Change in the dynamic properties of a central clay core rockfill dam subjected to intense earthquake shaking

  • T. Ohmachi
  • Vol. 18 - Issue 1, 2011

During the Iwate-Miyagi Nairiku (MJ 7.2) earthquake which occurred in Japan in 2008, the 74.4 m high Aratozawa rockfill dam with a central clay core was severely shaken, without serious damage. The earthquake acceleration exceeded 10 m/s2 at the gallery, inducing large shear strains in excess of 10-3. As a result of the large strains, the shear wave velocity and shear modulus showed a significant decrease from their initial values. The full recovery of the decreased wave velocity took almost one year.

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Change in the dynamic properties of a central clay core rockfill dam subjected to intense earthquake shaking
  • Vol. 18 - Issue 1, 2011

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