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应用多孔介质流体动力学理论建立了综放采场三维流场数学模型，采用上游加权多单元均衡方法对三河尖煤矿７１２１下综放采场流场的压力和风速分布进行了数值计算，压力分布的计算结果与模型实验实测结果达到较好的吻合；根据７１２１下综放采空区的实测自燃“三带”范围（不燃带７～１４ｍ，可燃带１４～７０ｍ，窒息带大于７０ｍ）确定了该工作面采空区可能自燃带风速范围为０３３～０１２ｍｍｉｎ．
The mathematical model of three-dimensional flow field in fully mechanized sublevel caving face was established based on the theory of hydrodynamics of porous media. The pressure and wind velocity distribution in the flow field of 7121 fully mechanized caving mining face in Sanhejian Coal Mine were calculated by the method of upstream weighted multi-unit equilibrium. The pressure distribution According to the actual measured “three-zone” range (non-combustible zone 7 ~ 14m, combustible zone 14 ~ 70m, asphyxiation zone more than 70m) The gob of the face may be spontaneous combustion zone wind speed range 0 33 ~ 0 12mmin.