Abstract: Based on the engineering background of the auxiliary shaft of Shihao mine of Henan Da- you Energy Co Ltd, by field investigation and research, deformation and failure features and damage reasons of deformation zone in mine shaft have been analyzed, by using FLAC3D numerical simulation software, the stress distribution and the plastic zone size inside of rock pillars on both sides of shaft and the displacement variation rule of shaft lining on side of two rock pillars have been studied under the different pre-tightening force of anchor rope. The research results show that under the action of the strand anchor, as the pre-tightening force of anchor cable is increasing, vertical stress within the rock pillars will increase, while the plastic zone size and the shaft displacement after reinforcement will decrease. Self-supporting ability and stability of shaft lining surrounding rock are effectively improved by the action of high pre-tightening force of the strand anchor. Full grouted anchor cable can effectively reduce the post loss of anchor pretightening force, and then the wall rock stability is enhanced. This numerical simulation results were better validated by shaft lining surrounding rock deformation measured results. The research results provide important references for treatment rupture of the shaft lining under similar conditions.

Key words: complex stress, shaft lining, deformation features, numerical simulation, strand anchor