岩巷下向孔瓦斯压力直接测定法的改进及应用

Improvement and Application of Direct Gas Pressure Determination in Downward-Stone-Head Hole

瓦斯压力是煤层瓦斯重要的基本参数,其对确定煤层瓦斯含量、进行矿井瓦斯涌出治理、瓦斯抽放,以及煤与瓦斯突出预测防治等具有重要的指导意义。对于岩巷下向孔测压,当煤层埋深较深、岩孔较深、测压点小、地质构造较为复杂时,准确测定瓦斯压力是一项技术性很强的工作,鉴于目前瓦斯压力直接测定法中封孔的问题,提出用"聚氨酯—水泥砂浆—聚氨酯"加木楔分段分时封孔法,对当前下向孔瓦斯压力直接测定法具有一定的参考价值。

Gas pressure is an important basic parameters of the coalseam. Gas pressure has important advising significance to determine coal seam gas content , the control of gas emission, gas drainage, and the prevention and control of coal and gas outburst. It is an very technical work to determinate the gas pressure exactly when the hole is downword with, the coal seam depth is deeper, the rock hole is deeper and more complex geological structures. In view of the sealing problems of the direct determination of gas pressure, this paper proposes the sealing method of subsection and time - sharing ＂polyurethane - cement -polyurethane＂ and wooden wedge, which has some reference values in downward -hole gas pressure determination.