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Hirano, Toru; Seno, Yasuhiro; Nakama, Shigeo; Okubo, Seisuke*
Dai-37-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.397 - 402, 2008/01
Toki granite was tested to obtain parameters for the constitutive equation and numerical simulations were carried out. The testing method was uniaxial compressive loading at the moderate a constant strain rate that is decreased after yielding to obtain the complete stress-strain curve. In addition, two kinds of the strain rate were alternately switched to obtain the parameter 
from one specimen. The represents the strength time-dependence in the constitutive equation. Based on and the complete stress-strain curve, second parameter 
can be calculated by numerical simulations. The accounts for the behavior after yielding. According to the results, Toki granite has =52 and =60. Thus shows relatively low time-dependence.
Sato, Hisashi; Sawada, Atsushi
Dai-37-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.263 - 268, 2008/01
The fracture aperture and tracer concentration within a single fracture was measured quantitatively, by using optical method with the transparent replica of a single fracture, to study how flow and transport is affected by the aperture spatial pattern. Two dimensional groundwater flow analysis was applied with the transmissivity estimated from measured aperture data, according to the assumption that cubic law could be applicable locally. The evaluated flow rate through the fracture was 1.6 times larger than the hydraulic test result. The mass balance aperture calculated from the mean travel time of tracer migration with groundwater flow rate was equivalent to the arithmetic mean value of the aperture data.
Kinomura, Koji*; Ogawa, Toyokazu*; Aoki, Tomoyuki*; Yamamoto, Takuya*; Matsui, Hiroya; Sanada, Hiroyuki
Dai-37-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.307 - 312, 2008/01
no abstracts in English
Ogawa, Toyokazu*; Kinomura, Koji*; Aoki, Tomoyuki*; Yamamoto, Takuya*; Matsui, Hiroya; Sanada, Hiroyuki
Dai-37-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.301 - 306, 2008/01
no abstracts in English
Tsusaka, Kimikazu; Tanimoto, Chikaosa*; Nakane, Tatsuto*; Ueno, Takaaki*; Koizumi, Yu*
Dai-37-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.31 - 36, 2008/01
In the construction of geological repository of high-level radioactive waste, TBM excavation could be one of the most usable tunneling methods to minimize the loosening of rock. The secondary fragmentation has been recognized to have unfavorable influence on the driving, which is defined as a phenomenon that rock pieces between a cutter head and face are fragmented. The chips in the tunneling are well-known for one of useful indices to reflect the geological conditions. The flat and elongated chips indicate the cutting face with less joints and good practice with less secondary fragmentation rate. Through a case history in granitic rock, the authors proposed the new index to estimate the shape of chips and studied the relationship between the index and the excavation efficiencies. In conclusion, it was clarified that chips with the new index over 3.5 were generally observed when a TBM drove with less than 30% the secondary fragmentation rate.