Analysis on distribution features and key parameters of oxidation zone in goaf of gob- side entry retaining

in order to prevent and control coal spontaneous combustion in goaf of gob- side entry retaing,t he seepage law oxceaton zone distributon and key parameters aff cting to oxdation zone scope were studied. Anmuiti- physic fied coupling dynanic mocdel o cal spontaneous combustion was estabished. Taking typical coalmining face as example the paper analyzed caing distrbution features of coal and rock in goaf of gob- side entry retaining and put forward relevant pore rate ditibution mode. A comparison between the soltion results and site measurements was conducted. The caculaton resuts showed when that the thickress of stowing wall ange from 1 ~ 4 m,the thickress ould have less infuence to oxdation zone scope,.but the permeability of wall would have obvious infuence to oxcdatio zone scope. The permeablit varied from 10-12m2 to 10-9m2. The max wide scape of oxdation zone vaied from 6D m to 105 m and the area would be steadily increased.When the pemeability of neighoring goaf was higher than 10-8m2,the oxcdation zone scope of one side nearthe neighboring goaf ould be increased obviously.Therefor, the leakage sealing and reinforcement of stowing walls in intake airiay and return airvay would be efe ctive measures to reduce the danger rea of coal spontaneous combustion in goaf.