千米瓦斯矿井小煤柱巷道滞后解危技术
Technology of delay in solving danger in small pillar roadway of kilometer gas mine
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摘要: 针对千米瓦斯矿井回采过程中小煤柱巷道受相邻采空区侧向悬顶影响的问题，以某矿1208工作面小煤柱巷道为研究背景，在进行工程实践基础上，详细介绍了双端封堵水力压裂技术滞后解危的施工工艺和方法，并对工程施工效果进行了分析。结果表明：双端封堵水力压裂技术可以规避裂隙存在，能够实现有效保压，是侧向悬顶滞后解危的较好方法；基于钻孔窥视、应力监测、矿压规律分析，切顶后围岩裂隙发育明显，采动影响前侧向悬顶已经破断，表现为钻孔应力计数据明显下降，二次采动影响下工作面下部来压明显减弱，实现了良好的解危效果。Abstract: Aiming at the problem that the small coal pillar roadway is affected by the lateral hanging roof of adjacent goaf in the mining process of kilometer gas mine, taking the small coal pillar roadway of 1208 working face in a mine as the research background. On the basis of engineering practice, this paper introduces the construction technology and method of double end plugging hydraulic fracturing technology in detail, and analyzes the engineering construction effect. The research results show that the double end plugging hydraulic fracturing technology can avoid the existence of fractures and achieve effective pressure maintenance, which is a better method for lateral hanging roof lag; based on borehole peeping, stress monitoring and analysis of mine pressure law, the cracks of surrounding rock are obviously developed after roof cutting, and the front overhanging roof affected by mining has been broken, which shows that the borehole stress meter data is significantly decreased, and the pressure at the lower part of the working face is significantly weakened under the influence of secondary mining, achieving a good effect.
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