Study on an equivalent continuum model at the Mizunami Underground Research Laboratory

Tanno, Takeo; Sato, Toshinori  ; Matsui, Hiroya ; Sanada, Hiroyuki; Kumasaka, Hiroo*; Tada, Hiroyuki*

The Japan Atomic Energy Agency (JAEA) is conducting the MIzunami Underground research laboratory (MIU) project in order to develop comprehensive geological investigation and engineering techniques for deep underground applications (e.g. geological disposal of HLW). This modelling study has a two-fold objective, to contribute to the evaluation of the mechanical stability of shaft and research drifts, and to plan the future studies. A crack tensor model, a method of an equivalent continuum model, has been studied at the MIU. In this study, the relationship between the estimated crack tensor parameters and the rock mass classification was revealed.