煤与瓦斯突出流体动力学机理研究

Research on Fluid Dynamics on Coal and Gas Outburst

煤与瓦斯突出是威胁煤矿安全生产的重大灾害,近年来随着对深部煤炭资源需求增加,煤和瓦斯突出次数和强度也日趋严重。运用流体动力学基本原理探讨突出过程中瓦斯气体压强和流速变化,研究表明游离态瓦斯气体在煤岩体内高速流动时产生的压强波可在煤层裂隙网中不断积累传播。而煤层中压强波的出现不仅能够改变裂隙中瓦斯气体流速和压力并扩展煤层裂隙,使含瓦斯煤岩体孔隙结构破坏,最终导致煤与瓦斯突出灾害发生。

This paper is to focus on the transport of coal bed gas within the micro-structure of coal-rock mass, where gas pressure and its flow were analyzed. The results indicate that the movement of gas within micro-crack of coal-rock would be able to result in gas pressure wave, namely shock and expansion wave,whose propagation and cumulative process is attributable to the gas outburst of coal-rock. The changes of gas pressure wave certainly control the gas movement containing gas pressure and flow, which in turn accelerates the propagation and coalescent of crack of coal and then causes the chain interaction of two-phase flow. It is therefore postulated that outburst of coal-gas possibly follows the hypothesis of fluids dynamics.