Monitoring of rock behavior due to shaft excavation using tilt measurements

Nago, Makito*; Ijiri, Yuji*; Kinomura, Koji*; Sato, Masaru*; Shigehiro, Michiko*; Kunimaru, Takanori

Since a geological disposal repository of nuclear waste will be constructed at depth of a few square kilometers and will be operated for a several tens years, it is crusial to develop a long-term monitoring technology of rock behavior of quite large area. For this purpose, a conventional monitoring method needs a number of deep boreholes and thus needs a huge amount of cost. In this paper, the results of tilt measurements for the shaft excavation at the Horonobe Underground Research Laboratory is presented.