Mizunami Underground Research Laboratory Project; Rock mechanical investigations annual report for fiscal year 2013

Sato, Toshinori  ; Sanada, Hiroyuki; Tanno, Takeo*

This report presents the results of following rock mechanical investigations conducted in FY 2013. In-situ stress measurements using Compact Conical-ended Borehole Overcoring Technique were performed at the - 500m stage. Measurement system for rock mass displacement using optical fiber was installed at the - 500m stage as one of the reflooding test. Study on the modeling based on equivalent continuum model was continued. Phenomenological study and theoretical study on long-term behavior of crystalline rock were continued. Additionally, joint research, "Study on estimation of in-situ rock stress based on the results of various measurements" with Tokai University was also performed.