基于三维空隙率模型的采空区瓦斯运移及富集规律
Law of gas migration and enrichment in goaf based on three-dimensional porosity model
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摘要: 采空区空隙率分布对采空区流体流动有重要影响，因此基于“O”型圈理论和砌体梁理论提出三维空间上的空隙率分布函数，建立三维渗透率模型，进而以平舒煤矿15111综采工作面为研究对象，模拟研究了重力和采空区平均粒子直径对采空区瓦斯运移及富集的影响规律。结果表明：在考虑重力因素下，采空区瓦斯在上隅角处形成明显“下扎”效果，并使得瓦斯在上隅角积聚；采空区平均粒子直径取值增大，低浓度瓦斯富集区扩大，高浓度瓦斯富集区减小；并通过对比实测数据，发现在考虑重力因素下平均粒子直径设置为0.12 m时更符合实际情况。Abstract: The distribution of porosity in the goaf has an important influence on the fluid flow in the goaf. Based on the O-shape ring theory and the masonry beam theory, a three-dimensional distribution function of porosity was proposed. Based on the 3D porosity model, the effect of gravity and the average particle diameter on the gas migration and concentration in the mining area was simulated and studied in Pingshu 15111 fully mechanized mining face. The gas migration and enrichment regularity with gravity and different average particle diameter values in the caving area are studied. The results showed that under the consideration of gravity, the gas in the mining area formed an obvious “downward tie” effect at the upper corner, and made the gas accumulate at the upper corner. The average particle diameter in the mining area increased, and the low concentration gas enrichment area expanded, and the high concentration gas enrichment area decreased. By comparing the measured data, it was found that, the particle diameter setting of 0.12 m under the consideration of gravity is more realistic.
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