Doughty, C.*; Tsang, C.-F.*; Yabuuchi, Satoshi; Kunimaru, Takanori
Journal of Hydrology, 482, p.1 - 13, 2013/03
To improve the field method to provide heterogenety data for modeling of solute transport in complex fractured rock, the analysis of the flowing fluid electric conductivity(FFEC) logging was examined. FFEC logging was conducted in the pilot borehole in fractured sedimentary rock in Japan as part of the Horonobe Underground Research Laboratory Project. FFEC logs were collected under unpumped conditions and at two different pumping rates, nominally 8L/min and 16L/min. Though the data have a number of complications, the analysis was successful to identify 17 hydraulically conducting fractures, and to estimate their hydraulic transimissivities, inherent pressure heads and salinities (in terms of fluid electric conductivities). The results are confirmed in comparison with hydraulic packer tests and hydrochemical data.
Amano, Yuki; Nanjo, Isao; Murakami, Hiroaki; Yabuuchi, Satoshi; Yokota, Hideharu; Sasaki, Yoshito; Iwatsuki, Teruki
Chikasui Gakkai-Shi, 54(4), p.207 - 228, 2012/11
We verified the surface-based hydrochemical investigation for deep underground at Horonobe Underground Research Laboratory (URL) at Horonobe, Hokkaido, Japan, and identified the hydrochemical changes during the URL construction. The evaluation of the relationship between the number of borehole and understanding of water chemistry suggests that three basic borehole investigations and additional borehole for high permeable geological structure (fault and fractured zone) are required to illustrate cross-sectional hydrochemical distribution including the uncertainty in kilometers scale survey line. The observation and numerical analysis of hydrochemical variation (salinity, pH, ORP) around URL indicate that the groundwater pressure and the salinity in the vicinity of high permeable geological zone are varying due to groundwater inflow into the drift. The variation was consistent with the prediction reported previously. These results are considered to be referred to the management during surface-based investigation and construction of underground facility at the other sedimentary rock area.
Yabuuchi, Satoshi; Kunimaru, Takanori; Kishi, Atsuyasu*; Komatsu, Mitsuru*
Doboku Gakkai Rombunshu, C (Chiken Kogaku) (Internet), 67(4), p.464 - 473, 2011/11
Japan Atomic Energy Agency has been conducting the Horonobe Underground Research Laboratory (URL) project in Horonobe, Hokkaido, as a part of the research and development program on geological disposal of high-level radioactive waste. Pore water pressure and water content around a horizontal drift in the URL have been monitored for over 18 months since before the drift excavation was started. During the drift excavation, both pore water pressure and water content were decreasing. Pore water pressure has been still positive though it continued to decrease with its gradient gradually smaller after excavation, while water content turned to increase about 6 months after the completion of the excavation. It turned to fall again about 5 months later. An unsaturated zone may have been in homogeneously formed around the horizontal drift considering a degassing.
Iwatsuki, Teruki; Sato, Haruo; Nohara, Tsuyoshi; Tanai, Kenji; Sugita, Yutaka; Amano, Kenji; Yabuuchi, Satoshi; Oyama, Takuya; Amano, Yuki; Yokota, Hideharu; et al.
JAEA-Research 2011-009, 73 Pages, 2011/06
The research and development plan in Horonobe Underground Research Laboratory are summarized according to the 2nd Midterm Plan till 2014 fiscal year of JAEA. In this midterm, galleries and the infrastructures for the research and development up to the depth of 350 m are constructed by Private Financial Initiative (PFI). Additionally Phase 3: Operation phase at the galleries begins in parallel to Phase 2: Construction phase. In these phases various research and development including collaboration with other institutes are conducted at the galleries. Generallic applicable techniques on the subject of the investigation of geological environment, facility construction in deep underground and the reliability of geological deposal are developed during the phase. The feasibility and reliance of various technologies concerning geological disposal is demonstrated by widely opening the outcome to the public in the society.
Yamamoto, Yoichi; Maekawa, Keisuke; Yabuuchi, Satoshi; Yokota, Hideharu
Nihon Chikasui Gakkai 2010-Nen Shuki Koenkai Koen Yoshi, p.166 - 171, 2010/11
no abstracts in English
Yabuuchi, Satoshi; Kunimaru, Takanori; Ishii, Eiichi; Hatsuyama, Yoshihiro*; Ijiri, Yuji*; Matsuoka, Kiyoyuki*; Ibara, Tetsuo*; Matsunami, Shinjiro*; Makino, Akiya*
JAEA-Data/Code 2008-026, 62 Pages, 2009/02
The Pilot Borehole Investigation of the Ventilation Shaft was conducted in Horonobe, Hokkaido, Japan from October 2007 to March 2008. Main purpose of the investigation is to understand geological, hydrogeological and hydrochemical properties of the formation where the Ventilation Shaft has been excavated. Hydraulic packer tests show that hydraulic conductivity lies in the range from 1.1E-11 to 1.4E-7 m/sec down to 500 m in depth. This heterogeneity mainly depends on the distribution and permeability of groundwater inflow points, which were detected by Fluid Electric Conductivity logging. High conductive zones were found between 263 m and 290 m, 355 m and 370 m of the depth in the pilot borehole. An effective method for reducing groundwater inflow should be considered for the deeper Ventilation Shaft excavation.
Kurikami, Hiroshi; Takeuchi, Ryuji; Yabuuchi, Satoshi; Seno, Shoji*; Tomura, Goji; Shibano, Kazunori; Hara, Minoru; Kunimaru, Takanori
Doboku Gakkai Rombunshu, C, 64(3), p.680 - 695, 2008/09
Japan Atomic Energy Agency has been conducting the Horonobe Underground Research Laboratory (URL) project in Horonobe, Hokkaido, as a part of the research and development program on geological disposal of high-level radioactive waste. This paper shows the results of hydrogeological investigations in the surface-based investigation phase of the project. Hydrological and meteorological investigations show that the infiltration rates of the drainage basins varies and that the infiltration rate depends on the flora and the topography. The hydraulic tests using the deep boreholes reveals that hydraulic conductivity of the scale of a few decameters to a hundred meter varies widely and decreases with depth in the same formation, while the laboratory hydraulic tests suggest that hydraulic conductivity of the intact rock is influenced by the stress history. The hydraulic tests and the long-term monitorings of hydraulic pressure clarify relatively high pressure in the deep underground. Furthermore, groundwater flow analysis shows that the groundwater in and around the URL area flows regionally from the east to the west and depends locally on the geography and geology.
Doughty, C.*; Tsang, C.-F.*; Hatanaka, Koichiro; Yabuuchi, Satoshi; Kurikami, Hiroshi
Water Resources Research, 44(8), p.W08403_1 - W08403_11, 2008/08
The flowing fluid electric conductivity (FFEC) logging method is an efficient way to provide information on the depths, salinities, and inflow strengths of individual conductive features intercepted by a borehole, without the use of specialized probes. The present paper presents the application of the method to two zones within a 1000-m borehole in sedimentary rock, which produced, for each zone, three sets of logs at different pumping rates, each set measured over a period of about one day.
Seno, Shoji; Kurikami, Hiroshi; Yabuuchi, Satoshi; Hara, Minoru
JAEA-Research 2006-079, 22 Pages, 2007/03
Horonobe Underground Research Laboratory of Japan Atomic Energy Agency has been investigating surface hydrogeological features in and around the Horonobe Underground Research Laboratory (URL) area as a part of Horonobe URL project. The objective of measurement of groundwater tables in shallow boreholes is to understand the distribution of the groundwater table and its seasonal fluctuation that will be boundary conditions of a groundwater flow analysis. This report shows the results of the measurement since December 2003 to October 2005 every few month and discussion on the surface hydrogeological features. The results are as follows: (1) The real watershed between the Shimizu river basin and the Penke-ebekorobetsu river basin exists a little to the south of the geographical watershed among the monitoring line. (2) Snow fall/melting is the largest impact on the annual fluctuation of the groundwater table, while influence of precipitation is temporal. (3) The amplitude of the fluctuation of groundwater table depends on the location. (4) Peak level of groundwater table after precipitation is gentler than that of the river water table and appears two or three days later.
Yabuuchi, Satoshi; Kurikami, Hiroshi; Seno, Shoji*; Hara, Minoru; Kunimaru, Takanori; Takeuchi, Ryuji
JAEA-Research 2006-056, 32 Pages, 2006/09
Long-term groundwater pressure monitoring has been performed in HDB-1,2,3,6,7 and HDB-8 boreholes in the Horonobe Underground Research Laboratory Project. Groundwater pressure in many levels in the boreholes shows an almost steady state at present, however it is still recovering since the beginning of the observation in some levels. Relatively high groundwater pressure is observed in HDB-2 borehole, about 7km away from the URL area. According to the groundwater pressure monitoring in deep boreholes so far, it is inferred that hydraulic head becomes higher with the increase of the depth and hydraulic head in the east is higher than in the west around the URL area. Through the groundwater monitoring, performance of the long-term groundwater monitoring systems could be examined and some problems of the parts could also be found.
Kurikami, Hiroshi; Kunimaru, Takanori; Yabuuchi, Satoshi; Seno, Shoji; Shimo, Michito*; Kumamoto, So*
Proceedings of 2nd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2006), p.584 - 589, 2006/05
no abstracts in English
Ikeda, Koki; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Mie, Hideki; Yabuuchi, Satoshi
JNC TN7430 2005-002, 65 Pages, 2005/02
The Regional HydrogeologicaI Study (RHS) Project, which commenced in 1992, has been performed in the 10km-square area. It was intended for the development of an understanding of the geological environment at the regional and local area. The DH-15 borehole was drilled to develop the techniques of evaluations for the fracture zones whose presence have been observed by previous surveys around the MIU Construction Site. This advance report summarized to familiar the results of borehole investigations to person interested and to evaluate preliminary issues. Interpretations and conclusions described in this report will be revised depending on the progress of analytical works.
Ikeda, Koki; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Mie, Hideki; Yabuuchi, Satoshi
JNC TN7430 2005-001, 46 Pages, 2005/02
The RegionaI Hydrogeological Study (RHS) Project, which commenced in 1992, has been performed in the 10km-square area. It was intended for the development of an understanding of the geological environment at the regional and local scale. The DH-14 borehole was drilled to develop the techniques of evaluations for the large-scale lineaments whose presence have been observed in the northeast region of Regional Hydrogeological Study project. This advance report summarized to familiar the results of borehole investigations to person interested and to evaluate preliminary issues. Interpretations and conclusions described in this report will be revised depending on the progress of analytical works.
Nakama, Shigeo; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; Iwatsuki, Teruki; Sato, Toshinori; Ikeda, Koki; Yabuuchi, Satoshi; Koide, Kaoru
JNC TN7400 2005-002, 90 Pages, 2004/12
Hanamuro, Takahiro; Saito, Hiroshi; Asamori, Koichi; Iyatomi, Yosuke; Tsuruta, Tadahiko; Yabuuchi, Satoshi; Mizuno, Takashi; Sato, Toshinori; Nakatsuka, Noboru; Shigeta, Naotaka; et al.
JNC TN7400 2004-010, 173 Pages, 2004/12
Japan Nuclear Cycle Development Institute. (JNC) is developing two underground research laboratory projects; the Mizunami Underground Research Laboratory(MIU) Project for crystalline rock,.at Tono Geoscience Center (TGC) and the Horonobe Underground Research Laboratory ・Project for・ sedimentary rock at the Horonobe Underground Research Center. Both projects are intended for research and development of geological disposal technology for high-level radioactive wastes. At this time, these two underground research laboratory projects are advancing to the Construction Phase (Phase II) from the Surface-based Investigation Phase (Phase I). Therefore it was considered appropriate for JNC to hold an international conference to introduce the two underground research laboratory projects and R&D results from Phase I, to have presentations on overseas URLs, to exchange opinions by researchers in each field of research and to reflect the conference outcome in a future R&D plan. The Conference was held in two parts. Part 1, the "International Conference on Geoscientific Study in Mizunami '04 (ICGM '04)" featured the MIU Project and the Regional Hydrogeological Study Project performed by TGC. It was held in Mizunami City at the Sogo Bunka Center from October 21st to 22nd. In Part 2, the "International Workshop on Horonobe Underground Research Laboratory Project", featured the Horonobe Underground Research Laboratory Project performed by the Horonobe Underground Research Center. It was held at Horonobe Town Hall from, October 25th to 26th 2004. This Technical Report documents the ICGM'04 program, abstracts of presentations and slides and transcription of "Panel Discussions II and "Summary of the Conference"
Amano, Kenji; Iwatsuki, Teruki; Ota, Kunio; Osawa, Hideaki; Takeuchi, Shinji; Yabuuchi, Satoshi
JNC TN7400 2004-002, 39 Pages, 2004/07
During fiscal year 2003, as the research for regional scale, groundwater simulation using realistic geological model was carried out, and the domain setting method of modeling in regional scale was shown and the domain of local scale in the RHS project area was determined. Lineament analysis, borehole investigations (DH-14, DH-15 and 03RT-03) were carried out in the local scale domain. Long-term groundwater monitoring using the existing boreholes was continued. Improvement of the instruments of hydraulic test and groundwater sampling was also continued.
Ota, Kunio; Takeuchi, Shinji; Koki, Ikeda; Kenji, Amano; Matsuoka, Toshiyuki; Yabuuchi, Satoshi; Iwatsuki, Teruki
JNC TN7400 2004-001, 69 Pages, 2004/05
The MIZ-1 borehole investigation programme was launced in December 2002, as a step of the surface-based investigations at the MIU Site. In MIZ-1 Phase I/II (from March to May 2003), the borehole was drilled down to 123m in the uppermost part of the basement granite and geological, geophysical, hydrogeological and hydrochemical investigations were performed. Quality-controlled data on geology, hydrogeology and hydrochemistry of the sedimentary overburden and the basement granite were acquired, therby advancing the understanding of the shallow geological environment at the MIU Site. In addition, from technical and QC viewpoints, a range of successes and set-backs was produced and lessons and feedback from the achievements were obtained.
Sasao, Eiji; Nakama, Shigeo; Yabuuchi, Satoshi
JNC TN7400 2004-003, 22 Pages, 2004/04
The current geoscientific studies in the Tono Mine have been carried out since 1998. A variety of results were obtained in the 2003 financial year in three different tasks involved in the studies. This report presents the summary of the study in the FY 2003.
Ota, Kunio; Amano, Kenji; Kumazaki, Naoki; Matsuoka, Toshiyuki; Takeuchi, Shinji; Masumoto, Kazuhiko; Yabuuchi, Satoshi
JNC TN7410 2003-006, 0 Pages, 2003/07
The current geoscientific research of the Mizunami Underground Research Laboratory (MIU) Project have been carried out since the 1996 fiscal year at the Shobasama site in Akeyo-cho, Mizunami City, Gifu Prefecture. The main goals of the MIU Project are to establish appropriate methodologies for reliably investigating and assessing the deep subsurface, and to develop a range of engineering techniques for deep underground application in granite. The site for MIU construction was changed in January 2002, from the Shobasama site to city-owned land (MIU Construction Site) after lease contract with Mizunami city. The surface-based investigations at the MIU facility site have started since February 2002. In 2002 fiscal year, geophysical survey and shallow borehole investigations was conducted and deep borehole investigations have started for modeling and characterization of geological environment in the MIU Construction Site before sinking the shafts. Detail of study and survey during the construction phase of MIU project was planned based on the layout and plan of construction of the underground facilities for development of engineering technologies in a deep underground. In Shobasama site, VSP survey was carried out to improve the model of geological environment. Hydrogeological model was calibrated using the results of long-term pumping test and long-term subsurface and groundwater monitoring. Important factors for hydrogeological modeling were evaluated as the results of numerical analysis by multiple approaches of groundwater flow modeling. The preliminary analysis based on the rock mechanical model at the Shobasama site was performed to estimate the deformation caused by excavation of the underground facilities.
Semba, Tsuyoshi; Osawa, Hideaki; ; Yabuuchi, Satoshi; Takeuchi, Shinji; ; Matsuoka, Toshiyuki
JNC TN7410 2002-007, 51 Pages, 2002/10
Tono Geoscience Center, Japan Nuclear Cycle Development Institute has been conducting a wide range of geoscientific research in order to build a firm scientific and technological basis for the research and development of geological disposal. One of the major components of the ongoing geoscientific research programme is the Regional Hydrogeological Study (RHS) project in the Tono region, central Japan. The main goal of the RHS project is to develop and demonstrate surface-based investigation methodologies to characterize geological environments on a regional scale in Japan. The RHS project was initiated in 1992. To date, remote sensing, geological mapping, airborne and ground geophysical investigations, and measurements in eleven deep boreholes have been carried out in the study area (c. 100 km). Groundwater chemistry and hydraulic head monitoring is under way in these boreholes. Important results that have been obtained from these investigations include various information concerning the heterogeneity of lithological, hydrogeological and geochemical, and evolution of the groundwater geochemistry. During fiscal year 2001, hydraulic testing and groundwater sampling were conducted in borehole DH-13 which was drilled during fiscal year 2000. High density electrical resitivity measurements were conducted on a lineament. Groundwater monitoring was continued in the existing boreholes. As a part of evaluation of data uncertainties for modeling and simulation, study was started with the purpose of setting of modeling and simulation area around MIU constructionsite. Development of investigation instruments were also continued.