Abstract
Some mountain tunnels suffer from deformation and cracks caused by earth pressure. This deformation might progress along with the time passage for some tunnels. Because of uncertain points of such time-dependent deformation and destruction behavior of a mountains tunnel, a maintenance management method has not yet been established currently. In this study, we focused on tunnels deformed due to earth pressure, and tried to apply a numerical analysis using the ground strength reduction model to them. As the result of the study, we have mainly obtained four outcomes. Firstly, we realized to simulate the behavior of tunnels deforming as time goes by. Secondly, by choosing appropriate ground strength reduction curve, we could express wide-ranging progress of displacement. Thirdly, we could evaluate the effect of countermeasures for deformation appropriately. Last, we could determine the most appropriate time for carrying out the countermeasures.
