Preliminary analysis of long-term evolution for geological environment around drift in the Horonobe Underground Research Laboratory

Goke, Mitsuo*; Okihara, Mitsunobu*; Maemura, Tsuneyuki*; Yasuda, Ryo*; Matsui, Hiroya ; Ozaki, Yusuke  ; Mochizuki, Akihito  

We performed the numerical simulation to simulate the long term change in geological environment under open drift condition. We developed the conceptual model for the purpose and performed the geomechanical and hydrological simulation with the models considering the existence of excavation damaged zone and tunnel support. The geomechanical simulation results suggested that the deformation for long term is so slight that the excavation damaged zone does not enlarge. The hydrological simulation considering the degassing predicted the expansion of the unsaturated zone in the high pore pressure domain.