Influence of atmospheric pressure changes on the pressure parameters of goaf
The change of seasons can lead to sudden changes in temperature,affecting changes in surface air pressure.The temperature difference between day and night on the surface is large,and the changes in air pressure are significant.Howev-er,underground temperature and air pressure are basically in a constant state,resulting in a sharp change in pressure differ-ence between the two.The sealing of goaf in mines is influenced by changes in ground atmospheric pressure,which often leads to respiratory oxygen supply,causing gas to overflow from the sealed area and causing gas exceeding limit accidents;Alternatively,after air enters the enclosed area and interacts with the residual coal inside,it spontaneously ignites,causing a fire in the enclosed area.Therefore,the air pressure in the goaf is closely related to the surface atmospheric pressure.This article takes the closed goaf of Dong107 working face in Dashui Coal Mine as the research object.Through analyzing and studying the changes in surface atmospheric pressure and temperature within a day,as well as the changes in air pressure and differential pressure inside and outside the closed goaf,the time pattern of the changes in differential pressure inside and outside the closed goaf is obtained,which can provide application support for the extraction of goaf and the formulation of fire prevention and extinguishing plans.
goafatmospheric pressurepressure differencetemperaturefire prevention and extinguishing
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