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Volume 22 (2012)
- Issue 4 Pages 226-
- Issue 3 Pages 160-
- Issue 2 Pages 107-
- Issue 1 Pages 4-
Volume 22, Issue 1
Displaying 1-4 of 4 articles from this issue
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Tomoharu IWASAKI, Toshihide KOBORI, Tomohiro MASUNARI, Yoshikazu YAMAG ...2012 Volume 22 Issue 1 Pages 4-15
Published: March 15, 2012
Released on J-STAGE: March 22, 2012
JOURNAL RESTRICTED ACCESSAmong monitoring for safety management of rockfill dams, measurements of exterior deformation is one of the most important measuring items. Exterior deformation of an rockfill dam is generally measured by surveying the quantity of displacement in the horizontal and vertical directions. However, by using the above method, rapidly responding after an earthquake or in other emergencies is difficult. The global positioning system (GPS) is a system that can perform surveys quickly at relatively low cost. In this research, we applied GPS automatic displacement measurement system for monitoring of exterior deformation of rockfill dams, and this system is found to be effective based on the results applied at several rockfill dam sites.View full abstractDownload PDF (2748K)
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Morikatsu TAMASHIRO, Hiromi SHIMIZU, Hirotaka KAWASAKI, Toshihisa KASE2012 Volume 22 Issue 1 Pages 16-27
Published: March 15, 2012
Released on J-STAGE: March 22, 2012
JOURNAL RESTRICTED ACCESSSuper Falling Weight Deflectometer (SFWD) is an automatic ground diagnosis system used for investigating the ground stiffness rapidly, simply and accurately by using multi-stage loading and accumulated displacement method. Our past trial works on various ground conditions indicated that SFWD correlates well with plate loading test and in-situ CBR test, and could be used to evaluate the deformation property with high reliability. This time, SFWD was applied to base investigation and embankment quality control at Gima Dam construction site. The obtained results proved the high applicability of SFWD for evaluating the stiffness of base ground and embankment in dam construction.View full abstractDownload PDF (2469K) -
Norihisa MATSUMOTO, Nobuteru SATO, Takashi SASAKI2012 Volume 22 Issue 1 Pages 28-36
Published: March 15, 2012
Released on J-STAGE: March 22, 2012
JOURNAL RESTRICTED ACCESSThe magnitude 9.0 Tohoku earthquake occurred on March 11, 2011 near the northeast coast of Japan. The earthquake and tsunami caused enormous damage to Japan.
Immediately after the earthquake, inspection of dams was started. Generally dams performed well with minor or moderate cracking occurring at embankment dams. They withstood severe ground motion. The investigation suggests that a very long duration of ground motion and a number of subsequent strong aftershocks rendered more effects on embankment dams than on concrete dams. This paper is a report of the characteristics of seismic ground motion at dam sites during the earthquake.View full abstractDownload PDF (1028K) -
Norihisa MATSUMOTO, Nobuteru SATO, Takashi SASAKI2012 Volume 22 Issue 1 Pages 37-51
Published: March 15, 2012
Released on J-STAGE: March 22, 2012
JOURNAL RESTRICTED ACCESSThe magnitude 9.0 Tohoku earthquake occurred on March 11, 2011 near the northeast coast of Japan. The earthquake and tsunami caused enormous damage to Japan.
Immediately after the earthquake, inspection of dams was started. Generally dams performed well with minor or moderate cracking occurring at embankment dams. They withstood severe ground motion. The investigation suggests that a very long duration of ground motion and a number of subsequent strong aftershocks rendered more effects on embankment dams than on concrete dams. This paper is a report of behavior of dams during the earthquake.View full abstractDownload PDF (10863K)
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