Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 7, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • An Experimental Study on Mechanical Properties of Extremely Lean Concrete
    Isao NAGAYAMA, Kazuo WATANABE, Kentaro NISHIZAWA
    1997 Volume 7 Issue 4 Pages 210-216
    Published: December 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.210
    JOURNAL FREE ACCESS
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    Mechanical properties of extremely lean concrete were studied with uni-axitial compressive tests, splitting tests and tri-axial compressive tests. The following results were obtained. (1) Extremely lean concrete can be compacted properly as long as 20 seconds of VC value is sustained. (2) The strength of extremely lean concrete is determined by the law of cement-water ratio. (3) There is no big difference between the deformability of extremely lean concrete and conventional concrete in the tri-axial test under the same rate of the confine stress to the uni-axial compressive strength.
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  • Study on Landscape Design in a Space of Dam
    Kiyotaka SUDA, Yoichi HONDA, Mitsuko KINOSHITA, Yasuhiro FUKIHARA
    1997 Volume 7 Issue 4 Pages 217-224
    Published: December 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.217
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    In a dam project, which is highly public and has a great impact on the regional environment, it is necessary to consider, from the initial planning stage, the harmony between the man-made structure and the surrounding natural landscape. In this paper, we showed the effectiveness of landscape assessment method using CG montage technique and discussed the possible application of Fractar dimension theory for analyzing the characteristics of landscape image.
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  • Geological Survey on the Excavated Rock Slope by the Infrared Remote Sensing
    Isamu HIRANO, Hideto NAMIKI, Junko KOIKE
    1997 Volume 7 Issue 4 Pages 225-233
    Published: December 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.225
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    Rock, foundation rock and all objects emit infrared radiation corresponding to the face temperature. The authors examined the usefulness of remote sensing method through “thermmal infrared radiation emission pyrometer” on geological survey, and compared these results with usual in situ survey results.
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  • A Monitoring of Multiple Groundwater System of Damsite by using the MGL System
    Yoshio KOSUGA, Nobuyuki IIJIMA, Masaki GOUKON, Hidehisa YANAGIMACHI
    1997 Volume 7 Issue 4 Pages 234-240
    Published: December 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.234
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    Tsutsusago Dam is located on north-western part of Miyagi prefecture. It was designed as centralcored rockfill dam. On the lefthand abutment of the dam site, groundwater stays at a very low level and raises to surcharge flood level at a long distance from the abutment. This groundwater body is considered to have a multiple water table. To analyse its behavior, the authors installed MGL (Multiple Groundwater Level Measuring) system, and monitord water level for two years. Based on these results, the design on curtain grouting is now in progress.
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  • Operation of Dams in the Hida River, Aiming at Reduction of Turbid Water
    Etsuo NOIKE
    1997 Volume 7 Issue 4 Pages 241-253
    Published: December 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.241
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    In the Hida River, hydroelectric resources have been developed for many years and there are many dams with a reservoir operating for power generation. Turbid water which has seemed to be resulted from the land development as well as the dam construction in this river basin has caused various problems. A localized heavy rain in 1958 caused the long-term persistence of turbid water, which developed a social and political problem. After that, a selective withdrawal equipment was introduced and the operational method of the dams was improved, which enabled to lighten the problem. This paper describes the details and future plan against the turbid water problem.
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  • Changes in N Value Due to Excavation
    Koshi KIMURA, Kazuya FURUKAWA, Sigeo HAGIWARA, Norihisa MATSUMOTO
    1997 Volume 7 Issue 4 Pages 254-262
    Published: December 15, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.11315/jsde1991.7.254
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    Some decrease of N value in the dam foundation was caused during excavation of an earth fill dam. Substratum of the dam consists of Quarternary sandy soil, which was verified through standard penetration test and some soil tests to qualify actual condition of its decreases. Because the relative density and internal friction angle did not show any change before and after excavation, therefore the decrease of N value did not imply the decrease of original strength (rebound, loosening). Based on these examinations, the authors have carried out boring tests to identify improving condition of N value, and verified reasoning on the relation between N value and overburden load after embankment construction.
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