Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 6, Issue 21
Displaying 1-5 of 5 articles from this issue
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  • Application of Distinct Element Method to Estimate Impact Force by Debris Flow
    Kenji IMAMURA, Touru KANEKO, Kikuo KOGUCHI, Fukuko ISHIGURI, Akio DEGU ...
    1996 Volume 6 Issue 21 Pages 7-16_1
    Published: March 15, 1996
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.6.7
    JOURNAL FREE ACCESS
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    It is difficult to know experimentally impact force on floor and walls caused by debris flow. Particularly the maximum value of the impact force is important for designing a debris barrier.
    Since increasing computer power has made DEM (Distinct Element Method) a practical means for predicting particle motion in various flows, the authors have applied it to estimate magnitude and distribution of impact force on a debris darrier.
    Experiment and calculation on impact force by a dropping steel ball with various speed against floor was also carried out, then correction factor for calculation was introduced by comparison the experiment with the calculation.
    Impact force on debris barrier with outlet width of 3m and height of 4m is estimated as about 300kN on a floor and about 80kN on a side wall.
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  • Microbiologically Influenced Corrosion for Dam environment
    Kumiko KAMATA, Kenichi AKAMINE, Youichi HIRAI
    1996 Volume 6 Issue 21 Pages 17-23
    Published: March 15, 1996
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.6.17
    JOURNAL FREE ACCESS
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    Recently, in the sea, it is reported that potential of the stainless steel tends to be nobled by microbe. In dam, that is a fresh water environment, the same phenomenon would be predicted to occure. So, it is afraid that these phenomenon for the structure. And then, in the study, we researched about the influence of corrosion by microbe.
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  • Advanced Exploration Method using Seismic and Electromagnetic Waves-Application for Evaluation of Dam Bedrock Grouting
    Hideyo SUZUKI, Noboru YASUDA, Masashi KIMURA, Hideki SAITO, Shozo NABE ...
    1996 Volume 6 Issue 21 Pages 24-34
    Published: March 15, 1996
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.6.24
    JOURNAL FREE ACCESS
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    This paper describes the outline of the development of borehole radar system and electric discharge logging system. Those brand-new systems were tested at the dam site. The results of fundamental performance tests showed the applicability of those systems to rock investigations.
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  • Drastic Improvement in the Service Lives of Lining Plates for Twin Shaft Mixer at Dam Construction
    Shoichi ICHIHARA, Tadahiro KIMURA, Nobuhito YAGI, Seiji MAKINO
    1996 Volume 6 Issue 21 Pages 35-43
    Published: March 15, 1996
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.6.35
    JOURNAL FREE ACCESS
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    Lining plates made of high chromium cast iron are applied to the twin shaft mixer for RCD concrete manufacturing at the present time. These lining plates, however, are replaced in short time operation of 30, 000m3 to 40, 000m3 due to the concrete of dry consistency with excessive abrasions. Because of the above reasons, great pains and much efforts are required for maintenance of the lining plates.
    In order to solve these problems, we have developed new lining plate, hard-faced compound material with tungsten fine particles.
    The new-lining plates developed are installed on the mixers in the Kodama and Shimagawa dams, and are tested to verify a performance of service life. It is certified, through the performance tests, that the new-lining plate gives 5 times or more service life in comparison with conventional one and the mixer is possible to have a stable operation for a long time under no maintenance.
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  • Grouting Effects on Mechanical Properties in Alternation of Sandstone and Shale
    Kohkichi KIKUCHI, Yoshitada MITO, Kaoru NANASAWA, Yoshiharu TAKAHASHI, ...
    1996 Volume 6 Issue 21 Pages 44-52
    Published: March 15, 1996
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.6.44
    JOURNAL FREE ACCESS
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    The aim of consolidation grouting to improve permeability and mechanical properties of the foundation near the surface. Generally, the check for improvement on permeability is usually carried out, however, the check for improvement on mechanical properties is not done. Therefore, the improvement on deformability could have not been applied to the mechanical design for foundation. The authors have made an in situ experiment in order to examine the grouting effects on the deformability of rock masses. As the results, the followings were obtained;
    1. The deformability of rock masses can be improved by grouting.
    2. More deformable before grouting, higher improvement can be expected.
    3. The Theological model is suggested in order to examine grouting effects.
    4. The shear strength of rock masses can also be improvement by grouting.
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