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Journal Articles

In situ stress measurement by CCBO in Mizunami Underground Researh Laboratory

Sato, Toshinori; Tanno, Takeo; Sanada, Hiroyuki; Yokoyama, Tatsuya*; Shimoyama, Masahiro*

Heisei-25 Nendo (2013 Nen) Shigen, Sozai Gakkai Shuki Taikai Koenshu, p.257 - 258, 2013/09

Japan Atomic Energy Agency is operating underground research laboratory projects in order to establish a firm scientific basis for safe geological disposal of HLW. One of these is the Mizunami Underground Research Laboratory (MIU) project focused on crystalline rock. In situ stress measurement by Compact Conical-ended Borehole Overcoring (CCBO) are conducted to understand in situ stress state at 300 m depth.

Journal Articles

In-situ stress measurement in the Mizunami Underground Research Laboratory; A New test of strain sensitivity method applying to CCBO

Tanno, Takeo; Sato, Toshinori; Sanada, Hiroyuki; Hikima, Ryoichi*; Yokoyama, Tatsuya*; Shimoyama, Masahiro*

Heisei-25 Nendo (2013 Nen) Shigen, Sozai Gakkai Shuki Taikai Koenshu, p.255 - 256, 2013/09

${it In-situ}$ rock stresses were measured by Compact Conical-ended Borehole Overcoring (CCBO) technique in the 300m depth gallery at the Mizunami Underground Research Laboratory and the measurement results were evaluated using a conventional method and a new test of strain sensitivity method. To compare the ${it in-situ}$ rock stress evaluated by both methods, the new test of strain sensitivity method resulted in more accurate evaluation than the conventional method, because of its improved stress deviations.

Oral presentation

Initial stress measurement by CCBO using a new test of strain sensitivity in the Mizunami Underground Research Laboratory, central Japan

Yokoyama, Tatsuya*; Shimoyama, Masahiro*; Sato, Toshinori; Sanada, Hiroyuki; Tanno, Takeo; Hikima, Ryoichi

no journal, , 

In order to obtain the in-situ stress state around the Mizunami Underground Research Laboratory, we have measured the initial stress state by using the Compact Conical-ended Borehole Overcoring (CCBO) technique in the 300m depth gallery. We newly tried to correct the strain sensitivity with biaxial loading test using the recovered core in the CCBO technique. In this case, we were able to confirm the effectiveness of the correction method in comparison with the results of this analysis newly introduced and the conventional methods.

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