Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Sato, Toshinori; Sanada, Hiroyuki; Hikima, Ryoichi*; Hirano, Toru*; Yamashita, Masayuki*; Ishiyama, Koji*
no journal, ,
Evaluation of rock properties based on Specific Energy using mechanical data from an excavation machine has been carried out in research gallery at depth of 500m in Mizunami Underground Research Laboratory. This paper describes that Specific Energy will be useful parameter to estimate Excavation Damaged Zone comparing to the results of seismic survey and core logging data.
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.
Takebe, Hiromichi*; Kitamura, Naoto*; Amamoto, Ippei; Kobayashi, Hidekazu; Mitamura, Naoki*; Tsuzuki, Tatsuya*
no journal, ,
no abstracts in English