- Issue 4 Pages 252-
- Issue 3 Pages 181-
- Issue 2 Pages 128-
- Issue 1 Pages 5-
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Isao NAGAYAMA2019 Volume 29 Issue 1 Pages 5-16
Published: March 15, 2019
Released on J-STAGE: March 21, 2019
JOURNAL FREE ACCESSThe slip circle method is commonly used in the stability analysis of embankment dams, earth embankments and natural slopes. But, the principal theory of the slip circle method has been not understood precisely and is often misused in the practice field. The theory of the slip circle method is reviewed strictly from the viewpoint of the theory of vector calculus and the elastic theory. The effect of statically indeterminate force on the slope stability in the Fellenius method is analyzed numerically.
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Hideki SODA, Eiji TAKEUCHI, Hideki NARITOMI, Kiyoshi KISHIDA2019 Volume 29 Issue 1 Pages 17-27
Published: March 15, 2019
Released on J-STAGE: March 21, 2019
JOURNAL FREE ACCESSIwaya Dam managed by Japan Water Agency (JWA) is a rockfill dam of 127.5 meters high, 40 years after construction. In Iwaya dam, seepage increased with turbidity from November to December 2013, and the increase amounted to about 100 L/min in one month. In response to this, JWA upgraded the on-site monitoring system, investigated the cause, and established a panel of experts on dam safety. After that, it stabilized for more than 1 year ago. And the seepage decreased in 2016. On the other hand, cause of the increase in seepage is still unknown. JWA decided to continue regular safety management as aiming to the recurrence of the event. This paper shows the process from the increase to the current safety management.
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