Research on the influence of surface atmospheric parameters on gas drainage effect in abandoned goaf
To solve the problem of gas accumulation and low drainage concentration in abandoned goaf of low gassy mines,taking the gas pipeline drainage method used in 4204 abandoned goaf of Buertai Coal Mine,a gas drainage volume calculation model based on the"breathing"model of goaf was constructed.The correlation characteristics among surface atmospheric pressure parameters,gas drainage volume and concentration were revealed through theoretical analysis,numerical simulation,and on-site detection methods.The results indicated that the peak and temporal characteristics of gas drainage volume were related to the amplitude and period of atmospheric pressure fluctuations,respectively;the concentration of gas drainage showed a positive correlation with the increase of surface atmospheric pressure,and the shorter the fluctuation period and the larger the amplitude,the more favorable the more concentration gain of gas drainage.On the basis,an automatic control technology for gas drainage in abandoned goaf associated with changes of surface atmospheric pressure parameters had been proposed.Engineering practice had shown that compared with traditional gas pipeline drainage method,the new method had increased the average gas drainage volume and concentration by 30.9％and 37.5％,respectively,with an energy-saving effect of 12.91％.
atmospheric pressurefluctuation periodgas drainageintermittent gas drainageabandoned goaf
万方数据
维普
