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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。
Tectonic coal is a prerequisite for coal and gas outburst. According to different positions of tectonic coal in coal seam, a numerical experimental model of tectonic coal seam with coal and gas outburst was established. Numerical experiments were carried out by using RFPA2D to analyze the effect of coal seam and gas outburst during the excavation of working face with tectonic coal stratification developed along coal seam in terms of stress and strain, damage distribution, gas pressure and gas gradient. The numerical results show that the structural coal seams in the coal seam affect the initial conditions of coal and gas outburst and are the key layers of coal and gas outburst. Research and analysis suggest that the formation of coal seams does not affect the distribution of gas occurrence and distribution in the original coal seam but determines the main body and initial burst strength of induced coal and gas outburst. The key point to induce coal and gas outburst lies in the high gas pressure gradient in the structural coal seam.