不同通风方式对大倾角采空区煤自燃危险区域的影响研究

Study on the influence of different ventilation modes on dangerous area of coal spontaneous combustion in deep-inclined gob

针对东峡煤矿大倾角工作面采空区现场危险区域难确定的问题,在确定工作面及采空区参数的基础上,采用相似模拟试验方法,构建了采空区自燃“三带”模拟试验系统,得出了大倾角工作面采空区在不同风量、不同风向下O2浓度的分布规律。结果显示:大倾角采空区自燃“三带”呈立体分布;随着工作面风量的增大,风流进入采空区的深度以及对采空区的影响高度增大;上、下行通风条件下自燃“三带”主要分布在下巷道侧。

In view of the problem that it was difficult to determine the dangerous area in the gob of Dongxia Coal Mine,based on the parameters of working face and gob,the authors constructed a simulation experiment system of"three zones"of gob spontaneous combustion following the similarity simulation test,and obtained the distribution law of O2 concentration in the deep-inclined gob under different air volume and different wind direction.The results showed that"three zones"of spontaneous combustion in deep-inclined gob were three-dimensional distributed;with the increase of air volume in working face,the depth of air flow into gob and the influence height were increased;the"three zones"of spontaneous combustion were mainly distributed on the side of down roadway under the condition of upward and downward ventilation modes.