U型工作面采空区漏风对自然发火的影响

西安市公安消防支队 莲湖区大队,陕西 西安 710002

采空区; 自然发火; 相似模拟; 漏风规律; 气体浓度

Effect of air leakage on spontaneous combustion at goaf of U-shape working face
LI Yun-hua

(Lianhu District Detachment of Police Fire Drigade,Xi'an 710002,China)

goaf; spontaneous combustion; similar simulation; air leakage law; gas concentration

DOI: 10.13800/j.cnki.xakjdxxb.2015.0106

备注

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。

In order to further understand the air leakage law in goaf with U-shape ventilation system and provide theoretical basis for fire prevention and control,we use physical simulation experiment method and build the experimental platform for similar simulation of goaf gas seepage.We also achieve the natural caving of coal mining and uses the three-dimensional monitoring means to study the air leakage law in goaf with U-shape ventilation system.The results show that:the air leakage exists in three characteristic regions as follows,the “air leakage region with upper corner”,“air leakage region behind the support”and“air leakage region of lower corner pillar edge”.According to the analysis of the spontaneous combustion hazard of each feature area,we know the spontaneous combustion hazard of “air leakage region with upper corner” is the highest,and the spontaneous combustion hazard of “air leakage region behind the support” is the lowest.At the same time,the air leakage intensity increases with the height decreases in the vertical direction in goaf,and the biggest impact height can reach 60 m.The research points out the key regions of fire prevention in U-shape ventilation system,and provides a theoretical guidance for fire prevention work at goaf with air leakage influence.