| According to the corresponding requirements in the control of the coal and gas outburstprovisions, combine the physical conditions of Hongyang NO.2mine, NO.7coalseam is adoptedas the protective layer of NO.12coalseam. By means of data analysis and practicalmeasurements, due to the influence of mining, the pressure relief gas flock into NO.7coalseam.About10m~3/s pressure relief gas upwelling to NO.7coalseam to discharge. After mining NO.7coalseam, NO.12coalseam can obtain preferable pressure relief and protective effect.The laws of gas emission during mining of1201working face and3701working face inwest NO.2mining area are analyzed. A series of relations are obtained, such as the relation ofabsolute gas emission quantity with the advance progress of the working face, the relation ofdaily production and gas concentration in return airflow with the advance progress of theworking face, the relation of relative gas emission quantity with the advance progress of theworking face. To verify the veracity of the above laws, the coalseam gas parameter testing workis done. The coalseam gas parameter testing mainly include coalseam gas pressure, coalseam gascontent, gas radiation initial velocity, consistence coefficient value of coal, proximate analysisand sorption constant determining. |
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