Abstract：To investigate the process of cover splitting due to corrosion in the anchorage zone of bolts，the dummy radial displacements loaded on the hole in wall of bolts are used to simulate the expansion of corrosion products overlaying above bolts. The dummy displacements can be determined according to the quantity of iron corroded when uniform or nonuniform corrosion occurs to bolts. Then the splitting of the mortar cover due to the corrosion in the anchorage zone of bolts is numerically simulated by use of element Solid65 with the function of cracking based on the smeared fixed crack model in the finite element software ANSYS8.0. By use of an example，it is proved that when the corrosion quantity are equal，the cracks in the mortar cover and the destructive effects are obviously different around bolts uniformly and nonuniformly corroded，so the assumption of uniform corrosion should be adopted with caution in the prediction of time-to-corrosion cracking.
