To obtain the distribution characteristics of the flow field and gas in goaf for different coal seam dip an-gle, by establishing the mathematical physical model of goaf and setting the boundary conditions, the distribution of air pressure, air leakage and gas in the working face and goaf were numerically simulated based on the 22310 work-ing face in NO.6 coal mine of PingMei group, and the simulation results were compared with the field measure-ments of ventilation parameters in this working face to prove the reliability of the mathematical physics model. Then, the distribution characteristics of air pressure, air leakage and gas in goaf were simulated and analyzed with the dip angle of coal seam being 5.75°,35.75°and 65.75°respectively based on the mathematical physics model. By comparing the change rules about the distribution of flow field and gas in goaf, the result showed that, when the dip angle of coal seam increases, the air pressure in goaf decreases and the pressure gradient in goaf increases;the change of air leakage quantity in working face is very small and the distribution laws of air leakage keep steady;the gas concentration and the content of gas in goaf decreases.%为获得不同煤层倾角条件下的采空区流场及瓦斯分布变化规律，以平煤六矿22310工作面为原型，通过建立采空区数学物理模型并设置边界条件，数值模拟了工作面采空区气体压力、漏风和瓦斯分布情况，并与该工作面现场实测通风参数对比，对模型可靠性进行验证。在已建立模型的基础上，模拟了煤层倾角分别为5．75°、35．75°、65．75°时的采空区气体压力、漏风和瓦斯分布，对比分析了三种煤层倾角下的采空区流场及瓦斯分布变化规律。结果表明：随着煤层倾角增加，采空区气体压力降低，压力梯度升高；工作面漏风量变化微小，漏风分布规律不变；采空区瓦斯浓度和采空区瓦斯总量降低。
展开▼
