Fill dam's riprap plays a roll preventing rock material from movement and erosion. For stability of fill dam it's important to maintain riprap's function. At Doyoh dam, our company's dam, state of riprap materials are observed by comparing the old and new pictures in addition of our patrol and inspection. This time as new technology with the use of UAV, rock type and degradation state of riprap material were surveyed and evaluated.
The historical change (1931 to 1966) in Standard Specification of Concrete Structure prepared by the Japan Society of Civil Engineers is reviewed. It is considered how to determine design strength of concrete for dams with safety in this paper.
The historical change (1967 to 2001) in Standard Specification of Concrete Structure prepared by the Japan Society of Civil Engineers is reviewed. It is considered how to determine design strength of concrete for dams with safety in this paper.
The historical change (1931 to 2013) in Standard Specification of Concrete Structure prepared by the Society of Civil Engineers is reviewed. It is considered how to determine design strength of concrete for dams with safety.