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Aoki, Kenji*; Mito, Yoshitada*; Kurokawa, Susumu*; Matsui, Hiroya; Niunoya, Sumio; Minami, Masayuki*
Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu, p.235 - 238, 2007/01
The monitoring of EDZ (Excavation Disturbed Zone) is one of the most important required technologies for the design of rock caverns such as the high-level radioactive waste repository. The authors developed the stress-based evaluation system of EDZ by AE monitoring and DEM (Distinct Element Method) simulation. In order to apply this system to the soft rock site, the authors try to grasp the relationship between AE parameters, stress change and rock failure by performing the high stiffness tri-axial compression tests including AE measurements on the soft rock samples, and its simulations by DEM using bonded particle model.
Sawada, Atsushi; Takeuchi, Shinji; Saegusa, Hiromitsu; Amano, Kenji
Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu, p.273 - 278, 2007/01
The groundwater flow velocity in void space of rock mass is one of the important parameters for evaluating mass transport in deep underground, especially on the safety assessment of high-level radioactive waste disposal. In general, the groundwater velocity in void space of rock mass is calculated by darcy velocity devided by the effective porosity. For estimating the effective porosity, the groundwater flowing void space should be evaluated. This paper describes configuration of the hydraulic effective porosity of fractured rock, and the study of estimating the hydraulic effective porosity by using borehole investigation data drilled from the surface.
Yasuhara, Hideaki*; Kurikami, Hiroshi; Kinoshita, Naoki*; Kishida, Kiyoshi*
Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu, p.283 - 286, 2007/01
no abstracts in English
Ogawa, Toyokazu*; Aoki, Tomoyuki*; Jo, Mayumi*; Matsui, Hiroya; Horii, Hideyuki*
Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu, p.39 - 44, 2007/01
In case rock exhibits time-dependent deformation, it is important to evaluate this effect on the tunnel stability, since the rock deforms elastically as well as inelatically even at the time of excavation. This paper introduces an engineering approach method to explain the effect of time-dependent deformation of rock at tunnel excavation stages on the stability. The mechanical parameters to describe a Burgers type rheological model are determined, based upon the drained triaxial creep test results performed on mudstone samples. With the parameters determined, plane-strain 2 dimensional numerical analyses are subsequently performed. In the analysis a couple of indices to describe the degree and timing of time-dependent deformation are introduced with reference to the instantaneous elastic deformation, and their effects on the amount of deformation and support pressure subsequent to the support erection are investigated.
Tanaka, Tatsuya*; Ando, Kenichi*; Hashimoto, Shuji*; Saegusa, Hiromitsu; Takeuchi, Shinji; Amano, Kenji
Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.267 - 272, 2007/01
no abstracts in English
Hashimoto, Shuji*; Tanaka, Tatsuya*; Ando, Kenichi*; Takeuchi, Shinji; Saegusa, Hiromitsu; Kim, H.*
Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.419 - 424, 2007/01
no abstracts in English
Kumamoto, So*; Shimo, Michito*; Saegusa, Hiromitsu; Onoe, Hironori
Dai-36-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.287 - 292, 2007/01
no abstracts in English
Yamamoto, Hajime*; Shimo, Michito*; Kunimaru, Takanori; Kurikami, Hiroshi
no journal, ,
In Neogene-Quaternary sedimentary basins, natural gases such as methane are often dissolved in groundwater significantly. In such cases, the excavation of deep underground yields the degassing of natural gases due to decline of groundwater pressure. In this paper, two-phase flow simulations of multi-component gases (methane, and carbon dioxide) and groundwater, incorporating the degassing, were performed for the shaft excavation in Horonobe underground research project. Prior to the simulations, unknown parameters of a relative permeability curve were tested using gas flow data during a borehole pumping test. The results drawn from the simulations are summarized as follows. (1) As depth increases, degassing and gas inflow occurs significantly. (2) Degassing increases the compressibility of pore fluids, resulting in slow changes in groundwater pressures around the shaft. (3) Although the occurrence of gas phase decreases water mobility, the influence of the dissolved gas on the groundwater inflow rate to the shaft was small.
Hashiba, Kimihiro; Matsui, Hiroya; Seno, Yasuhiro; Sato, Toshinori
no journal, ,
no abstracts in English
