Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 23, Issue 1
Displaying 1-4 of 4 articles from this issue
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  • The Damage of a Rockfill Dam with Asphalt Concrete Facing and a Study of Behavior during the 2011 Touhoku Earthquake
    Tomoyuki TSUKADA, Hiroshi YAMAMOTO, Yuuki SHIMADA, Yoshihisa UCHITA
    2013 Volume 23 Issue 1 Pages 6-18
    Published: March 15, 2013
    Released on J-STAGE: April 06, 2013
    DOIhttps://doi.org/10.11315/jsde.23.6
    JOURNAL FREE ACCESS
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    The Yashio dam is the upper dam of Shiobara pumped storage power plant. It is a 90.5m high asphalt concrete facing rockfill dam. Two cracks occurred at the facing along the abutments of left and right bank and the volume of leakage increased in the 2011 Touhoku Earthquake. The maximum acceleration values were about 50cm/sec2 at the bed rock and 250 cm/sec2 at the crest respectively. They were less than the acceleration we considered at the design stage by the 2-D numerical dynamic analysis and 3-D model vibration test. We analyzed the recorded acceleration time histories and conducted a 3-D numerical dynamic analysis to pursue the mechanism of occurring of the cracks. After the studies, we found that the cracks occurred by the concentration of strain at the concrete joints on the crest of the dam, and summarized important considerations on the structure of the same type dam
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  • Fluctuation Monitoring System for Grain Size Distribution of CSG Materials using Digital Image Analysis
    Katsutoshi FUJISAKI, Izuru KURONUMA, Kenichi KAWANO, Akira TAKEI
    2013 Volume 23 Issue 1 Pages 19-26
    Published: March 15, 2013
    Released on J-STAGE: April 06, 2013
    DOIhttps://doi.org/10.11315/jsde.23.19
    JOURNAL FREE ACCESS
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    In construction work, such as a fill dam, where fill materials are used, management of the grain size distribution of material used is the basis of quality control. In order to monitor fluctuation trend of the grain size distribution, the authors have developed a new system to analyze soil material images using digital image analysis. In addition, this new system was applied to the Tobetsu dam (Hokkaido prefecture in Japan) of trapezoidal CSG dam for rationalization of the quality control during construction. In this paper, the overview of the new system and the application results to the Tobetsu dam are reported together with the development plan in the future of the new system.
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  • Rationalization of Grouting Work in Rumoi Dam
    Hiroshi YOSHIDA, Hiroshi NAGAHARA, Takanobu MORI
    2013 Volume 23 Issue 1 Pages 27-38
    Published: March 15, 2013
    Released on J-STAGE: April 06, 2013
    DOIhttps://doi.org/10.11315/jsde.23.27
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    In the Rumoi Dam, based on revision of "Guidelines for Dam Foundation Grouting", the base rock characteristics had been analysed by the results from the permeability test and the grouting under construction. Afterward, grouting was carried out along with proper improvement of grouting specification. This report addresses the consideration of rationalized grouting specification and the verification of grouting results in curtain grouting and blanket grouting of the Rumoi Dam.
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  • Influence of The Influx of Musty-Odor Producing Algae from Upstream Basin on 2-MIB Concentration in Dam Reservoir
    Fuminori KIMURA, Takamitsu HOMMA, Mitsunori MAEDA, Masahiko MATSUKAWA
    2013 Volume 23 Issue 1 Pages 39-49
    Published: March 15, 2013
    Released on J-STAGE: April 06, 2013
    DOIhttps://doi.org/10.11315/jsde.23.39
    JOURNAL FREE ACCESS
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    The taste and odor problem causing by cyanobacteria has been occurred in Kamafusa dam reservoir. However, the increasing of musty-odor substance (2-MIB) concentration has been also observed, although cyanobacteria were absent in surface water column. As one of the hypotheses to explain this phenomenon, the influx of cyanobacteria or/and 2-MIB from paddy fields located on the upstream basin was considered. We investigated the amount of cyanobacteria biomass and that of 2-MIB of the paddy fields located in the upstream basin, and estimated the influx of them into the dam reservoir through the following agricultural streams and inflow rivers. The results of this study, in process flowing from paddy fields to the dam reservoir, both cyanobacteria biomass and 2-MIB concentration has been diluted in stages. Therefore, we concluded that the impact of cyanobacteria occurred in upstream basin may be very low on development of 2-MIB concentration in the dam reservoir.
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