岩土介质非线性弹性本构关系位移反分析

Back-analysis of Nonlinear Elaseic Model of Soil

针对基坑开挖过程中土体的非线性弹性变形,本文采用邓肯-张模型进行反演计算,用非线性弹性有限元法模拟基坑的开挖过程。在此基础上发展了考虑施工过程的非线性弹性位移的优化反分析技术,该技术采用全局优化的遗传算法,根据地下连续墙位移量测值反演土体中相对敏感的参数K、c,所得结果较为理想。

To nonlinear elastic deformation of soil during the excavation of pit foundation,this paper proposes nonlinear elastic model with DuncanChang model to stimulate construction process;besides,nonlinear elastic backanalysis on staged construction is used.With genetic algorithm of global optimization,the relatively sensible parameters K,c of soils is back calculated with the measured displacement of D/wall.The calculated result is good.