文家坡煤矿工作面漏风规律及隅角封堵效果

Air leakage law and corner sealing effect of working face in Wenjiapo Coal Mine

为解决陕西彬长文家坡煤矿4105工作面采空区因工作面漏风易引发煤自燃的潜在安全隐患,利用SF6示踪法检测采空区漏风通道,掌握工作面漏风规律。利用COMSOL数值模拟软件分析不同封堵条件下的采空区瓦斯运移规律,明确了同封堵条件下的采空区瓦斯运移效果。研究结果表明,工作面100#~120#支架之间30 m范围内SF6响应度显著,存在明显漏风通道或数量较多的细小漏风通道;上下隅角均未封堵的情况下,漏风量最大,且漏风迹线遍布整个采空区,遗煤自燃概率最大;仅封堵下隅角时,漏风量相对减少,且漏风迹线在采空区中部分布较少,遗煤自燃概率有所降低。同时,对上下隅角进行封堵时,漏风量最少,且漏风迹线在采空区中部分布、工作面与采空区交界面附近分布较少,遗煤自燃概率最低。采空区漏风封堵时应对上下隅角同时进行封堵,切断漏风通道,减少采空区漏风。

In order to solve the potential safety hazard of coal spontaneous combustion caused by air leakage in the goaf of 4105 working face in Wenjiapo Coal Mine,Binchang,Shaanxi,SF 6 tracer method is used to detect the air leakage channel in the goaf,and the air leakage law of the working face is obtained.The gas migration law of goaf under different sealing conditions is analyzed by COMSOL numerical simulation software,and the gas migration effect of goaf under different sealing conditions is clarified.The results show that the response of SF 6 is obvious in the range of 30 m between 100#~120#supports in the working face,and there are obvious air leakage channels or a large number of small air leakage channels.When the upper and lower corners are not blocked,the air leakage is the largest,and the air leakage traces are throughout the whole goaf,resulting in the largest probability of spontaneous combustion of residual coal.When only the lower corner is blocked,the air leakage is relatively reduced,the air leakage trace is less distributed in the middle of the goaf,and the probability of spontaneous combustion of residual coal is reduced.At the same time,when the upper and lower corners are blocked,the air leakage is the least,the air leakage trace is distributed in the middle of the goaf,and the distribution near the interface between the working face and the goaf is less with the lowest probability of spontaneous combustion of residual coal.When sealing the air leakage in goaf,the upper and lower corners should be blocked at the same time,and the air leakage channel should be cut off to reduce the air leakage in goaf.