一、坝工建设日本的坝工建设大体分成三个阶段。第一阶段:二次大战前后,为解决粮食紧缺,所建的主要是以农业灌溉为目的的坝、堰,由于国力有限,一般工程规模较小,坝型以土坝、土石坝为主。第二阶段:五十年代至六十年代,混凝土重力坝发展较快,后期出现了混凝土轻型 First, dam construction Japan dam construction generally divided into three stages. The first stage: Before and after the Second World War, in order to solve the food shortage, the dam and weir mainly built for agricultural irrigation were built. Due to the limited national strength and the small scale of general works, the earth dam and earth-rock dam dominated the dam type. The second stage: From the 1950s to the 1960s, the concrete gravity dam developed rapidly, and later appeared the concrete light