Abstract
Most of irrigation reservoir dams were mostly accumulated with a muddy soil in reservoir that caused the pollution and the shortage of reserved water. This muddy soil generally is high-water-content and very soft clayey soil. In order to make efficient use of such a problematic soil as embankment soil, we have developed a new type method to repair the damaged embankment by means of the stabilized muddy soil with cement stabilizer. We representes the case study of sloping core zone constructed by cement-stabilized muddy soil that applied this method to reinforce the steep and high embankment of an old small earth dam, and also shows that the sloping core zone with the zoning in strength becomes a very useful method to reinforce the steep and high embankment.