Results of single borehole hydraulic testing in Mizunami Underground Research Laboratory Project (Phase 2)

Daimaru, Shuji; Takeuchi, Ryuji; Onoe, Hironori; Saegusa, Hiromitsu

JAEA-Data/Code 2012-020, 44 Pages, 2012/09

JAEA-Data-Code-2012-020.pdf:6.96MB

This report summarize the results of the single borehole hydraulic tests of 79 sections conducted as part of the Construction phase (Phase 2) in the Mizunami Underground Research Laboratory (MIU) Project. The details of each test (test interval depth, geology, etc.) as well as the interpreted hydraulic parameters and analytical method used are presented in this report.

Study on hydrogeology in the Mizunami Underground Research Laboratory Project; Hydrogeological investigation to evaluate hydraulic characteristic of main-shaft fault

Daimaru, Shuji; Onoe, Hironori; Takeuchi, Ryuji

JAEA-Research 2012-008, 70 Pages, 2012/06

JAEA-Research-2012-008.pdf:21.39MB
JAEA-Research-2012-008(errata).pdf:0.54MB

JAEA is performing the Mizunami Underground Research Laboratory (MIU) project. Currently, the project is under Phase II and Phase III. As part of Phase II, the borehole investigation (10MI22, 10MI23) was conducted at 100m Measurement Niche in -300m Access/Research Gallery in 2010. As a result of long-term pumping test, completely different pressures due to the pumping test were observed in monitoring boreholes on opposite sides of the Main-shaft fault. This observation indicates that the normal direction of the Main-shaft fault is low permeable. And, the Main-shaft fault acts as a flow barrier normal to the fault plane. As a result of hydraulic test, permeability of fracture zone with accompanying host rock zone was from 9.4E-7m/s to 3.8E-11m/s. And, this zone was classified as two sections, permeability of the section is same as the upper highly fractured domain (UHFD :1.0E-7m/s) and the section of its permeability is 4 order lower than UHFD.

Study on connectivity of water-conducting features in a fractured rock based on the fluid logging and hydraulic packer testing

Takeuchi, Shinji; Takeuchi, Ryuji; Toya, Naruhisa*; Daimaru, Shuji

Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 8 Pages, 2011/12

Development of the multi-level displacement sensor using Fiber Bragg Gratings (FBG)

Sanada, Hiroyuki; Sugita, Yutaka; Daimaru, Shuji; Matsui, Hiroya; Kashiwai, Yoshio*

Journal of MMIJ, 126(10,11), p.569 - 576, 2010/10

When the structures such as rock slopes, underground caverns for the geological disposal of high level radioactive waste and underground power plants are constructed, the potential for displacement and damage in the surrounding rock mass is increased due to stress concentration and creep phenomenon. Therefore, the long-term monitoring of rock stability for construction of rock cavern and slopes is important to maintain stability of rock structures. Recently, development of sensors that use optical fiber have expanded mainly in the field of civil engineering and, in rock and soil mechanics, since several parameters such as temperature, strain, pressure, pH etc. can be obtained by using backscattered light in optical fibers. Additionally, some important advantages using optical fiber are its high resistance to the electric insulation failure, long-term endurance and ability to transmit data over long distances. This paper describes development of a multiple-type displacement sensor using FBG, which has potential for the long-term durability and high accuracy. Laboratory tests were carried out to investigate the relational expression computed from the relationship of the variation in the Bragg wavelength, temperature and displacement. Accuracy of the prototype developed in this research is better than 0.5% or 1/100 mm. The in situ tests involving long-term monitoring using boreholes were conducted to confirm the workability and applicability of the prototype. From the results of the in situ tests, workability is equivalent to the extensometers usually used for long-term monitoring, and the displacement computed from the variation of Bragg wavelength is almost equal to the artificially induced deformation.

Study on hydrogeology on the Mizunami Underground Research Laboratory Project annual report for fiscal year 2008

Takeuchi, Ryuji; Saegusa, Hiromitsu; Oyama, Takuya; Keya, Hiromichi; Sato, Atsuya; Kosaka, Hiroshi; Takeda, Masaki; Daimaru, Shuji; Takeuchi, Shinji

JAEA-Research 2010-018, 133 Pages, 2010/08

JAEA-Research-2010-018.pdf:28.5MB

The Mizunami Underground Laboratory Project is a comprehensive research project investigating the deep underground environment within crystalline rock. The project goals of the project from surface-based investigation phase (Phase I) through to operation phase (Phase III) are: to establish techniques for investigation, analysis and assessment of the deep geological environment, and to develop a range of engineering for deep underground application. Currently, the project is under the construction phase (Phase II). One of the Phase II goals, which is for the project goal, was set to develop and revise models of the geological environment using the investigation results obtained during excavation, and determine and assess changes in the geological environment in response to excavation. This document presents the overview of results of the research and development on "hydrogeology" performed in fiscal year 2008, with regard to the Phase II goal.

The application test of underground water pressure measurement system by using optical fiber

Hirata, Yoichi*; Daimaru, Shuji*

JNC TJ7410 2005-008, 28 Pages, 2004/03

JNC-TJ7410-2005-008.PDF:0.91MB

We examined this hydraulic pressure gauge under the conditions that was not proved yet, and improved the measurement house and the method to get data.

Horonobe Underground Research Laboratory Project, Development of techniques for investigating the geoligical environment; Development of extensometer used FBG sensor

Sanada, Hiroyuki; Sugita, Yutaka; Daimaru, Shuji; Matsui, Hiroya; Kashiwai, Yoshio*

no journal, , 

no abstracts in English

Applicability of normalized pressure derivative plot for single hole hydraulic test in fracture rock

Toya, Naruhisa*; Takeuchi, Ryuji; Takeuchi, Shinji; Daimaru, Shuji; Nakano, Katsushi*; Kikuyama, Seiji*

no journal, , 

no abstracts in English

Mizunami Underground Research Laboratory Project; Results of the borehole investigations to assess the geological environment in and around the Main-shaft fault

Takeuchi, Ryuji; Takeda, Masaki; Ueno, Takashi; Daimaru, Shuji; Tokuyasu, Shingo; Onoe, Hironori; Shingu, Shinya; Ishibashi, Masayuki; Matsuoka, Toshiyuki; Mizuno, Takashi; et al.

no journal, , 

no abstracts in English

Phase II investigation in the MIU project, 2; Confirmation of adequacy of groundwater flow conceptual model using groundwater flow simulation

Onoe, Hironori; Daimaru, Shuji*; Onuki, Kenji; Karino, Tomoyuki; Takeuchi, Ryuji

no journal, , 

The Mizunami Underground Research Laboratory (MIU) is now under construction by the Japan Atomic Energy Agency, in the Cretaceous Toki granite in the Tono area, Central Japan. In Phase II of the MIU Project, hydrogeological investigations and long-term groundwater pressure monitoring are to be carried out in order to confirm adequacy of the groundwater flow conceptual model constructed in Phase I. In this paper, adequacy of the groundwater flow conceptual model is confirmed using groundwater flow simulation based on data from pumping test was carried out from the -300 m Access/Research Gallery.