Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 16, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Strength Controlling Method to Improve Old Embankment Dam Considering Effect of Water Content and Grading on Strength of Cement-mixed Muddy Soil
    Shinji FUKUSHIMA, Shigeru TANI, Akira KITAJIMA, Kouji NISHIMOTO
    2006 Volume 16 Issue 2 Pages 82-93
    Published: June 15, 2006
    Released on J-STAGE: May 30, 2008
    DOIhttps://doi.org/10.11315/jsde.16.82
    JOURNAL FREE ACCESS
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    Most of old earth dams were accumulated with a muddy soil in reservoir that caused the pollution and the shortage of reservoir capacity. This muddy soil is generally high-water-content and very soft clayey soil. In order to apply such a problematic soil to embankment soil, we have developed a new type method to improve an old embankment by means of the cement-mixed muddy soil. The strength and strain behavior of the cement-mixed muddy soil is influenced considerably by the water content and grading of muddy soil including the cement amount and curing period. We propose the strength control method considering the effect of the water content and grading of muddy soil on the strength of cement-mixed muddy soil.
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  • Permeability Evaluation by Water Pressure Tests with a Monotonous Pressurization in Unsaturated Foundations
    Yoshikazu YAMAGUCHI, Takuji ARAIE
    2006 Volume 16 Issue 2 Pages 94-108
    Published: June 15, 2006
    Released on J-STAGE: May 30, 2008
    DOIhttps://doi.org/10.11315/jsde.16.94
    JOURNAL FREE ACCESS
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    The application of water pressure test with a monotonous pressurization is examined to reduce the cost for dam foundation grouting. The water pressure test in its conventional form is conducted with increasing and decreasing pressure steps, i.e. a stepwise pressurization. The water pressure test with a monotonous pressurization, which a new form for a water pressure test, is conducted by increasing and decreasing without pressure steps. In this paper, we made a saturated-unsaturated seepage analysis to simulate the water pressure tests with a monotonous pressurization in an unsaturated area above a groundwater table. And we introduced a case history of the water pressure tests with a monotonous pressurization in order to verify their accuracy. Based on the results of a case history and numerical simulation, we will summarize remarks on performance and result evaluation of the water pressure tests with a monotonous pressurization.
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  • Durability of Rubber Lining Sheet Facing for the Upper Pond of Seawater Pumped Storage Power Plant
    Michio SATOU, Masayuki KASHIWAYANAGI, Yasuaki SATOU
    2006 Volume 16 Issue 2 Pages 109-119
    Published: June 15, 2006
    Released on J-STAGE: May 30, 2008
    DOIhttps://doi.org/10.11315/jsde.16.109
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    This study examined the durability of rubber lining sheet applied to the seawater pumped storage power plant. This plant was established for the demonstration test, and had been operated for five years. It was confirmed that there was no leakage of seawater, and that the sealing system of upper pond reminded in sound condition. Through the outdoor-exposure test of the EPDM waterproofing sheets, its durability under the environment of seawater was estimated. And for the premeditated maintenance, we succeeded in evaluating the life span of rubber sheet.
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  • Rapid Construction Method of Core Material Embankment in Tokuyama Dam Projects
    Mitsuhiro OIE, Satoru KAWACHI, Mikako MIYAHARA
    2006 Volume 16 Issue 2 Pages 120-131
    Published: June 15, 2006
    Released on J-STAGE: May 30, 2008
    DOIhttps://doi.org/10.11315/jsde.16.120
    JOURNAL FREE ACCESS
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    This paper will introduce a rapid construction method of core of rockfill dam. It was necessary to use huge volume, 1,000,000 m3, of core material to build core zone of Tokuyama Dam in 3 years (26 months), due to the limited construction schedule. By using "automatic radio-isotope scanning densimeter" for compaction quality check, a thick, 30 cm, layer was successfully constructed at a time and contributed for the shorter construction time. Since decreasing rate of the pore water pressure is as same as ordinary cores, it is considered as a useful method.
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