Application of Directional Drilling of Oblique Guide Hole to Inclined Shaft with Large Dip Angle Constructed by Raiseboring Method

FEI Wantang, MA Yufeng, LIU Zhiqiang, LIU Shujie, LIU Shuanghua, LONG Xiaogang, DONG Yuntao

Tunnel Construction . 2018, (11): 1853 -1859 . DOI: 10.3973/j.issn.2096-4498.2018.11.014