Research and application of shrinkable pier reinforcement technology in Wutongzhuang mine

With the background of the pier-type retaining road along the Wutongzhuang mine as the background, in order to solve the problems of insufficient support strength of the shrinkable pier column, the stiffening and strengthening measures of the pier column are determined through laboratory tests and theoretical analysis.and the mechanical properties of the shrinkable pier before and after stiffening is simulated by ANSYS software, and combined with field application to verify the feasibility and effect of the stiffening technology.The results show that the failure mode of the pier column is that the bending deformation of the middle joint is large, which is easy to cause local instability, and the drum is broken at the bottom.The reinforcing deformation of the stiffener in the middle of the pier can reduce the bending deformation by 75%, only slight bending deformation; after the bottom of the column is welded with the stiffening ring, the drumming phenomenon of the column foot is significantly reduced, and the drum deformation is hardly occurred.Field application shows that the pillars after reinforcement can play a good supporting role and meet the mine production requirements.