山岳トンネル(9)

[VI-658] Evaluation of rockfall risk considering geological conditions and thickness of shotcreting to face

〇Daisuke Fukushima¹, Yasuyuki Miyajima¹, Hayato Tobe¹, Yusuke Nishizawa¹ (1.Kajima Corporation)

Keywords:Tunnel, Evaluation of ground condition, Fall of rocks, Logistic regression

The authors have developed a quantitative evaluation technique of weathering and cracks using image analysis of face images and a strength evaluation technique by drilling data , with the aim of preventing rock falling accident . In addition, we have developed a system that sends a signal to the operator when the design thickness of shotcret using a laser distance meter while monitoring and collecting shotcreting data. In this paper, we compare and analyze the ground evaluation data collected with these evaluation techniques from the excavation tunnel and the rock falling situation at the time of blast hole drilling, and evaluate the risk of rock falling using logistic regression.