山岳トンネル(2)

[VI-408] Investigation of rock fall risk around the tunnel mouth and selection of countermeasures

〇Iori Takizawa², Hayato Tobe², Shin Kageyama², Toshiharu Ishii², Tetsuya Hikida², Seigou Takashita¹, Hiroki Sugawara¹ (1.West Nippon Expressway Company Limited, 2.Kajima Corporation)

Keywords:rock fall, geological survey, countermeasures of rock fall