山岳トンネル (7)

[VI-775] Tunnel deformation and countermeasures in the autobrecciated lava of andesite in the deep part of the ground

*daisuke nakanishi¹, syunnya hukui¹, tihiro ueda², shigeharu kodaka² (1. HAZAMA ANDO CORPORATION, 2. Ministry of Land, Infrastructure, Transport and Tourism)

Keywords:Deep ground, Andesite, autobrecciated lava, Weak ground, Tunnel deformation