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Yamamoto, Nobuyuki; Iwano, Keita*; Namikawa, Tadashi*; Morikawa, Seiji*; Seno, Shoji*; Tabei, Kazuto*; Toida, Masaru*; Yokota, Hideharu
JAEA-Research 2013-003, 252 Pages, 2013/06
JAEA-Research-2013-003.pdf:77.85MB
This study reconsiders rock's mechanical and hydrological parameters based on additional 
data given in this year, and conducts the mechanical-hydrological analysis using the Micromechanics-Based Continuum (MBC) model which can consider the behavior of fracture. The acquired analysis results are compared with actual test data such as drift convergence and hydraulic pressure around the drift. Then, following knowledge is obtained.
Seno, Yasuhiro; Nakama, Shigeo; Sato, Toshinori*; Mori, Takayuki*; Morikawa, Seiji*; Tabei, Kazuto*; Suyama, Yasuhiro*; Murakami, Koji*
JAEA-Research 2007-080, 112 Pages, 2008/01
JAEA-Research-2007-080.pdf:8.37MB
A 3D MBC(Micro-mechanics Based Continuum model) numerical analysis was carried out to predict the rock mass behavior of the complex (articulated) section at -500 m. Properties were chosen based on the Rock Mechanics Model constructed in the Surface-based Investigation Phase (Phase I).
Mori, Takayuki*; Morikawa, Seiji*; Tabei, Kazuto*; Iwano, Keita*; Nakajima, Makoto*
JNC TJ7400 2005-080, 216 Pages, 2005/03
JNC-TJ7400-2005-080.pdf:35.16MB
As a first step of Mizunami Underground Research Laboratory Plan (MIU plan), through the laboratory and borehole in-situ tests, JNC Tono Geoscience Center plans to constitute the comprehensive geological model and predicts the rock behaviors in excavating the shaft and gallery. These model and results leads to be reflected by the next step research projects.So far, the first step of MIU plan is coming to final stage, and the second step will start at next year in which the in-situ researches are planned through the excavation. In this study, the comprehensive geometrical model was drawn out through the first step data, and MBC model analysis was carried out to predict the rock mass behavior around the shaft and gallery. The following results are obtained. (1) With MIZ-1 borehole core, artificial joints, which are assumed to be produced by rock blasting, were formed through the Brazilian test. And through the rock shear test for these joints, these mechanical properties were obtained. (2) By examining the MIZ-1 borehole research data, Mizunami site was classified by mechanical and joint properties and the Geomechanical model were made up. (3) Through the MBC model, the shaft and gallery cases were analyzed which depend on the rock mass classification, Excavation Damaged Zone, and the direction of the galleries. These results showed that in most cases, the joint opening were little because of the rock stiffness, but by the existence of high inclined joints, the side wall of the galleries were damaged by the excavation.
Mori, Takayuki*; Morikawa, Seiji*; Tabei, Kazuto*; Iwano, Keita*
JNC TJ7400 2004-006, 58 Pages, 2004/02
JNC-TJ7400-2004-006.pdf:9.51MB
JNC Tono Geoscience Center planed a comprehensive geoscientific research program for the construction of an underground research laboratory in order to conduct the research and evaluation of geological environment. So far, based on mechanical data from 1,000-m borehole tests, several numerical analysis models, which consider the behavior of joints in a rock mass, have been applied to this site, and the discontinuous rock behavior around the shafts and galleries has been predicted.However, none of these analyses considered the "Excavation Damaged Zone". In this study, in order to grasp the extent of the Excavation Disturbed Zone, MBC analysis considering the Excavation Damaged Zone was carried out and the following results were obtained. 1.Using several parameters relevant to the rock and joints, a parametric study was performed to verify the effect on and sensitivity of the behavior of the Excavation Disturbed Zone. The results showed that joint frequency and Young's modulus of the rock were much effective parameters. 2.Based on the parametric study, several analyses for shaft and gallery were conducted. As the joint density increased and the area of the Excavation Damaged Zone expanded, the joint opening area increased and the equivalent shear stiffness decreased. 3.Two contrasting cases were also analyzed: one was assumed that pre-existing joints progress in the Excavation Damaged Zone, and the other assumed that joints tangential to the excavation wall are generated in the Excavation Damaged Zone. It was found that Excavation Damaged Zone tends to be larger in the former case than the latter case. 4.From these results, prediction analysis for Excavation Disturbed Zone considering the Excavation Damaged Zone was found to be practical. Through the in-situ monitoring data for shafts and galleries, the validity of these analyses will be verified.
Okutsu, Kazuo*; Morikawa, Seiji*; Takamura, Hisashi*; Hane, Koji*; Tabei, Kazuto*; Sahara, Fumihiro*; Murakami, Takeshi*
JNC TJ8400 2003-050, 140 Pages, 2003/02
JNC-TJ8400-2003-050.pdf:3.13MB
The system development for evaluating long-term alteration of hydraulic field in Near Field was examined.
Okutsu, Kazuo*; Morikawa, Seiji*; Takamura, Hisashi*; Hane, Koji*; Tabei, Kazuto*; Sahara, Fumihiro*; Murakami, Takeshi*
JNC TJ8400 2003-049, 265 Pages, 2003/02
JNC-TJ8400-2003-049.pdf:7.88MB
The system development for evaluating long-term alteration of hydraulic field in Near Field was examined.
Takachi, Kazuhiko; *; Tabei, Kazuto*; Noda, Masaru*; *; *
Saikuru Kiko Giho, (5), p.27 - 36, 1999/12
None
Hane, Koji*; Onoe, Hironori*; Ishibashi, Masayuki*; Tabei, Kazuto*; Namikawa, Tadashi*; Tagawa, Yoichi*; Saegusa, Hiromitsu*; Ishida, Keisuke*; Fujisaki, Kiyoshi*; Sawada, Atsushi
no journal, ,
no abstracts in English
Onoe, Hironori*; Ishibashi, Masayuki*; Esaki, Taichi*; Tagawa, Yoichi*; Tabei, Kazuto*; Namikawa, Tadashi*; Hane, Koji*; Saegusa, Hiromitsu*; Ishida, Keisuke*; Sawada, Atsushi
no journal, ,
no abstracts in English
Ishibashi, Masayuki*; Onoe, Hironori*; Esaki, Taichi*; Tagawa, Yoichi*; Tabei, Kazuto*; Namikawa, Tadashi*; Hane, Koji*; Saegusa, Hiromitsu*; Ishida, Keisuke*; Sawada, Atsushi
no journal, ,
no abstracts in English
Namikawa, Tadashi*; Onoe, Hironori*; Esaki, Taichi*; Hane, Koji*; Tagawa, Yoichi*; Ishibashi, Masayuki*; Tabei, Kazuto*; Saegusa, Hiromitsu*; Ishida, Keisuke*; Sawada, Atsushi
no journal, ,
no abstracts in English
Tagawa, Yoichi*; Onoe, Hironori*; Esaki, Taichi*; Hane, Koji*; Ishibashi, Masayuki*; Namikawa, Tadashi*; Tabei, Kazuto*; Saegusa, Hiromitsu*; Ishida, Keisuke*; Sawada, Atsushi
no journal, ,
no abstracts in English
Hane, Koji*; Onoe, Hironori*; Ishibashi, Masayuki*; Esaki, Taichi*; Tagawa, Yoichi*; Tabei, Kazuto*; Namikawa, Tadashi*; Saegusa, Hiromitsu*; Ishida, Keisuke*; Sawada, Atsushi
no journal, ,
no abstracts in English
