ABSTRACT
We will describe the performance of one Concrete Face Rockfill Dam (CFRD) and two Asphaltic Concrete Face Dams (AFRD) which were affected significantly by earthquakes. The 2008 Iwate-Miyagi earthquake caused the crest settle of 56 cm for Ishibuchi CFRD. However, the concrete facing was not affected largely. The water storage function of the dam was completely maintained. Cracks of asphalt facing were caused by The 2011 Tohoku earthquake in two AFRDs of Yashio and Numappara. The two significant cracks along the left and right abutments were found in Yashio dam. The totally 1547 m long cracks were concentrated at a vicinity of the boundary of the dam foundation and the embankment in Numappara dam. The numerical dynamic analysis was conducted in order to understand the contributing factors which could maintain the seismic stability of CFRD and to pursue the crack mechanism and design adequate remedial works for AFRDs.
