拱坝基础垫座体形优化模型研究

Study on Optimization Model for Arch Dam Pedestal Shape

在深“V”形峡谷处建造拱坝,为了改善坝体应力状态,常在坝体底部设置混凝土垫座。为寻求最优的垫座设计方案,构建了混凝土垫座体形参数的优化模型,并采用有限元法对该模型进行了分析求解。结合某工程分析表明,坝体等效应力在每一垫座高度上的变化规律大致相同,且与垫座高度呈负相关,根据每一高程最优点与体积的关系,求得垫座体形的最优解。

In order to improve the stress state of dam body,the concrete pedestals are often placed at the bottom of arch dam when the arch dam is built in deep V-shape canyon.In order to find the optimal pedestal design scheme,the optimization model for concrete pedestal shape parameters is constructed,and the model is solved by finite element method.The study of an actual engineering shows that the variation law of the equivalent stress of dam body on each pedestal height is about the same,and it is negatively correlated with the height of pedestal.According to the relationship between the best points of shape parameters and the volume at each elevation,the optimal shape parameters of pedestal are finally obtained.