Mizunami Underground Research Laboratory Project; Rock mechanical investigations annual report for fiscal year 2010

Tanno, Takeo; Hikima, Ryoichi; Sanada, Hiroyuki; Matsui, Hiroya ; Sato, Toshinori  

Japan Atomic Energy Agency at Tono Geoscience Center is carrying out geoscientific research in the crystalline rock environment at the Mizunami Underground Research Laboratory, in order to establish the scientific and technological basis for geological disposal of HLW. The geoscientific research at the MIU is being carried out in three overlapping phases; the Surface-based Investigation Phase (Phase I), the Construction Phase (Phase II) and the Operation Phase (Phase III). This report presents the following FY2010 activities. (1) Stress Measurements using Core-based Methods on the -300 m Stage, (2) Determining the rock properties using waste rock from exacavation of the ventilation shaft, (3) Development of rock mechanical model (4) Study on the modeling based on equivalent continuum model, (5) Phenomenological study on long-term behavior, (6) Theoretical study for estimating long-term behavior, (7) Example overseas research for planning of experiments in Phase III, (8) Application of specific energy for evaluation of rock mass properties, (9) Study on estimation of rock stress with results of various measurements