构造煤层位对煤与瓦斯突出的影响数值分析

Numerical Analysis for the Relationship of Tectonic-coal Layer's Horizon in Coal and Gas Outburst

构造煤是煤与瓦斯突出的必备条件。根据构造煤在煤层中的不同位置,建立了煤与瓦斯突出的构造煤层位数值实验模型。利用RFPA2D对数值模型进行了数值试验,从应力应变、破坏分布、瓦斯压力和瓦斯梯度变化等方面分析了顺煤层发育的构造煤分层在工作面掘进过程中诱发煤与瓦斯突出的作用。数值试验结果表明煤层中的构造煤层位影响着煤与瓦斯突出的始发条件,是煤与瓦斯突出的关键层。研究分析认为构造煤层位并不影响原始煤层瓦斯赋存分布规律,但是决定了诱发煤与瓦斯突出的主体和始突强度,诱发煤与瓦斯突出关键在于构造煤层内的高瓦斯压力梯度。

Deformed - coal is the necessary condition in coal - gas outburst. Establishing the critical layer models of coal - gas outburst according to deformed - coal in different horizon. Analyzed the key role of deformed - coal with RFPA2D to cause coal - gas outburst back and forward in the development roadway from stress and strain, damage distribution and stress of gas to gradient changes of gas. The simulation results showed that deformed - coal layer＇s horizon of coal seam influence the condition of coal - gas outburst. We also demonstrated that the deformed - coal layer＇s horizon have no affect the rule of methane occurrence in original coal seam, however, it determined the main part and beginning strength of coal - gas outburst, the high gas pressure gradient in deformed - coal is the key factor in coal- gas outburst.