DOI: 10.11799/ce201803003
Position arrangement of high level gas drainage roadway and investigation on the gas drainage effect in Zhaozhuang Coal Mine
GAO Hong
Abstract：In order to solve the problems in the process of gas drainage in 3# coal seam of 1307 worLing face in Zhaozhuang Coal Mine, including difficulties of drilling, hole-forming and pre-drainage, and the low concentration of gas drainage, in earlier stage, the gas control method of"three air intaLes and two air returns"was used, which can easily lead to slow driving progress and serious imbalance between mining and excavation. Through FLAC3Dnumerical simulation, the author analyzed the stress and displacement of different high drainage roadway placement position, and concluded the optimal placement position of high drainage roadway. The"U-type ventilation+high drainage roadway"gas control method was adopted. The author analyzed the drainage effect of the high drainage roadway in different mining stages from the aspects of the placement position, pure quantity of drainage, drainage negative pressure and the drainage concentration. The results show that, when the distance between the high drainage roadway and the roof of 1307 worLing face is 43~51m, the gas drainage is the best, which effectively reduces the gas concentration in the upper corner of worLing face, and the corresponding drainage negative pressure is 12~15LPa.
Keywords：high drainage roadway positionnumerical simulationdrainage negative pressurepure quantity of drainagedrainage concentration
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 8-11 )