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分析了杨柳矿突出危险煤层10414首采工作面的地质特征,借鉴围岩裂隙场和采空区瓦斯流动场的变化规律,建立了CFD模型对采空瓦斯分布规律、埋管抽采效果、埋管与高位钻孔同时抽采效果进行模拟研究,并在10414工作面进行工程验证。结果表明:采空区瓦斯主要聚集在回风巷一侧,为判别采空区瓦斯高效抽采范围提供依据;50 m埋管与高位钻孔同时抽采时,上隅角瓦斯浓度降至0.5%,工作面不存在瓦斯超限现象;工程实践中可联合抽采40%的瓦斯,瓦斯纯量高达12.5 m~3/min,可见采空区瓦斯抽采在突出危险煤层应用中具有较好的实践效果。
The geological characteristics of the 10414 first coal mining face of the prominent dangerous seam in Yangliu Mine are analyzed. The variation law of gas flow field in the surrounding rock fissure and the goaf is analyzed. The CFD model is established for the distribution of the mined gas, the effect of the buried pipe, Pipe and high drilling at the same time pumping effect simulation study, and 10414 face validation. The results show that the gas in goaf mainly collects on the side of return airway, which provides a basis for judging the effective gas drainage area of mined-out area. When the 50 m buried pipe and high-level borehole are drained at the same time, the gas concentration in the upper corner is reduced to 0.5 %, There is no gas overrun phenomenon in the working face; 40% of the gas can be extracted in engineering practice, and the gas purity reaches as high as 12.5 m ~ 3 / min. It can be seen that the gas drainage in the goaf is preferable in the application of the prominent dangerous coal seam The practical effect.