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Aoyagi, Kazuhei; Kamemura, Katsumi*; Sugawara, Kentaro*; Hagihara, Takeshi*
Dai-53-Kai Jiban Kogaku Kenkyu Happyokai Happyo Koenshu (DVD-ROM), p.11 - 12, 2018/07
no abstracts in English
; ; *
JNC TY7430 2000-001, 57 Pages, 2000/03
JNC-TY7430-2000-001.pdf:2.17MB
no abstracts in English
*
JNC TJ7400 2000-013, 26 Pages, 2000/02
JNC-TJ7400-2000-013.pdf:1.25MB
no abstracts in English
*
JNC TJ7400 2000-005, 20 Pages, 2000/02
JNC-TJ7400-2000-005.pdf:1.44MB
no abstracts in English
Sato, Toshinori; Taniguchi, Wataru; Fujita, Tomoo; Hasegawa, Hiroshi
JNC TN7400 99-011, 36 Pages, 1999/12
In order to understand the general thermal and mechanical properties of rock masses and initial stress of rock at depth, data were compiled from the published literature in Japan and collected from investigations carried out at Kamaishi mine and Tono mine. Statistical examinations derived the ranges, means and medians of the mechanical properties for the different rock types. It was confirmed that the correlations between the mechanical properties were in agreement with correlations determined previously in other similar surveys. The unconfined compressive strength of Neogene sedimentary rocks showed a tendency to increase with increasing depth (
500 m). An examination of the measured initial stress data collected through literature surveys showed that the vertical stress can be approximated by the extent of gravitational loading at a particular point. There is an approximately linear relationship between the average stress in a horizontal plane and the depth. The lateral pressure coefficient tends to have a high value and large range at shallow depths, but tends towards 
1 with increasing depth.
; *; *; *; ; ; Araki, Kunio
JAERI-M 83-040, 55 Pages, 1983/03
no abstracts in English
Kuwabara, Kazumichi; Sato, Toshinori; Takayama, Yusuke; Tanno, Takeo*; Kato, Harumi*; Itamoto, Masaharu*
no journal, ,
It is very important to understand an initial stress state of the rock mass in doing a design, the construction of large-scale facilities under the ground. Groundwater recovery experiment will be conducted at the MIU GL.-500m closure test drift. This report described what stress measurement were performed by the CCBO (Compact Conical-ended Borehole Overcoring technique) to understand an initial stress state of intact rock and a stress state of the -500m gallery wall surface. As a result, the magnitude of principal stresses were 16.8 MPa, 10.2 MPa and 7.5 MPa. The maximum principal stress level was approximately same at the GL.-500m level. The direction of maximum principal stress is approximately 60
from a horizontal plane. The width of stress redistributed zone was about 2m from the wall of research galleries. Numerical analysis was carried out to examine an outbreak condition of core disking.
Kuwabara, Kazumichi; Ozaki, Yusuke; Matsui, Hiroya
no journal, ,
In the rock mechanical investigations at the Phase II, the research aims at "Characterization of geological environment in the Excavation Disturbed Zone (EDZ)" from the viewpoint of safety assessment. For the research, the specific information of the EDZ such as (1) size and structures, (2) petrophysical/geomechanical properties, and (3) stress state are required. The research also aims at "Characterization of geomechanical stability around tunnel" from the viewpoint of design and construction of underground facilities. For the research, the specific information such as (4) local stress regime, (5) spatial variability of petrophysical/geomechanical properties of rocks, and (6) distribution of discontinuities intersecting underground tunnels are required. The measurement system for rock mass behavior has been manufactured and set for groundwater recovery experiment in the Phase III. This report presents the results of following rock mechanical investigations conducted in FY 2014. In situ stress measurements using Compact Conical-ended Borehole Overcoring Technique were performed at the - 500m stage. Measurement system for rock massdisplacement using optical fiber was installed at the - 500m stage as part of the groundwater recovery experiment.