基于综合结构势的黄土结构性非线性本构模型研究

非线性本构模型由于其原理简单,计算方便,所以是当前工程界普遍采用的本构模型之一;但是当其应用到黄土区域工程计算时,由于结构性的存在,使得采用非饱和本构模型模拟出的结果与实际存在一定的差距。为了解决上述存在的问题,以黄土为研究对象,基于综合结构势的思想,首先分析了三轴压缩应力作用下的黄土的结构性宏观应力应变特性及其综合结构势的变化规律;进一步将综合结构势引入引入现有的非线性本构模型,建立了考虑结构性的黄土的非线性本构模型;最后通过与试验数据的对比分析,验证了该模型的合理性及预测结果的准确性。

Researching on the nonlinear structural constitutive model of loess based on comprehensive structural potential

Because of its simplicity principle, and convenient calculation, nonlinear constitutive model is used widely in practical engineering and is one model of all constitutive models used by engineer at present. But when nonlinear constitutive model is applied to engineering calculations in loess regions, there is a gap between the measured results and simulation results due to the presence structural of collapse loess. In order to solve the above problems, in this paper, collapse loess is used as the research object, and based on the idea of ??comprehensive structural potential, firstly, the structural macroscopic stress-strain behavior and its comprehensive structural potential variation laws are analyzed under triaxial compression stress conditions; Fatherly, the comprehensive structural potential is introduced into the existing nonlinear constitutive model, the nonlinear constitutive model with considering structural of collapse loess is proposed; Finally , the reasonability and accuracy of the constitutive model proposed in this paper through comparison with experimental data and numerical simulation results .