准确测定煤层瓦斯压力,是科学有效地制定瓦斯防治措施的基础工作。下向钻孔测压往往因受承压水的影响,测出的不是真实的瓦斯压力而是水压。采用分段高压注浆、压风排聚氨酯等封孔技术,有效地封堵了钻孔围岩中的裂隙,排除了煤层顶板裂隙水的影响,准确地测出了煤层的瓦斯压力。 Accurate determination of coal seam gas pressure is a scientific and effective development of gas prevention and control measures of the basic work. Downhole borehole pressure measurement is often affected by the pressure of the water, not the real gas pressure measured but water pressure. Sealing techniques such as high-pressure grouting in sub-high pressure and polyurethane in pressure-air row effectively block the cracks in the surrounding rock of the borehole, eliminate the influence of fissure water in the coal seam roof and accurately measure the gas pressure in the coal seam.