Backfilling test in drilling pits as part of Groundwater REcovery Experiment in Tunnel (GREET) Project

Takayasu, Kentaro; Onuki, Kenji*; Kawamoto, Koji*; Takayama, Yusuke; Mikake, Shinichiro; Sato, Toshinori; Onoe, Hironori; Takeuchi, Ryuji

JAEA-Technology 2017-011, 61 Pages, 2017/06

JAEA-Technology-2017-011.pdf:9.15MB

The Groundwater REcovery Experiment in Tunnel (GREET) was put into effect as development of drift backfilling technologies. This test was conducted by making the Closure Test Drift (CTD) recovered with water after carrying out a plug around 40m distance from northern edge face of horizontal tunnel of depth 500m, for the purpose of investigation of recovering process of rock mass and groundwater under the influence of excavation of tunnel. This report presents the efforts of backfilling investigation using bentonite composite soil and execution of backfilling into borehole pits excavated in the CTD which were carried out in fiscal 2014 as a part of GREET, and succeeding observation results inside pits from September 2014 to March 2016.

Mizunami Underground Research Laboratory Project; Data compilation of boreholes in shafts and research galleries (12MI2714MI51 Boreholes)

Kuroiwa, Hiroshi*; Kawamoto, Koji; Yamada, Nobuto; Sasao, Eiji

JAEA-Data/Code 2015-003, 108 Pages, 2015/06

JAEA-Data-Code-2015-003.pdf:10.4MB
JAEA-Data-Code-2015-003(errata).pdf:1.51MB
JAEA-Data-Code-2015-003-appendix(CD-ROM).zip:1150.87MB

Japan Atomic Energy Agency (JAEA) is performing the Mizunami Underground Research Laboratory (MIU) Project, which is a scientific study of the deep geological environment as a basis of research and development for geological disposal of high level radioactive wastes (HLW), in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in the crystalline rock. The MIU Project has three overlapping phases, Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). This report compiles the data of results from borehole investigations which has been carried out in the research gallery in the fiscal year from 2012 to 2014. These data include results of core observation, geophysical logging, and so on.

Study on geology on the Mizunami Underground Research Laboratory Project; Geology and geological structure at the -500m stage

Kawamoto, Koji; Kuboshima, Koji*; Murakami, Hiroaki; Ishibashi, Masayuki; Sasao, Eiji

JAEA-Research 2014-021, 30 Pages, 2014/11

JAEA-Research-2014-021.pdf:6.79MB

The MIU (Mizunami Underground Research Laboratory) Project has three overlapping phases, Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). Currently, the project is under Phase II and Phase III. One of Phase II goals is set up to develop and revise models of the geological environment using the investigation results obtained during excavation, and to determine and assess changes in the geological environment in response to excavation. This report aims at compiling results of study on geology and geological structure at the -500m Stage in the MIU construction site, investigated in the Phase II and provides the fundamental information on the geology and geological structure for future study and modeling of geological environment.

Results of pilot borehole investigation in -500m access/research gallery-south (12MI32 borehole)

Kawamoto, Koji; Kuroiwa, Hiroshi; Yamada, Nobuto; Onuki, Kenji; Omori, Kazuaki; Takeuchi, Ryuji; Ogata, Nobuhisa; Omori, Masaki; Watanabe, Kazuhiko

JAEA-Technology 2014-011, 92 Pages, 2014/07

JAEA-Technology-2014-011.pdf:24.65MB
JAEA-Technology-2014-011-appendix(DVD).zip:331.54MB

This document summarizes the data of pilot boreholes (12MI32) in the -500m Access/Research Gallery-South. The geological, hydraulic and geochemical data were obtained. In addition, groundwater monitoring system was installed to observe the groundwater pressure in initial condition and change during the excavation of gallery. The results of investigation, biotite granite with medium to coarse-grained equigranular texture are characterized. Rock mass classification is B from CM class. Minor fault with fault breccia are observed around 48.90mabh. However, S200_13 fault and IF_SB3_13_3 fault (that were presumed by an original model) were not observed. Density of fracture is large in the section of 40.00 to 80.00mabh. Water inflow was a maximum of 600 L/min in 78.83mabh. Permeability ranges from 2.0E-9 to 1.5E-08m/sec at the zone with low inflow, from 1.1E-05 to 1.6E-05m/sec at the zone with high inflow, respectively. Groundwater chemistry is rich in Na and Cl ion.

Study on geology on the Mizunami Underground Research Laboratory Project; Geology and geological structure from G.L. -300m to G.L. -500m

Tsuruta, Tadahiko; Sasao, Eiji; Kawamoto, Koji; Kuboshima, Koji; Ishibashi, Masayuki

JAEA-Research 2013-014, 35 Pages, 2013/11

JAEA-Research-2013-014.pdf:12.15MB

JAEA is performing the Mizunami Underground Research Laboratory (MIU) Project in order to establish comprehensive techniques for the investigation, analysis and assessment of the deep geological environment in the fractured crystalline rock. The Project has three overlapping phases with a total duration of about 20 years, and is under the Phase II (Construction phase) and the Phase III (Operation phase). One of the Phase II goals is set up to develop and revise models of the geological environment using the investigation results, and to determine and assess changes in the geological environment in response to excavation. This report aims compiling the study on geology and geological structure from G.L. -300m to G.L. -500m, excavated in the fiscal years from FY2008 to FY2012, and provides the fundamental information on the geology and geological structure for future study and modelling of geological environment. The compiling data are utilized in the updating of the geological models.

Mizunami Underground Research Laboratory Project, Compilation of results of geological investigation at the shafts and research galleries

Kawamoto, Koji; Kuboshima, Koji; Ishibashi, Masayuki; Tsuruta, Tadahiko; Sasao, Eiji; Ikeda, Koki; Mikake, Shinichiro; Hara, Ikuo; Yamamoto, Masaru

JAEA-Data/Code 2012-009, 47 Pages, 2012/07

JAEA-Data-Code-2012-009.pdf:3.7MB
JAEA-Data-Code-2012-009-appendix(DVD-ROM)-1.zip:236.07MB
JAEA-Data-Code-2012-009-appendix(DVD-ROM)-2.zip:615.87MB
JAEA-Data-Code-2012-009-appendix(DVD-ROM)-3.zip:45.88MB
JAEA-Data-Code-2012-009-appendix(DVD-ROM)-4.zip:115.54MB
JAEA-Data-Code-2012-009-appendix(DVD-ROM)-5.zip:230.55MB

This document presents the data of geological investigations in the shafts and research galleries to the depth of 300 m of the MIU from the 2004 fiscal year to the 2008 fiscal year. In the shafts and research galleries of the MIU, the Cretaceous Toki granite is unconformably overlain by the generally flat lying Miocene Mizunami Group (younging upwards from the Toki Lignite-bearing Formation to the Hongo and Akeyo Formations) with a depth of about 166 m to 168 m.

Mizunami Underground Research Laboratory Project; Geological investigations

Ishibashi, Masayuki; Kawamoto, Koji; Kuboshima, Koji; Kuroiwa, Hiroshi; Sasao, Eiji; Tsuruta, Tadahiko; Matsuoka, Toshiyuki

no journal, , 

no abstracts in English

Mode of occurrences of flow-path fractures in deep crystalline rock; A Case in the Mizunami Underground Research Laboratory

Kawamoto, Koji; Ishibashi, Masayuki; Sasao, Eiji

no journal, , 

no abstracts in English

Mode of occurrences of flow-path fractures in the Mizunami Underground Research Laboratory, 2; Water inflow point in borehole

Kawamoto, Koji; Sasao, Eiji

no journal, , 

no abstracts in English