多场耦合作用下煤与瓦斯突出机理分析

Analysis on Coal and Gas Outburst Mechanism Under Multi Field Coupling Action

为预防煤与瓦斯突出的发生,研究了煤体中裂隙的产生扩展及裂隙产生扩展时引起的振动、电磁辐射和渗流变化的机理,并从振动场、电磁场、应力场、渗流场的耦合角度对一起煤与瓦斯突出事故的发生原因进行了分析。结果表明:煤与瓦斯突出的发生过程是煤体裂隙产生并快速发展的结果,在裂隙的产生过程中必然产生相应的振动场和电磁场,而裂隙的产生扩展以及振动场、电磁场同时又将使煤体内的应力场和渗流场发生变化,这些场综合作用将使含瓦斯煤体裂隙快速扩展、贯通,最终形成大量的宏观裂隙致使含瓦斯煤体突发性失稳破坏,导致煤与瓦斯突出的发生,即振动场、电磁场、应力场、渗流场的综合作用最终导致了煤与瓦斯突出的发生。

In order to prevent the coal and gas outburst occurred,the paper had a study on the vibration,electric magnetic radiation and vadose variation mechanism occurred when the expansion caused from the cracks in the coal mass as well as the expansion occurred from the cracks.Also from the coupling review of the vibration field,the electric magnetic field,the stress field and the vadose field,the paper had an analysis on the cause to occur the coal and gas outburst.The results showed that the coal and gas outburst occurred process would be results of the cracks occurred and rapid developed in the coal mass.During the crack occurred process,the related vibration field and electric and magnetic field would be inevitably occurred.The cracks occurred and expanded as well as the vibration field and the electric magnetic field could cause the variations of the stress field and the vadose field in the coal mass.The comprehensive effects of those fields would make the cracks of the gas content coal mass to be rapidly expanded and connected.Thus the great macroscopic cracks finally formed would cause the stability of the gas content coal mass to be suddenly lost and failure and could cause the coal and gas outburst occurred.Thus the comprehensive roles of the vibration field,the electric magnetic field and vadose field would finally cause the coal and gas outburst occurred.