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Journal Articles

Runoff analysis in Horonobe basin based on spatial estimation of hydrological quantities

Yamamoto, Yoichi; Maekawa, Keisuke; Yokota, Hideharu; Mukai, Kazuyuki*; Ishii, Keiji*

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.525 - 526, 2010/09

no abstracts in English

Journal Articles

Revaluation concerning application of a new quantitative rock mass classification for crystalline rock

Asai, Hideaki; Kuji, Masayoshi*; Matsui, Hiroya

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.137 - 138, 2010/09

Two deep shafts (the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency (JAEA). We proposed a new quantitative rock mass classification methods based on JGS standard besides existing rock mass classification methods (CRIEPI, RMR and New-JH). Afterward, the new classification method is applied to the drift, and it reports on the result of revaluing applicability concerning the new classification method.

Journal Articles

Applicability for the estimation of a rock strength by Schmidt hammer based on in-situ measurement

Kuji, Masayoshi*; Asai, Hideaki; Matsui, Hiroya

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.139 - 140, 2010/09

Two deep shafts (the Main Shaft and the Ventilation Shaft) at The Mizunami Underground Research Laboratory (MIU) is currently being constructed by Japan Atomic Energy Agency (JAEA). To estimate the rock mass quality and UCS on shaft wall, existent rock mass classification methods (CRIEPI, RMR and New-JH) and in-situ Schmidt hammer tests were applied in rock. In this report, applicability for the estimation of rock strength by Schmidt hammer is discussed based on in-situ measurement data.

Journal Articles

The Project for grouting development for the high level radioactive waste repository, 6; Analysis of the in-situ grouting test results using Gustafson and Stille model

Tsuji, Masakuni*; Nobuto, Jun*; Okihara, Mistunobu*; Sugita, Yutaka; Fujita, Tomoo; Shinkai, Fumiaki

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.93 - 94, 2010/09

no abstracts in English

Journal Articles

The Project for grouting development for the high level radioactive waste repository, 3; Durability test of coloidal silica grout

Sugiyama, Hirokazu*; Nobuto, Jun*; Fukuoka, Naomi; Shinkai, Fumiaki; Shimada, Shunsuke*; Koyama, Tadao*; Kijima, Masashi*; Terashima, Rei*

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.87 - 88, 2010/09

no abstracts in English

Journal Articles

The Project for grouting development for high level radioactive waste repository, 4; Development of superfine spherical silica grout

Yamada, Tsutomu*; Sekine, Ichiro*; Sekiguchi, Takashi*; Ishida, Hideaki*; Kishi, Hirokazu; Fukuoka, Naomi

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.89 - 90, 2010/09

no abstracts in English

Journal Articles

The Project for grouting development for high level radioactive waste repository, 7; Preliminary investigation for the in-situ grouting test at the grimsel test site

Nakanishi, Tatsuro; Uyama, Masao*; Tanaka, Tatsuya*

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.95 - 96, 2010/09

no abstracts in English

Journal Articles

The Project for grouting development for high level radioactive waste repository, 5; In-situ grouting experiment at the Horonobe URL

Kishi, Hirokazu; Izumi, Atsushi; Toida, Masaru*

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.91 - 92, 2010/09

no abstracts in English

Journal Articles

The Project for grouting development for high level radioactive waste repository, 2; Relationship between basic properties and penetrability of low-alkaline cementitious grout material

Suzuki, Kenichiro*; Miura, Norihiko*; Iriya, Keishiro*; Noda, Masaru*; Kishi, Hirokazu

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.85 - 86, 2010/09

no abstracts in English

Journal Articles

Initial stress estimation of diatomaceous mudstone using hydraulic fracturing test and borehole breakout method

Nakamura, Takahiro; Sanada, Hiroyuki; Sugita, Yutaka; Kato, Harumi*

Doboku Gakkai Heisei-22-Nendo Zenkoku Taikai Dai-65-Kai Nenji Gakujutsu Koenkai Koen Gaiyoshu (DVD-ROM), p.129 - 130, 2010/09

Horonobe Underground Research Laboratory (URL) project aims at improvement of the reliability of technologies for geological disposal of high level radioactive wastes. In investigation during construction of the underground facilities, the updating and check of the validity of initial stress estimations made during surface-based investigations is one of the main issues. Thus, three boreholes were made from the niche (GL-140 m) of ventilation and east shaft, and a three-dimensional evaluation of the initial stress in Koetoi Formation was done by the method called hydraulic fracturing technique and the analysis of the borehole breakout. Moreover, the direction of the maximum horizontal principal stress had been found to be east/west in general. However, the present test showed that the direction was 26 or 46 degrees counterclockwise from east/west.

Oral presentation

Investigation of the distributed grout material in the vicinity of a fracture

Matsui, Hiroya; Takahashi, Kazuharu*; Yui, Mikazu

no journal, , 

JAEA has been studied the development of grouting technology in deep geological environment as a contract study from MTTI. As a part of this project, the investigation of distributed grout material in the vicinity of a fracture. In this investigation, a core with fracture filled in grout material was sampled and sliced. Then, sliced rock was analyzed by XRF, EPMA and three dimensional shape of filled grout in the fracture was reconstructed. The results suggested that ordinary portland cement can penetrate in a fracture with several ten micro meter aperture and averaged aperture of analyzed fracture is about 4.5 mm. Also, the methodology to understand the grout distribution in fracture scale was proposed.

Oral presentation

Development of numerical simulation code for the salt accumulation/precipitation occur in the buffer material, 2

Kimura, Makoto; Fujita, Tomoo; Sazarashi, Masami; Suzuki, Hideaki

no journal, , 

no abstracts in English

Oral presentation

Social risk on a project with underground construction

Kamemura, Katsumi*; Matsui, Hiroya; Mikake, Shinichiro; Ijiri, Yuji*

no journal, , 

There is a different kinds of "Risk" in a project with underground construction. The risk related with geological environment, which is called "Georisk", has been discussed in these days. It is very important not only giving of the technical information but also active communication with a stakeholder such as local people to get the agreements. Therefore, it is significant to response a social risk fitly. In this study, a response of social risk which is difficult to avoid in new type of project on underground construction, such as the water treatment problem in MIU (Mizunami underground research laboratory project), was analyzed based on the published information (HP, newspaper etc.) as a example.

Oral presentation

Influence of ground motion to the linac tunnel, 3; Long-period strong ground motion

Yoshimura, Aya*; Ichimura, Takahito; Kitami, Takayuki; Horiguchi, Takashi; Kawama, Itsuo*; Ouchi, Hajime*; Tsunokake, Hisao*

no journal, , 

no abstracts in English

Oral presentation

A Study of calibration method for groundwater flow model considering grouting effect

Kumamoto, So*; Shimo, Michito*; Saegusa, Hiromitsu; Oyama, Takuya

no journal, , 

no abstracts in English

Oral presentation

Studies on the design method of multi tunnels in geological disposal facility

Hayashi, Katsuhiko; Kishi, Hirokazu; Takebe, Atsuji*

no journal, , 

The geological disposal facility for high-level radioactive waste has the new structure that consists of many tunnels in parallel (multi tunnels). Our organization designed this facility by using single tunnel model at the beginning, however we realized that this method can not predict where is Excavation disturbed zone that is caused by excavation as multi tunnels characteristics. Now we are investigating the new design methodology with multi tunnel models that takes into account of their behavior for improving design accuracy.

Oral presentation

In-situ experiment using low-alkaline cement shotcrete, 1; Mix design of composition of the shotcrete for the underground gallery support

Noguchi, Akira; Nakayama, Masashi; Kishi, Hirokazu; Kitagawa, Yoshito*; Minamide, Masashi*

no journal, , 

We are researching about the low alkaline cement applying to support of galleries for high-level radioactive waste repositories. In March, 2009, we performed a experiment of shotcrete with low alkaline cement whose proportion of the binder is 40% of ordinary portland cement, 20% of silicafume and the rest 40% of flyash. By selecting the proportion 30% water binder ratio and adding superplasticizer, the slump was 23 cm and compressive strength of the hardened concrete was 38.3 MPa. This proportion satisfied the standard of the support of the Horonobe Underground Research Laboratory whose compressive strength is more than 36 MPa and slump is around 21cm. The rebound ratio of the shotcrete was around 13%. This value is lower than that of ordinary portland cement. So, we can expect to get a better construction environment with this shotcerte. We decided to use this proportion in the in-situ experiment at the 140 m gallery in the Horonobe URL.

Oral presentation

Estimation of groundwater properties based on geostatistical method, 1; Development of modeling

Sakurai, Hideyuki*; Honda, Makoto*; Yamamoto, Shinya*; Suzuki, Makoto*; Sanada, Hiroyuki; Sugita, Yutaka; Matsui, Hiroya

no journal, , 

This paper proposes a geostatistical system for modeling the groundwater properties which have a correlation with the ground resistivity data obtained from widespread and exhaustive electromagnetic survey. That is, the methodology for the integration of resistivity data measured by various methods and the methodology for modeling the groundwater properties using the integrated resistivity data has been developed. The proposed system has also been validated using the data obtained in the surface-based investigations of the Horonobe URL project. Additionally, the quantification of uncertainties in the estimated model has been tried by numerical simulations based on the data. As a result, the uncertainties of the proposal model have been estimated lower than other traditional model's.

Oral presentation

Estimation of groundwater properties based on geostatistical method, 2; Discussion of uncertainty in modeling

Honda, Makoto*; Sakurai, Hideyuki*; Yamamoto, Shinya*; Suzuki, Makoto*; Sanada, Hiroyuki; Sugita, Yutaka; Matsui, Hiroya

no journal, , 

This paper proposes a geostatistical system for modeling the groundwater properties which have a correlation with the ground resistivity data obtained from widespread and exhaustive electromagnetic survey. That is, the methodology for the integration of resistivity data measured by various methods and the methodology for modeling the groundwater properties using the integrated resistivity data has been developed. The proposed system has also been validated using the data obtained in the surface-based investigations of the Horonobe URL project. Additionally, the quantification of uncertainties in the estimated model has been tried by numerical simulations based on the data. As a result, the uncertainties of the proposal model have been estimated lower than other traditional model's.

Oral presentation

Investigation of leaching behavior of low alkaline cement in Horonobe underground water environment

Hitomi, Takashi*; Iriya, Keishiro*; Nakayama, Masashi

no journal, , 

In JAEA, HFSC (Highly Fly ash contained Silica-fume Cement) in which the calcium hydroxide of cement become pozzolana is developed. Dipping test with the solution which simulated groundwater environment of Horonobe was performed, and HFSC was shown as having high leaching resistance in comparison with OPC. In addition, whereas an invasion of chloride ion was seen in the whole of the sample in the OPC, in HFSC, an invasion was seen in only the part of leached area.

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