岩巷测压分段分时封孔法试验研究

Experimental Investigation on Sealing Method of Subsection and Time-Sharing in Stone Head

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。岩巷下向孔测压,当隔离岩柱较厚、煤层瓦斯压力较高时,利用水泥砂浆一次性封孔很容易产生漏气现象。本文提出分段分时封孔法,并在岳城煤矿加以应用,由试验效果可知,该封孔方法能够克服单纯利用水泥砂浆封孔时产生导气裂隙现象,达到严密钻孔之目的,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 steam leakage using the cement mortar to seal the borehole in once when the separate rock pillar is very thick and the gas pressure is high when we determinate the gas pressure using the downward - hole in the stone head. This article proposes a new sealing method named sealing method of subsection and time - sharing and applies it in the Yuecheng Coal Mine, from the test resorts we can know that this sealing method gets over the defect that when we use the cement mortar merely to seal the borehole will cause steam leakage, this method can seal the holes strictly and determinate the gas pressure exactly.