山岳トンネル(11)

[VI-679] Application examples of tunnel face collapse detection system to constant face monitoring

〇Daisuke Fujioka¹, Kenichi Nakaoka¹ (1.OBAYASHI CORPORATION)

Keywords:Mountaion Tunnel, Tunnel face monitoring, Image processing, Background difference method, Labor accidents due to rock fall event

Tunnel face monitoring is essential to prevent labour accidents due to rock fall event. But it has been difficult to visually grasp all of the face changes. Therefore we have developed the face collapse detection system that can detect falling rocks in real time, and have been operating it in conjunction with visual monitoring by face observers. As a result of applying the face collapse detection system at the two sites as a constant monitoring of rock face, no rock fall occurred. Since it was possible to detect the drop of spring water that behaves the same as the rock fall, it was found that it is a high possibility that it can be detected normally even when a rock fall occurs.