Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
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Volume 21, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • In-Situ Experimental Studies on Improvement of Deformation of Rock Masses by Grout Treatment
    Shinji UTSUKI, Kenya MIYAMOTO, Masanori YOSHIDA, Toshihiro ASAKURA, Ko ...
    2011 Volume 21 Issue 3 Pages 167-177
    Published: September 15, 2011
    Released on J-STAGE: September 26, 2011
    DOIhttps://doi.org/10.11315/jsde.21.167
    JOURNAL FREE ACCESS
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    The purpose of consolidation grouting for dam foundation is to improve the permeability and mechanical properties of rock masses. For permeability, the grouting effect is usually confirmed by the permeability test at check holes. But for the change of mechanical properties, it has been difficult of confirmation. So, the mechanical improvement of foundation by grouting, like the changes of elasticity and strength, has not been considered in dam foundation design. In this study, an in-situ experiment was made in order to examine the grouting effect on mechanical properties of rock masses.
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  • Enhancement and Rationalization of GPS Deformation Measurements at Embankment Dams
    Nobuteru SATO, Naoki TOMIDA, Keisuke HATANO, Hideki SODA
    2011 Volume 21 Issue 3 Pages 178-189
    Published: September 15, 2011
    Released on J-STAGE: September 26, 2011
    DOIhttps://doi.org/10.11315/jsde.21.178
    JOURNAL FREE ACCESS
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    Recently automated dam body deformation measurement by GPS survey is under examination in order to enhance and rationalize the safety management of embankment dam. This paper reports the applications of GPS survey to dam body deformation measurements during the first filling of both rock fill dam and earth dam as well as long term dam body deformation measurements of rock fill dam. Furthermore, relationships between statistically processed data obtained by GPS survey and results obtained by electro-optical distance measurement are analyzed. In conclusion, the applicability of GPS survey in enhancement and rationalization of safety management of embankment dam is discussed.
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  • The Case of Dam Monitoring by GPS in NUMAHARA Dam
    Yusuke KITA, Shinji MIZUTA, Masahiko EBARA
    2011 Volume 21 Issue 3 Pages 190-195
    Published: September 15, 2011
    Released on J-STAGE: September 26, 2011
    DOIhttps://doi.org/10.11315/jsde.21.190
    JOURNAL FREE ACCESS
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    Our company began the dam displacement monitoring by GPS system applied in Numahara dam located in the Tochigi Prefecture since September, 2007. It aimed to verify the applicability of GPS in snow area, and to compare to traditional collimation method. As a result, the GPS data was high accuracy, although the sensor icing and the frost heaving occurred. And the GPS measured the detail displacement of dam during evacuation and re-storage, which could hardly measure by collimation.
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