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为了解决某矿3405综采工作面在“U+L”型通风系统条件下回风巷及上隅角瓦斯经常超限的问题,建立了该综放面在“U+L”型和“U+U”型通风系统下的物理模型和数学模型,对比模拟结果分析了2种通风系统下采空区沿工作面推进方向、工作面宽度方向和垂直方向的瓦斯分布规律。数值模拟和对改造前后对34052回风巷、34053回风巷及上隅角瓦斯浓度监测表明“U+U”型通风系统有效地保证了回风巷及上隅角瓦斯浓度处于低位,保证了工作面安全回采。
In order to solve the problem that the gas return roadway and gas in the upper corner often exceed the limit under the condition of “U + L ” type ventilation system in a mine 3405 fully mechanized mining face, this fully mechanized caving face is established in “U + L” Type and U + U type ventilation system, and compared with the simulation results, analyzed the gas distribution law along the working face advancing direction, working face width direction and vertical direction under the two kinds of ventilation systems . Numerical simulation and monitoring of 34052 return airways, 34053 return airways and gas concentrations in the upper corner before and after the retrofit showed that the “U + U” type ventilation system effectively ensured that the return airways and gas concentrations in the upper corner were at a low level, Ensure the safe mining face.