ABSTRACT
ABSTRACT: The 90.5 m high 15 year old Yashio dam, which was completed in 1995, is the upper dam of Tokyo Electric Power Company’s Shiobara pumped storage power plant. There has been no leakage through the asphalt facing, and leakage through the foundation and exterior deformation of the dam body has been stable. We have measured the deformation of the asphalt facing utilizing a clinometer mounted on a vehicle towed from the crest of the dam. In addition, we have investigated the aging of the asphalt facing at the exposure test yard which was installed near the dam site on the same elevation level of the dam. We estimate that the asphalt facing was performed adequately after the aging.
