基于统计模型及有限元法的重力坝变形模量反演

Inverse Analysis of Deformation Modulus of Gravity Dam Based on Statistic Model and Finite Element Method

鉴于坝体和坝基力学参数选择的合理性对大坝结构分析及安全评价指标拟定的重要性,结合实际监测资料,提出了基于统计模型和有限元法进行重力坝坝体和坝基变形模量反演的方法,在分析地基范围取值、坝体变形模量取值对坝基变形模量反演影响的基础上,建立合适的有限元模型和统计模型,通过有限元计算拟合实测资料中的水压分量,根据最小二乘法原理反演大坝变形模量。将基于统计模型和有限元法反演混凝土重力坝变形模量的方法应用于某实际工程,结合实测资料反演了典型坝段坝基和坝体的变形模量,计算结果合理可信,精度较高。

Proper and reliable mechanics parameters of dam and foundation are the key factors for structural analysis and formulation of safety monitoring index. In this paper, inverse analysis was conducted on the basis of statistic model and finite element method. Impacts of foundation area and dam deformation modulus were studied so that the proper finite element model and statistic model could be established. Water pressure component isolated from measured data was compared with the result of finite element calculation in order to derive the practical deformation modulus of dam and foundation by least square principle. This inversion method based on statistic model and finite element method was ap plied to an actual engineering project. Analysis results show that the proposed inversion method is effective and reasonable.