Abstract
Some mountain tunnels suffered from ground heaving require some countermeasures in service, but these designs often depend on empirical methods. Therefore, reasonable countermeasures against heaving become a significant problem. In this study, swelling is focused on as the mechanism of ground heaving, and the model experiment and numerical analysis that express swelling are carried out. As the result, the model test can simulate the heaving phenomenon which progress as time goes on, and it is confirmed that downward rock bolts curb the heaving by the effect of stiffness improvement of tunnel structure. Additionally, the effect of downward rock bolts specifications such as the number of bolts, their diameter, length and the value of prestress are estimated quantitatively.
