Methods for analyzing sliding resistance stability along the base surface of high arch dam

According to the theory for stability of motion, the failure of arch dam along the base is regarded as the problem of stability at extreme state of motion. Two methods, namely rigid\|body method and deformed\|body method, are proposed for analysis of stability. The corresponding criteria for discrimination of stability are suggested. The advantage and disadvantage of these methods are compared. By using these methods the stability of the high arch dam in Xiaowan Hydro project is studied quantitatively and the safety degree of the dam is obtained. It is concluded that the sliding will not occur except for the failure of the dam body is happened.