Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 2, Issue 5
Displaying 1-5 of 5 articles from this issue
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  • Visualization of Failure Process of Granular Structure Models by Laser-Tomography
    Kazuo KONAGAI, Choshiro TAMURA
    1992 Volume 2 Issue 5 Pages 5-12
    Published: March 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.2.5
    JOURNAL FREE ACCESS
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    In order to study dynamic stability of such granular structures as rock fill dams, rockmounds in the water and so on, a new experimental technique to visualize dynamic behaviorof particles interlocking in a model was developed. In the proposed method, a model ismade of glass particles and is put in the liquid with the same refractive index. Since theglass surface of fracture is chemically active, optical property of he surface differesslightly from what it used to be before fracture. Thus, by letting a laser-light-sheetpass through the model, it becomes possible to observe contour of each particle on thislight-sheet outlined by the diffused light. And, scanning of the laser-light-sheet enablesus to analyse the whole motion of the model.
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  • Application of Back Analysis Procedure to Dam Engineering Problems
    Takashi HASEGAWA, Akira MURAKAMI
    1992 Volume 2 Issue 5 Pages 13-21
    Published: March 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.2.13
    JOURNAL FREE ACCESS
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    This paper describes the formulation of the back analysis procedure based on the extended Kalman filtering in conjunction with finite element effective stress analysis. The application of the back analysis procedure to several dam engineering problems is also discussed from the viewpoint of safety assessment of the dam and its foundation. Numerical studies reveal the applicability of the back analysis procedure to the prediction of dam behavior and provide useful information for the design of measuring locations.
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  • A Study on Mix Design of RCD Concrete using Large-Sized Specimens
    Isao NAGAYAMA
    1992 Volume 2 Issue 5 Pages 22-32
    Published: March 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.2.22
    JOURNAL FREE ACCESS
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    RCD Concrete is lean and extremely stiff concrete compacted by vibrating rollers, and is used in the RCD (Roller-compacted Concrete for Dams) Construction Method which has been developed as the rapid and economical construction of concrete dams. The properties of RCD concrete are determined not only by its mix proportion but also by compaction energy given to it.
    In this paper, the large-sized specimens of RCD concrete are tested and the properties of RCD concrete are studied. The new procedure of mix design of RCD concrete is also proposed.
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  • AN EXAMINE ON THE STABILIZED SOIL FOR SLOPE PROTECTION
    K. OHYABU, H. TAHARA, Y. ENDOH, Y. YOSHIHISA
    1992 Volume 2 Issue 5 Pages 33-40
    Published: March 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.2.33
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    The stabilized soil, which is made of soil and cement by mixing has been used for subgrades and base courses. In recent years, the stabilization has been extended to a variety of purposes, such as soil improvement against the soft ground.
    As for the example of the application of the stabilized soil, the examine case is described in this report for the stabilization of the slope in a reservoir to increase durability against erosions by waves and the others.
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  • Study on the Durability of Poor Rock as Internal Aggregate for Cncrete of Dame
    Tadao Honjyo, Takahisa Hikichi
    1992 Volume 2 Issue 5 Pages 41-51
    Published: March 15, 1992
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.2.41
    JOURNAL FREE ACCESS
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    The andesite being around the Oyamadam site is good in quality as the aggregate for concrete of dams and has been used in many dam cnstructions. But if the necessary amount of the andesite is picked in the quarry sites of the Oyamadam site, plenty of auto breccia ted andesite lava whitch is inferior to the andesite comes out at the same time and the cost of disposing it and slope protection of the quarry sites becomes large.
    This paper shows the result of a study about application of Yabakei welded Tuff (YWT) to the aggregate for internal concrete of dams. YWT exists in large quantities near the Oyamadam site and is not so good in quality from the view points of Standards that it has not been used as aggregate. In this study various tests on YWT itself and the concrete of it, for example tests for soundness of aggregates, compressive strength, freezing and thawing and so on were carryed out. It is recognized that YWT is good aggregate for internal concrete of dams from the results of these tests.
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