Study on the supporting technology and fast drifting in large section roadway of extra thick coal seam

Based on the analysis of the geology and production conditions of the large section roadway of extra thick coal seam in Longwanggou Coal mine, the key points of supporting of the large section roadway of extra thick coal seam are analyzed. According to the geological conditions and the key points of supporting, the supporting principle of fast drifting is put forward, and the equipment of fast drifting is selected. By means of theoretical calculation and numerical simulation, a variety of supportings are compared, and the best supporting design and construction scheme for the transportation roadway of 61612 working face is put forward. The underground application shows that the fast drifting equipment and the supporting design and construction scheme cooperate well to realize the fast drifting and supporting greatly improve the drifting speed. The result of monitoring shows that the supporting effect of large section roadway in extra thick coal seam is very good.