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Komatsu, Mitsuru*; Nishigaki, Makoto*; Chijimatsu, Masakazu*; Nakama, Shigeo
no journal, ,
no abstracts in English
Kitagawa, Yoshito*; Yamazaki, Masanao; Hagihara, Takeshi*; Minamide, Masashi*; Sekiya, Yoshitomo
no journal, ,
no abstracts in English
Tsusaka, Kimikazu
no journal, ,
no abstracts in English
Kimura, Makoto; Fujita, Tomoo; Sazarashi, Masami
no journal, ,
For the purpose of developing of the coupled Thermo-Hydro-Mechanical-Chemical(THMC) simulation code which is available to the prediction of the salt accumulation/precipitation, a chemical reaction model paid attention to unsaturated buffer material is discussed. In the THMC simulation code, chemical reaction model such as ion-exchange and surface complexation which are based on water-retention form and infiltration history under the unsaturated condition is considered. Some results of THMC simulation against the laboratory test are shown and it is found that mass-transport under the unsaturated/saturated condition is suitable but necessary to consider the change of solid/liquid ratio for the chemical reaction.
Hirano, Toru; Matsui, Hiroya; Kinoshita, Harunobu
no journal, ,
We tried to understand the amount of the total rock deformation and the feature by the strain/displacement measurement during a deep shaft excavation in crystalline rock. For this purpose, the instruments were installed in the vertical boreholes drilled along a shaft before excavation. Then strain/displacement were measured during the excavation. As a result, the large strain/displacement by blasting were measured at 1 or 6 meter far from the shaft wall, Also, the rock behavior was estimated to be elastic approximately based on comparison between measured and theoretical value. Also, damage range of the rock caused by blasting was estimated less 1 meter far from the shaft wall.
Noguchi, Akira; Nakayama, Masashi; Kobayashi, Yasushi; Miura, Norihiko*; Noda, Masaru*; Iriya, Keishiro*
no journal, ,
no abstracts in English
Kuji, Masayoshi*; Asai, Hideaki; Matsui, Hiroya
no journal, ,
Two deep shafts (the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency (JAEA). To estimate the rock mass quality and UCS on shaft wall, existent rock mass classification methods (CRIEPI, RMR and New-JH) and in-situ needle sounding tests were applied in rock. A new quantitative rock mass classification method based on JGS standard was developed. This method showed good suitability to sedimentary rock in the Ventilation Shaft. Afterward, the new method was applied to heterogeneous sedimentary rock in the Main Shaft.
Yamazaki, Masanao; Fukui, Katsunori*; Minamide, Masashi*; Hatsuyama, Yoshihiro*
no journal, ,
The correlation between the energy per unit excavated volume calculated from the electric power consumption of the road header during the shaft excavation and the rock properties observed at the excavation wall was investigated in the Horonobe Underground Research Project. As a result, it was found that the energy per unit excavated volume correlate better with the rock mass classification determined from both a fracture intensity as well as a rock strength rather than with a fracture intensity. We will continue to measure the electric power consumption data in order to establish rock mass evaluation method using the energy per unit excavated volume.
Tanai, Kenji; Kikuchi, Hirohito*
no journal, ,
no abstracts in English
Someya, Mayuko*; Wakita, Shingo*; Toida, Masaru*; Fujita, Tomoo
no journal, ,
no abstracts in English
Asai, Hideaki; Kuji, Masayoshi*; Matsui, Hiroya
no journal, ,
Two deep shafts(the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory(MIU) is currently being constructed by Japan Atomic Energy Agency(JAEA). To estimate the rock mass quality and UCS on shaft wall, existent rock mass classification methods (CRIEPI, RMR and New-JH) and in-situ needle sounding tests were applied in rock. A new quantitative rock mass classification method based on JGS standard was developed. This method showed good suitability to sedimentary rock in the Ventilation Shaft. Afterward, the new method was applied to crystalline rock in the Main Shaft and the Ventilation Shaft.
Sawada, Atsushi; Tetsu, Keiichi*; Sakamoto, Kazuhiko*
no journal, ,
no abstracts in English
Fujita, Tomoo; Naito, Morimasa; Yui, Mikazu
no journal, ,
no abstracts in English
Sakai, Kazuo*; Koike, Masashi*; Aoki, Tomoyuki*; Yamamoto, Takuya*; Hatsuyama, Yoshihiro*; Yamazaki, Masanao
no journal, ,
In a construction project of the Horonobe URL, vertical shafts are excavated now by the Short Step method. This paper examines the behavior of concrete lining and rock mass around the shaft. To reflect the excavation sequence, a 3-D analysis is performed, modeling rock mass and support members around an advancing face. The analysis shows well specific phenomena of the Short Step method, as in the rock mass displacement and lining stress. It also reveals lining stress distribution are complex. In future, it is important to investigate lining stress through detailed measurements.
Kumamoto, So*; Shimo, Michito*; Yamamoto, Hajime*; Sawada, Atsushi
no journal, ,
no abstracts in English
Shinkai, Fumiaki; Sugiyama, Hirokazu*; Nobuto, Jun*
no journal, ,
no abstracts in English
Nobuto, Jun*; Okihara, Mitsunobu*; Kobayashi, Shinji*; Shinkai, Fumiaki
no journal, ,
no abstracts in English
Sasamoto, Hiroshi; Yui, Mikazu; Naito, Morimasa; Walker, C.; Fujisaki, Kiyoshi*; Takase, Hiroyasu*
no journal, ,
Development of a method to evaluate applicability of cementitious materials based on the implications for long-term safety has been performed considering the use of cementitious grout materials for reduction of water leakage during the stages of drilling of drift and implementation. In this study, an approach to evaluate the effects on alteration behavior of rock, the status of development of necessary model and database and a test case for evaluation are presented.
Ichimura, Takahito; Kitami, Takayuki; Horiguchi, Takashi; Kawama, Itsuo*
no journal, ,
no abstracts in English
Kobayashi, Yasushi; Sugita, Yutaka; Izumi, Atsushi; Toida, Masaru*; Sasakura, Takeshi*
no journal, ,
no abstracts in English