混凝土坝材料参数区间反演分析方法

为了充分考虑不确定性信息对大坝结构力学参数反演结果的影响,利用区间分析方法,依据大坝原型观测数据和有限元数值计算成果,构建了大坝变形区间监控模型.基于此模型,探讨了反演混凝土坝坝体、坝基弹性模量、线膨胀系数等的原理、算法等.实例分析表明,区间分析方法能充分考虑参数反演过程中的多种不确定性,可避免复杂的区间有限元计算,其形式比较简单,效率较高,能方便地应用于实际工程.

Interval back analysis for mechanical parameters of a concrete dam

In order to consider the effect of uncertain information on inversion results of the mechanical parameters of a concrete dam,according to prototype observations and finite element method results,an interval monitoring model was developed to identify the mechanical parameters of the concrete dam using the interval analysis method.Based on the model,the principles and algorithms for inversion of the dam body elastic modulus,dam foundation elastic modulus and linear expansion coefficient were discussed.The results of a case study show that the interval analysis method requires no complicated interval finite element calculation,and also has the advantages of a simple form and higher efficiency.Moreover,it can be conveniently applied to practical engineering problems.