丰满混凝土重力坝材料参数识别研究

Material parameter identification for concrete gravity dam of Fengman Project

根据丰满大坝坝顶水平位移观测资料， 采用逐步回归方法分离出坝顶水平位移水压分量， 以最小二乘目标函数为基础， 建立了正则化最小二乘参数识别方法， 数值计算结果表明， 该参数识别方法对于基于坝顶水平位移识别坝体混凝土的弹性模量和坝基岩石的弹性模量是行之有效的， 并且具有良好的稳定性和较快的收敛速度， 参数识别结果表明大坝混凝土的弹性模量与现场取芯实验结果基本一致．

Based upon the observed displacement data of the dam crest,the component of horizontal displacement caused by impounded water has been separated by using progressive regressive method.According to the least square object function,the normalized least square parameter identification method has been established.The numerical computation results show that this method is effective for identifying elastic moduli of dam concrete and rock basement based on crest horizontal displacement.The method possesses good stability and quick convergence speed.The forecast concrete modulus is in good agreement with the insitu test result.