Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 20, Issue 4
Displaying 1-3 of 3 articles from this issue
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  • Safety Evaluation of Asphalt Face Dam during Earthquake
    Yoshio NAKAMURA, Masaru SHIMAZAKI, Kunitomo NARITA, Tetsuo OKUMURA, Yo ...
    2010 Volume 20 Issue 4 Pages 212-223
    Published: December 15, 2010
    Released on J-STAGE: December 20, 2010
    DOIhttps://doi.org/10.11315/jsde.20.212
    JOURNAL FREE ACCESS
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    The asphalt mixtures have rather strong dependencies on strain rate and temperature in their mechanical behaviors, so that they are likely suffered serious damages during earthquake in winter seasons or in chill regions. In the present paper, some characteristic features of severe cracking damages, observed during an earthquake in winter in asphalt facing impervious zone of an earth dam, are first studied. FEM dynamic response analysis of the embankment is then made to understand its behavior during earthquake, in order to examine overall stability against circular sliding and cracking potential due to cyclic strain developed in the impervious zone. The concept of accumulated damage is introduced to evaluate earthquake cracking damages in the facing zone of asphalt mixture, and the usefulness of the proposed method is confirmed by applying it to the present case studies.
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  • Fundamental Study on Protective Measures for Deterioration of Dam Rock Foundation
    Toshiyuki TEMMYO, Hiroyuki YAMAMOTO
    2010 Volume 20 Issue 4 Pages 224-232
    Published: December 15, 2010
    Released on J-STAGE: December 20, 2010
    DOIhttps://doi.org/10.11315/jsde.20.224
    JOURNAL FREE ACCESS
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    The rock surface exposed long term during the dam-foundation-excavation period is usually covered with spray mortar. However, there are few case studies to evaluate its effectiveness; moreover, the spray mortar has a problem of industrial waists emissions. As for the material for the protection on the rock surface, in addition to mortar, water-based emulsion resin, which was cheaper and easier to handle, were tested to review the ability to use as the alternative materials. A year exposing test for in-situ rock surface and repeated cycles of wet and dry test for slaking rock samples has conducted to evaluate the deterioration inside of the covered rock by X-ray CT method.
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  • Dam Facility Management System Based on 3D Model
    Takeshi YOSHIDA, Makoto KATOZUMI, Kazumasa OOE, Shuhei YAMAGUCHI
    2010 Volume 20 Issue 4 Pages 233-238
    Published: December 15, 2010
    Released on J-STAGE: December 20, 2010
    DOIhttps://doi.org/10.11315/jsde.20.233
    JOURNAL FREE ACCESS
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    On-the-site dam management includes many items such as a dam body, related facilities, reservoirs, and so on, over the upstream and the downstream areas. The safety management requires maintaining prescribed functions regardless of the scale and the frequency of troubles, the experience and knowledge of managers, and the degree of emergency. On the other side, the information of inspection and repair records and every kind of monitoring data are needed to be updated one by one, and this information is utilized for the efficient maintenance management. This paper introduces three-dimension modeling information management, which enables engineers who have not been engaged in survey or design or construction works to understand the conditions of the dam.
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