下行穿层钻孔消突技术在揭煤中的应用实践

Application Practice of Downward Layered Drilling Technology for Eliminating Outburst in Coal Revealing

阳泉煤业集团泊里煤矿有限公司主提升井为副立井,井深640 m,主要用于生产期间提料及人员上下井。为保证后期井底淤泥、积水得到有效排除,需在副立井井底施工一条检修巷道,即井底水窝清理斜巷。施工过程中,巷道底板赋存有15#煤层,煤层平均厚度5.3 m,且具有突出危险性。通过在揭露煤层前采取下行穿层钻孔并造穴,预抽煤层瓦斯后经效果检验瓦斯含量、瓦斯压力均小于临界值,有效的对突出煤层进行了消突,保证了巷道顺利施工。

The main lifting shaft of Yangquan Coal Industry Group Boli Coal Mine Co.,Ltd.is an auxiliary shaft with a depth of 640 meters,mainly used for material lifting during production and personnel going up and down the shaft.To ensure effective removal of sludge and accumulated water at the bottom of the shaft in the later stage,it is necessary to construct a maintenance roadway at the bottom of the auxiliary shaft,which is the inclined roadway for cleaning the water pit at the bottom of the shaft.During the construction process,there is a 15# coal seam at the bottom of the roadway,with an average thickness of 5.3 meters and a risk of outburst.By using downward drilling and hole making before exposing the coal seam,and pre extracting coal seam gas,the gas content and pressure were tested to be below the critical value,effectively eliminating the outburst of the coal seam and ensuring the smooth construction of the roadway.