改进的非定常Bingham岩石蠕变模型及参数辨识  

Modified Non-Stationary Bingham Creep Model of Rock and Its Parameter Identification

作　　者：刘伟 LIU Wei(Jinan Rail Transit Group Co.,Ltd.,Jinan 250000,Shandong,China)

机构地区：[1]济南轨道交通集团有限公司,山东济南250000

出　　处：《力学季刊》2022年第3期651-658,共8页Chinese Quarterly of Mechanics

摘　　要：传统Bingham模型适用于描述蠕变的前两个阶段,为了更加准确地描述岩体蠕变的三个阶段,本文提出了一种改进的非定常Bingham蠕变模型,并推导出其蠕变本构方程.该模型在传统Bingham模型的基础上串联一个非定常黏壶元件,并考虑岩体弹性模量及原有黏壶元件蠕变参数的非定常化.基于该模型对泥岩的蠕变试验曲线进行拟合及参数辨识,结果表明该模型具有较高的拟合精度,可以准确地描述泥岩蠕变的三个阶段,并实现了在数值软件中的应用,为实际工程提供了一种简单有效的蠕变本构模型.The traditional Bingham model is suitable for describing the first two stages of creep.In order to more accurately describe the three stages of rock creep,a modified non-stationary Bingham creep model is proposed,and its creep constitutive equation is derived in the paper.In the model,a non-stationary viscous element is connected to the traditional Bingham model,and the non-stationary properties of the rock elastic modulus and the creep parameters of the original viscous element are considered.Based on the model,the creep test curve of mudstone is fitted and the parameters are identified.The results show that the model can accurately describe the three stages of the mudstone creep,and realize its application in numerical software,providing a simple and effective creep constitutive model for engineering practice.

关 键 词：岩石蠕变 Bingham模型 非定常 加速蠕变 参数辨识 

分 类 号：TU45[建筑科学—岩土工程]