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构造煤发育区K1值低指标煤与瓦斯突出原因分析

Cause analysis on coal and gas outburst in low index with K1 value of tectonic coal developed area

  • 摘要: 工作面突出危险性预测及效果检验是煤与瓦斯突出防治的最后一道“关卡”,预测及效检结果的准确性是突出防治成功与否的关键。针对构造煤发育区“低指标突出”现象频发问题,现场跟踪测试掘进工作面钻屑瓦斯解吸指标K1并采集构造煤及原生煤煤样进行K1指标实验室测试,分析发现相同吸附平衡压力条件下构造煤的K1值明显高于原生煤, K1值与构造煤发育程度关系密切,构造煤越发育,K1值越大。为研究“低指标突出”问题的内在原因,采用恒温瓦斯放散试验对构造煤的瓦斯放散初期特征进行研究,基于试验结果对K1测定结果偏离真实值的技术原因进行分析,结果表明:采用巴雷尔公式计算K1的理论存在局限性;不同钻孔深度及不同结构类型煤体的钻屑混合是K1值测试结果偏离真实值的原因之一;煤样暴露时间越长,K1值测试结果与实际偏离越大。研究成果揭示了构造煤发育区“低指标突出”现象的技术原因,可为煤与瓦斯突出预测技术的改进提供技术支撑。

     

    Abstract: This paper focuses on revealing the technical reason of the phenomenon that coal and gas outburst occurred frequently in low index with K1 value in tectonic coal developed area.Drilling cutting gas desorption index K1 of the working face was tracked and tested using laboratory tests on coal samples of both tectonic coal and original coal.It is found that the drilling cutting gas desorption index (K1) of the tectonic coal is significantly higher than that of the original coal under the same adsorption equilibrium pressure.The value of K1 is proportional to the development degree of the tectonic coal.The initial characteristics of gas emission in tectonic coal were also studied using constant temperature gas emission experiments.Based on the test results,the technical reasons for the deviation of the K1 measurement were analyzed.The results show that the Barriar formula has limitations in calculating K1.The drill cuttings mixing of different drilling depths and different structural types is an important reason that cause deviation of K1 from the actual value.The longer coal sample exposure time is associated with greater deviation between the tested K1 value and the actual value.This research will provide technical support for the improvement of coal and gas outburst prediction technology.

     

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