宜洛煤矿沈村井鉴定为二级瓦斯矿,按三级管理。现在,±○水平有四个采区已采或正在回采,多年来曾发生的几起“冒顶”事故,很值得我们来研究分析. Shenluo Mine of Yiluo Coal Mine has been identified as Grade 2 gas mine and is managed at three levels. Now, there are four mining areas that have been mined or are being mined at the ± ○ level. Several “roof-top” accidents that have taken place over the years are worth our study and analysis.