Preliminary validation of a rock mechanical conceptual model developed during the surface-based investigation phase in the Mizunami URL project

Matsui, Hiroya; Hirano, Toru

Dai-39-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.48 - 53, 2010/01

JAEA (Japan Atomic Energy Agency) has been performing studies to provide the scientific basis for understanding of geological environments. This report attempts the initial validation of the rock mechanical conceptual model of crystalline rock established in the surface-based investigation phase (Phase I) in the URL project. A variety of laboratory tests and in situ stress measurements were carried out in niches. The interpreted information was compared to the conceptual model. The results indicate that the predicted distribution of rock properties and in situ stress state are generally in agreement down to 300 m depth but predictions of fracture geometry are needed to improve the accuracy of the model.