of the goaf decreases with the increase of the height, and the maximum influence height can reach about 60 m. The paper points out the key area of fire prevention and control in U-type ventilation working face, and provides a certain theoretical reference for the work of preventing and extinguishing fire in goaf under the condition of air leakage.
【作者单位】：西安市公安消防支队莲湖区大队;
【分类号】：TD752.2

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