山岳トンネル (4)

[VI-259] Three-dimensional grasp of the state ahead of tunnel face in the portal with the crush zone

*Keita Kitano¹, Hisashi Tanaka¹, Kazuki Fujihara¹, Junichi Hirano¹, Atsushi Sera¹, Yuichi Kodama² (1. KONOIKE CONSTRUCTION CO.,LTD., 2. Ministry of Land, Infrastructure, Transport and Tourism Kinki Regional Development Bureau)

Keywords:mountain tunnel, crush zone, water inflow into a tunnel abruptly, entrance of tunnel, state ahead of tunnel face