Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 5, Issue 19
Displaying 1-4 of 4 articles from this issue
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  • In-Situ Test for Fracture Direction Controlled Grouting Method
    Tadahiko FUJISAWA, Akira NAKAMURA, Yoshikazu YAMAGUCHI, Hitoshi YOSHID ...
    1995 Volume 5 Issue 19 Pages 4-15
    Published: September 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.5.19_4
    JOURNAL FREE ACCESS
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    In-situ grouting test has been performed in decomposed granite foundation to establish Fracture Direction Controlled (FDC) Grouting Method. The test results have been arranged and analyzed from the following viewpoints; a) improvement of foundation in imperviousness and strength, b) specification and condition for grout injection, and c) direction of progressing fractures generated by grout. This has given us confidence in practical application of FDC Grouting Method and future subjects to tackle.
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  • Fundamental Study on Grouting Effects on Shear Strength of Rock Joint
    Yoshitada MITO, Kohkichi KIKUCHI, Naruki WAKABAYASHI, Isamu HIRANO
    1995 Volume 5 Issue 19 Pages 16-28
    Published: September 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.5.19_16
    JOURNAL FREE ACCESS
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    It is well-known that shear strength of rock mass is strongly affected by shear strength of rock joint. In this study, direct shearing tests of artifitial joints, which had been presented with referring the actual joint surface roughness, have been carried out, before and after grouting, in order to examine grouting effects on shear strength of joint. The test results showed that the cohesion of joint can be improved by grouting, but the friction angle can not. The roll of the initial cohesion of joint is also auged.
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  • Dynamic Behavior of Fill Dams for Irrigation during past Earthquakes
    Shigeru TANI
    1995 Volume 5 Issue 19 Pages 29-38
    Published: September 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.5.19_29
    JOURNAL FREE ACCESS
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    In three years from 1993 to 1995, six large earthquakes, Kushiro-Oki on January 15, 1993, Hokkaido Nansei-Oki on July 12, 1993, Hokkaido-Tohooki on October 4, 1994, Sanriku-Harukaoki on December 28, 1994, Hyougo-Nanbu on January 17, 1995, and Sorachi earthquake on May 23, 1995 occurred in Japan causing much damage to public works. In this paper, I give an outline of the seismic behavior of agricuitural fill dams during the earthquakes.
    Fill dams are particularly important structures, and thus examination of the seismic activity is extremely significant in considering seismic design of fill dams. Although no fill dams suffered destructive damage by earthquakes in the past, except for hydraulic fill dams, some small earth dams were destroyed. Elucidation of the cause of their damage is necessary to consider the earthquake resistant design of fill dams and the mechanics of earthquake-caused damage.
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  • Verification of Applied Geotomographical Result by Contrasting with Practical Dam Foundation Rock
    Isamu HIRANO, Hideto NAMIKI, Keiichirou SAKAMOTO, Junko KOIKE
    1995 Volume 5 Issue 19 Pages 39-47
    Published: September 15, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.5.19_39
    JOURNAL FREE ACCESS
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    Verification of geotomography has ever been reported through numerical analysis, but not phenomenological approach. In-situ application of geotomography is increasing in these days, therefore its accuracy must be inspected at actual rock mass throgh direct collation.
    The anthers had a chance to compare the in-situ geotomography with investigational results and rock mass of dam foundation. According to this comparison, it became clear that geotomography is useful as an auxiliary method for rock foundation survey.
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