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针对目标煤层含水、渗水、顶板易破碎等复杂地质条件下真实瓦斯压力测定困难的现状,分析上行测压钻孔不同含水情况给测定结果造成的影响,发现若测压钻孔水量过大或出现塌孔,通过剔除水压得到的修正压力值将出现偏差,由此设计了以“高低位双测压管”测压技术及“两堵一注”快速注浆封孔装置的为核心测压体系。经过分析研究,并在郑煤集团振兴二矿进行现场测试,结果表明:该测压体系能够有效排除钻孔含水、塌孔等现象对测压准确性的干扰,为准确测定复杂地质条件下煤层瓦斯压力提供了整套技术方法。
Aiming at the current situation that the real gas pressure is difficult to measure under the complicated geological conditions such as the water content, water seepage and roof fragmentation in the target coal seam, the influence of the different water content in the upstream pressure measurement borehole on the determination result is analyzed. If the measured water volume is too large or appears The collapse of the hole, through the removal of water pressure correction pressure values will be deviated from the design of the “double” high and low pressure pipe “manometry and ” two plug a "rapid grouting sealing device As the core pressure measurement system. After the analysis and research, the site test was carried out at Zhenxing No.2 Mine of Zheng Coal Group. The results show that this pressure measurement system can effectively eliminate the interference of the water hole and hole collapse in pressure measurement accuracy. In order to accurately measure the coal seam under complex geological conditions Gas pressure provides a complete set of technical methods.