Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 12, Issue 4
Displaying 1-4 of 4 articles from this issue
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  • Bed Load Transportation Characteristics of Rectangular Open Channels
    Josuke KASHIWAI, Kiyotaka INOUE
    2002 Volume 12 Issue 4 Pages 256-267
    Published: December 15, 2002
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.12.256
    JOURNAL FREE ACCESS
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    From the viewpoint of sustainable use of dam reservoir and conservation of river environment, it is expected to release the inflow sediment to a dam downstream. In order to release the sediment, hydraulic structures such as bypassing facilities and sediment flushing are generally used. In the design of these facilities, sediment particles should be smoothly passed without harmful accumulation. This paper experimentally examines the bed load transportation characteristics of rectangular channels. Authors show the relationship between sediment transportation rate and shear stress on the walls, hydraulic conditions of maximum transportation rate without accumulation in smooth channels. Authors also show the relationship between the maximum transportation rate and the bottom roughness of channels, which will be important because of the channel abrasion by flow-down sediments. Aspect ratio of a channel is appeared to be one of important parameters to estimate sediment transportation rate.
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  • Seismic Response of Trapezoid Shaped Dam: Dynamic Analysis in Consideration of Deformation of Foundation
    Masafumi KONDO, Gengo TANAKA, Hideaki KAWASAKI
    2002 Volume 12 Issue 4 Pages 268-278
    Published: December 15, 2002
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.12.268
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    Using the two-dimensional finite element model including both trapezoid shaped dam body and its foundation as elastic body, analysis of stress and deformations of dams during earthquake were carried out. On the basis of these results, the effects of dam shape and deformability of foundation on dynamic behavior of dam body were discussed. And the differences between these results and analytical results where only dam body was modelled were also discussed.
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  • Recycle of the Fine Material Collected from the Settling Basin to Fine Aggregate
    Noboru MIYAMOTO, Eiji MORITA, Ryoji EGAMI, Yuji YORA
    2002 Volume 12 Issue 4 Pages 279-290
    Published: December 15, 2002
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.12.279
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    Developing a recycling method for construction byproducts on dam projects has become a very important issue because of the large quantities involved. This report focuses on the fine material collected from the settling basin of the aggregate plant and the attempt to recycle it as a part of fine aggregate. To successfully achieve this trial, several kinds of tests were done to confirm whether there would be any bad affects on the concrete. The results show that there were no bad affects and furthermore, an improvement in workability was also confirmed in some of the mix proportion. Through this trial, the quantity of excavation volume at the quarry site was reduced. Cost reduction was achieved in addition to advancing the recycling activity of construction byproducts in our project.
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  • Investigation on Failure of Zeyzoun Dam and Safety of Other Embankment Dams in Syria
    Yoshikazu YAMAGUCHI, Yasuhiko WAKIZAKA, Fumio YONEZAKI, Shigeru TANI, ...
    2002 Volume 12 Issue 4 Pages 291-313
    Published: December 15, 2002
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.12.291
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    The Zeyzoun Dam in Syrian Arab Republic (called Syria, hereinafter) failed on June 4, 2002, and the dam is entirely washed away on a length of approximately 100m. Damages to the downstream area due to failure of the dam were tremendous. The Ministry of Irrigation (MOI) has responsibility to investigate the cause of failure of the Zeyzoun Dam. The MOI requested the Government of Japan to dispatch some Japanese experts of embankment dams and geology in order to support its works; investigation on the cause of failure of the Zeyzoun Dam and safety inspection of five other embankment dams under operation and construction. This paper has been prepared by the members of Japanese Investigation Team, based on the information obtained from results of interviews for design, construction, supervising and operation & management organizations for the Zeyzoun Dam and other inspected dams, studies of documents and data of design and construction management, and results of site investigations.
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