According to the initial body design of the Sanhekou double-curvature arch dam and the topography and geological condition of the dam site area,the finite element model is established,which can reflect the interaction between the dam concrete and the bedrock. The Saptis and the multi-parameter yielding model is used,which can reflect the strength characteristics of dam structure to conduct the elastic and nonlinear analysis of the whole structure and study the stress conditions and loading capacity of the i...