石门测压分段分时封孔法在裕民煤矿的应用研究

Application Studies on the Sealing Method of Subsection and Time-Sharing in the Stone Head in Yumin Coal Mine

煤层原始瓦斯压力对矿井瓦斯防治工作起着重要作用,准确测定瓦斯压力是一项重要而又技术性很强的工作,成功测定获得煤层原始瓦斯压力的关键在于封孔技术。岩巷上向孔水泥砂浆封孔测压,当隔离岩柱较厚、钻孔倾角较大时,由于水泥砂浆自重及注浆泵施加的压力很容易使砂浆冲破孔口阻挡物而喷出钻孔,造成封孔失败。经分析研究,提出分段分时封孔法,并在裕民煤矿加以应用,由试验效果可知,该封孔方法能够达到顺利封孔、严密钻孔之目的,从而准确测得煤层瓦斯压力值。

The original coal-seam gas pressure plays an important role on the coal mine＇s gas prevention;it is an important and a technical work to determinate the gas pressure exactly,the key to maintain the original coal-seam gas pressure successfully is the hole sealing technique.It is easily to cause erupting because of the cement＇s dead load and the injection pump＇s pressure when the rock stratum is thick and the inclination is big.After studying the problem we proposes a new sealing method named sealing method of subsection and time-sharing and applies it in the Yumin Coal Mine,from the test resorts we can know that this sealing method can seal the holes strictly and determinate the gas pressure exactly.