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  Study on the Monitoring Systemof Observing the Shape andReduc ingthe Riskof

  The development of a monitoring system about the stability of tunnel face is an urgent issue because of the problem of occupational accidents caused by "rock fall" which is a collapse of rock near the tunnel face immediately after excavation. In this study, we challenge to prevent damage caused by rock fall by collecting information on the tunnel face using various sensors and evaluating the risk of rock fall based on this information. We focused on the overhang of the surface of tunnel face and tried to identify the overhang area by using photogrammetry and 3D sensor equipped with Lidar technology.

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