煤岩中氢气氦气甲烷释放规律的研究

Research on Emission Regulation of Hydrogen, Helium and Methane in Coal and Rock

根据对各种气体的物理化学性质的比较,在前人探索煤中气体异常释放的基础上,深入研究了氢和氦在煤与瓦斯突出时的预警作用。指出具有较稳定的化学性质及最强的扩散渗透能力的氢和氦在突出过程中起着不同的前兆作用。氦的释放异常反映的是地应力的变化,在应力集中带出现明显的释放异常并随工作面同步推进;氢的释放异常反映的是煤体内部急剧的物理化学变化,是突出的直接反映。而甲烷作为突出的主要产物主要反映了突出的强度。通过综合研究氢气/氦气/甲烷的释放规律,有可能建立一种联测技术有效地预警煤与瓦斯突出。

Based on the comparison of physicochemical properties of various kinds of gas and the previous study of abnormal emission of gas, deep research was made on the pre-warning function of hydrogen and helium in the process of coal and gas outburst. The paper points out that hydrogen and helium having more stable chemical properties and strongest diffusion and permeable ability can play different forewarning roles during coal and gas outburst. The abnormal emission of helium will reflect the variation of strata stress and markedly abnormal emission of helium will appear in the stress concentrated zone and move forward with face advance. The abnormal emission of hydrogen will reflect sharp variation of physicochemical properties in coal body and be a direct sign of coal and gas outburst. Methane, as a main product of outburst, will mainly reflect outburst strength. Therefore, an effective technique for predicting coal and gas outburst can be provided through combined study of the emission regularity of hydrogen, helium and methane.