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Journal Articles

Progress of shaft construcion and cycle time analysis in the Horonobe Underground Research Laboratory Project

Yamazaki, Masanao; Sekiya, Yoshitomo; Fujikawa, Daisuke; Kitagawa, Yoshito*

Chika Kukan Shimpojiumu, Rombunshu, 14, p.191 - 196, 2009/01

The shafts and drifts of the Horonobe Underground Research Laboratory Project have been constructed by JAEA. The construction method of shaft is a short step method. The East Shaft of excavation system is the blasting excavation, and the Ventilation Shaft is the machine excavation. At the present, The East Shaft has ended to G.L.-140.5 m and Ventilation Shaft has ended to G.L.-210.5 m at the end of July, 2008. The difference in depth change or a excavation system was analyzed about the excavation time which occupies about 40% of the cycle time of each shaft. This paper reports the outline of the construction track record of the shafts and the result of having analyzed cycle time paying attention to excavation time.

Oral presentation

Monitoring for chemical property of muck from deep shaft

Yamanishi, Takeshi; Sekiya, Yoshitomo; Suzuki, Tatsuya; Ito, Seiji; Kitagawa, Yoshito*; Hagihara, Takeshi*; Doi, Takashi*; Saito, Ryosuke*

no journal, , 

no abstracts in English

Oral presentation

Analysis of shaft construction cyclic time at Horonobe Underground Research Laboratory Project

Kitagawa, Yoshito*; Yamazaki, Masanao; Hagihara, Takeshi*; Minamide, Masashi*; Sekiya, Yoshitomo

no journal, , 

no abstracts in English

Oral presentation

Chemical property and future issues of control typed muck

Yamanishi, Takeshi; Sekiya, Yoshitomo; Suzuki, Tatsuya; Kitagawa, Yoshito*; Saito, Ryosuke*; Yokota, Daisuke*

no journal, , 

no abstracts in English

Oral presentation

Horonobe URL project; Status of construction of the underground facilities

Sano, Michiaki; Sekiya, Yoshitomo

no journal, , 

no abstracts in English

Oral presentation

Progress of shaft construction and future task in Horonobe Underground Research Laboratory Project

Yamanishi, Takeshi; Sekiya, Yoshitomo; Inagaki, Daisuke; Hatsuyama, Yoshihiro*; Kitagawa, Yoshito*

no journal, , 

no abstracts in English

Oral presentation

In-situ experiment of shotcrete using low alkaline cement in Horonobe Underground Research Laboratory, 2; Low alkaline cement used in the construction of a gallery

Kitagawa, Yoshito*; Minamide, Masashi*; Nayuki, Toshinori*; Yamanishi, Takeshi; Sekiya, Yoshitomo; Ito, Seiji; Sato, Haruo; Nakayama, Masashi

no journal, , 

In Japan, any high level radioactive waste repository is to be constructed at over 300m depth below surface. Tunnel support is used for safety during the construction and operation, and shotcrete and concrete lining are used as the tunnel support. Concrete is a composite material comprised of aggregate, cement and various additives. Low alkaline cement has been developed for the long term stability of the barrier systems whose performance could be negatively affected by highly alkaline conditions arising due to cement used in a repository. Japan Atomic Energy Agency (JAEA) has developed a low alkaline cement, named as HFSC (High fly-ash silicafume cement), containing over 60wt% of silica-fume (SF) and coal ash (FA). JAEA are presently constructing an underground research laboratory (URL) at Horonobe for research and development in the geosciences and repository engineering technology. HFSC was used experimentally as the shotcrete material in construction of part of the 140m deep gallery in Horonobe URL. The objective of this experiment was to assess the performance of HFSC shotcrete in terms of mechanics, workability, durability, and so on. HFSC used in this experiment is composed of 40wt% OPC (Ordinary Portland Cement), 20wt% SF, and 40wt% FA. This composition was determined based on mechanical testing of various mixes of the above components. Because of the low OPC content, the strength of HFSC tends to be lower than that of OPC in normal concrete. The total length of tunnel using HFSC shotcrete is about 73m and about 500m$$^{3}$$ of HFSC was used. This experimental construction confirmed the workability of HFSC shotcrete. Although several in-situ experiments using low alkaline cement as shotcrete have been performed at a small scale, this application of HFSC at the Horonobe URL is the first full scale application of low alkaline cement in the construction of a URL in the world.

Oral presentation

Status and future issues of neutralization of acid water using control typed muck

Yamanishi, Takeshi; Sekiya, Yoshitomo; Sataka, Hiroyuki; Kitagawa, Yoshito*; Kato, Kinya*

no journal, , 

no abstracts in English

Oral presentation

Chemical property and future issues of control typed muck at stockyard

Yamanishi, Takeshi; Sekiya, Yoshitomo; Suzuki, Tatsuya; Kitagawa, Yoshito*; Kato, Kinya*; Saito, Ryosuke*

no journal, , 

no abstracts in English

Oral presentation

Ventilation net analysis indeep underground facilities construction

Sekiya, Yoshitomo; Shimoyama, Tadashi; Anada, Hideki*; Kanatani, Tsugio*; Yamanishi, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Simulation of mine fire indeep underground facilities construction

Sekiya, Yoshitomo; Shimoyama, Tadashi; Hirakawa, Yoshiaki*; Narashima, Yoshimasa*; Yamanishi, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Leaching behavior of inorganic nitrogen spiecies from diatomaceous mudstone in Horonobe Underground Research Center

Sekiya, Yoshitomo; Kitagawa, Yoshito*; Igarashi, Toshifumi*; Hokora, Hideyuki*

no journal, , 

no abstracts in English

Oral presentation

Change in chemical form of nitrogen compounds of leachate from diatomaceous mudstone

Sekiya, Yoshitomo; Kitagawa, Yoshito*; Igarashi, Toshifumi*; Hokora, Hideyuki*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of nitrification of inorganic nitrogen in the leachate from diatomaceous mudstone

Sekiya, Yoshitomo; Kitagawa, Yoshito*; Igarashi, Toshifumi*; Hokora, Hideyuki*

no journal, , 

no abstracts in English

Oral presentation

Shortening time of the soil filtration for soil elution tests

Itabashi, Hideharu; Sekiya, Yoshitomo*; Sataka, Hiroyuki; Shimada, Tomohiro*; Kato, Kinya*

no journal, , 

no abstracts in English

Oral presentation

A Study of the segment length of the concrete shaft lining using the short step method

Hagihara, Takeshi*; Koike, Masashi*; Sekiya, Yoshitomo*; Itabashi, Hideharu; Ohara, Masatsugu

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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