摘要
层叠模型是一个强大流变模型库,层叠模型参数确定的过程也是本构关系识别的过程。在它的基础上,介绍了一种岩土材料流变本构关系的识别方法,为克服流变本构模型识别过程中强烈依赖于特定模型的不足提供了新的思路。通过目标函数对设计变量的敏感度分析选取非线性优化初始值,较有效地克服了它在流变本构模型参数确定过程中易陷入局部极值的不足,从而为非线性位移反分析法(有限元与复形优化方法相结合)提供了一种初始值选取方法。
The overlayer model is a powerful library of rheological models, and the procedure of determining the parameters of the overlayer model is also the procedure of identifying the constitutive relation. Based on this model, a novel approach of identifying the rheological constitutive relation of engineering material, is introduced to overcome the deficiency of the traditional identification procedure which relies too much on specific models. The nonlinear optimistic initial values of design variables are selected by analyzing the sensitivity of these variables with object function, then the deficiency of easily falling into local extreme point during the determination of parameters of rheological constitutive model is avoided effectively. A selection scheme of initial value in nonlinear displacement back-analysis (combined with the FEM and the complex optimization method) is also proposed.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第5期768-773,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩土力学
层叠模型
位移反分析
优化方法
Finite element method
Initial value problems
Inverse problems
Mathematical models
Optimization
Rheology
Soil mechanics
