Abstract：
The construction of the exposed coal seam at the exit of the Xiongdongwan tunnel is a source of significant risk regarding the construction of this tunnel. There are 5 coal seams totaling 8 coal lines, with the C5 coal seam being the most dangerous one. Based on construction experiences with previous coals seams, advance drilling was used to explore the coal seam at the exit of the Xiongdongwan tunnel and the construction of the exposed coal seam was undertaken in strict accordance with relative technical proposals and ultimately passed smoothly through the C5 coal seam.
2012, Vol. 49 