Study on air leakage law and gas extraction effect of"high drainage roadway+Y-type ventilation"working face
LI Huhu
LI Yucheng
YANG Xuelin
ZHANG Huan
LI Kunzhao
WU Yanan
Abstract：In recent years,the gas control method of"Y-type ventilation+high drainage roadway"has been widely used with its su-perior control effect.Affected by the negative pressure of high extraction roadway,the air leakage law of working face is more com-plicated,which affects the effect of gas extraction.Taking Yuwu Coal Industry as the engineering background,Comsol software is used to simulate the air leakage law and gas extraction effect of different extraction positions and extraction negative pressure condi-tions of high extraction roadway,and the optimal layout position and extraction negative pressure of high extraction roadway are de-termined and verified on site.The results show that the negative pressure of extraction has a significant effect on the air leakage of the working face.When the negative pressure of extraction is 0 kPa,the airflow field in the goaf is fan-shaped,and deflects from the working face to the direction of gob-side entry retaining.With the increase of extraction negative pressure,the goaf in the range of 260-328 m of the working face tends to form a negative pressure interception effect,and a triangular reflux area is formed inside the goaf on the side of the gob-side entry retaining.The location of the high drainage roadway and the change of the negative pressure of the drainage mainly affect the air leakage wind speed in the 170-328 m area of the working face and the 0-140 m area of the gob-side entry retaining.The air leakage and gas extraction parameters of high extraction roadway under different extraction conditions are comprehensively compared and analyzed.When the extraction negative pressure is 11 kPa,the extraction position is 30 m hori-zontally and 35 m vertically,the gas extraction effect is the best.The field measured wind speed and gas concentration are consistent with the numerical simulation results.
Keywords：high-extraction roadway+Y-type ventilationair leakage velocitygas extractionextraction negative pressureextrac-tion location
Publication Date：2025-09-30
Online Publishing Date：2025-09-12(First online date of this platform, not the publication date of the document)
Pages：11( 134-144 )