顶板垮落诱发瓦斯灾害的理论分析

利用热力学、摩擦学、燃烧学等原理，研究了岩石摩擦、撞击过程中的能量转化关系及岩石表面升温机理，建立了岩石升温的数学模型，分析了引起瓦斯燃烧的条件，得出了岩石摩擦、撞击过程中引起表面升温的主要因素为岩石相互作用的摩擦生热、岩石变形引起的应变能升温和岩石破坏释放能量升温．研究表明：岩石碰撞升温通过热对流作用引起周围瓦斯-空气混合气体的温度升高，如果瓦斯-空气混合气体原始温度上升到瓦斯着火温度，时间大于瓦斯爆炸的感应期，就会引燃引爆瓦斯．

Theory Analysis of Gas Hazard Incident Caused by Roof Caving

The principle of thermodynamics,tribology and combustion theory was used to analyze and explore the mechanism of rock mass surface heating-up and the relationship of energy transformation in the process of rock mass's friction and crash.The mathematical model of rock mass surface heating-up was established and used to analyze the gas combustion factors,showing that the main factors for heating-up rock mass surface are crash,friction,strain and failure of rocks.The results show that the thermal interaction caused by heating-up of rock collision may lead to a rise of temperature of gas and air mixture.When the initial temperature of gas and air mixture reach the ignition point and the time is longer than sensitive period of gas explosion,then the gas explosion may occur.