Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Shibuya, Hitoshi*; Suzuki, Takashi*; Kuroda, Hidetaka
JAEA-Research 2008-052, 138 Pages, 2008/07
JAEA-Research-2008-052.pdf:43.42MB
The soundness of the design of the support system for shafts and galleries and the effects of pre- and post-excavation grouting have been assessed to confirm the proposed technical solutions at the Mizunami Underground Research Laboratory. For this purpose, design of the shafts above 1,000 m depth and the galleries above 500 m depth has been improved and grouting effects around the shafts has been calculated by means of seepage flow analysis. Additionally, analytical investigations on the concrete lining with respect to the influence of water pressure have been performed.
Shibuya, Hitoshi*; Suzuki, Takashi*; Kuroda, Hidetaka
JAEA-Research 2008-027, 274 Pages, 2008/03
JAEA-Research-2008-027-01.pdf:17.64MBJAEA-Research-2008-027-02.pdf:41.84MB
Initial design of shafts and tunnels of the Mizunami Underground Research Laboratory was done in FY2002, and preliminary analysis of those of 0 to 300 m depth was done in FY2003 on the basis of geological survey results obtained then. We have recently completed boring of MIZ-1 borehole and obtained geological data to the depth of 1,000 m. In order to confirm validity of the design, we have reviewed geological model, rock property, initial stress and other characteristics and conducted corrective analysis (two-dimensional) on the basis of the new data. In junction of shaft and sub-stage (horizontal tunnel) (100 m and 300 m depth) where stress might be concentrated, three-dimensional analysis was done.
Shibuya, Hitoshi*; Suzuki, Takashi*; Yokoi, Mikihito*
JNC TJ7410 2005-005, 253 Pages, 2004/02
JNC-TJ7410-2005-005.pdf:54.21MB
None
Taki, Mitsuhiro*; Asai, Shiro*
JNC TJ7440 2003-005, 127 Pages, 2003/03
JNC-TJ7440-2003-005.pdf:9.11MB
Tono Geoscience Center (TGC) of the Japan Nuclear Cycle Development Institute (JNC) has established several observation catchment areas (0.01 to 0.535 square kilometer) for observation surface hydrogical parameters by installation monitoring system, as part of its Regional Hidrogeological Study (RHS). The groundwater recharge into the basement rock obtained through the water balance observation in these catchments is a significant subject to be assinged the upper boundary condition for groundwater flow analysis. The long-term observation in the Shoba River catchment indicates the following results: (1) The groundwater recharge into the basement rock differs greatly between the upper and lower catchment. (2) The characteristics of changes in the groundwater recharge into the basement rock differ depending on the water balance observation scale.At present, no catchments larger than the established ones are set for the RHS, and thus the characteristics of the groundwater recharge on a larger catchment have not been identified. To characterise of the groundwater recharge into the basement rock in the entire Hiyoshi River catchment including the local scale areas where groundwater flow has been analyzed (few score square kilometer), this task is aimed at establishing a runoff observation method for the purpose of long-term runoff observation in the Hiyoshi River catchment. Principal procedures and results of the study are described as below: (1) For the field survey to install a runoff gauging station in the lower Hiyoshi River, Koyake Bridge was selected as the location among four candidates. (2) Continuous observation of water level was chosen for the runoff observation method, with the combined use of the current-meter method for the time of low water level and the float method for the time of flooting. (3) The actual runoff was measured for 16 days and the rating curve was established. (4) It was designed to organize a water level gauging station at Koyake Bridge.