土被りの浅いNATMトンネル周辺地盤の数量的変形挙動評価に関する一案

抄録

This paper tries to find how the difference of strain softening characteristics influences the deformation mechanism of ground around shallow non-supported tunnel by numerical analysis. The results show that it is possible to evaluate the onset and progress of deformation mode to collapse by a common criterion. This implies even if the details of strain softening characteristics are not known completely, the outline of deformation mechanism can be defined with ease, which provides useful information for field engineers.