Based on the characteristic of geology and structure of Gutianxi dam, a compound model involving indicative variable is given through the calculation of three dimensional FEM.
根据古田溪三级大坝的地质和结构特性,通过三维有限元计算,建立了含有指示变量的混合模型,并利用分离出的时效分量,得出大坝垂直位移变形两次"突变"疑点分别是由左岸沉陷基点基础不稳定和地震等荷载造成的结论,同时证明含有指示变量的混合模型是分析突变成因行之有效的方法。