Comprehensive treatment and effect analysis of gas pressure relief in composite goaf
In order to solve the key problem of large gas emission caused by secondary pressure relief of mining overburden,taking the 2307 lower working face and 2307 upper goaf project of Sihe Coal Mine of Jinneng Group as the research object,the paper analyzed the working face layout and gas migration mechanism,and put forward the gas comprehensive control technology of"parallel drilling+strike drilling+upper corner pipe laying+air drainage".After taking measures,the gas concentration in the return airway was 0.5%on average,meeting the re-quirements for normal mining of the 2307 lower working face and effectively ensuring the safe mining of the working face.
gas pressure reliefclose range coal seamfracture evolutiongas extractionhigh level drillingreturn air gas