山岳トンネル (13)

[VI-306] Stability measures during tunnel excavation in vulnerable ground with small overburden

*Toranosuke Ookubo¹, Akihisa Takahasi¹, Kensuke Toriyabe¹, Shiniti Takakuwa², Tomie Shinotou² (1. TAISEICORPORATION, 2. Ministry of Land, Infrastructure, Transport and Tourism. Kanto Regional Development Bureau.)

Keywords:mountain tunnel, small overburden, auxiliary construction method, early closure, upper half tentative invert