摘要
本文探讨从各种粘弹性本构模型中如何确定最佳模型问题。将工程岩体视为一个复杂系统，施工中实测获得的岩体随时间的变形视为系统的输出响应，基于解决复杂系统等价数学模型的一般原理，运用最小二乘法、非线性最优化技术和拟合度检验法，本文提出从粘弹性本构模型的一般通式中来确定具体条件下最佳模型的方法，继而用辨识得到的模型可进行时空上的超前预测，用新实测数据进行模型检验和修正，达到理论分析与指导实际工程紧密结合的目的。实例验证表明该方法是有效的和可行的。
This paper studied the determination of the optimum model from various visco -elasticconstitutive models. In this paper, rock mass, as a complex system, deforms gradully with timeunder construction. Based on the principle of complex system model, this kind of deformation isregarded as an output of the system. The paper derived a method to determine the optimummodel under specific conditions from a general formula of visco-elastic constitutive model byusing least square non-linear optimum method and fitness examination. The effectiveness andfeasibility of the method are confirmed by an example, which shows, through verifying andcorrecting by using new measured data, this method may be used in prediction of engineeringbehaviors, and a combination of theory and practice is obtained.
出处
《工程力学》
EI
CSCD
北大核心
1999年第1期18-25,共8页
Engineering Mechanics
关键词
岩体
粘弹性
本构模型
模型辨识
ock mass,visco-elasticity,constitutive model,model identification
