离石黄土加荷-湿陷全过程的结构特性及本构模型研究

Study on Structural Characteristics and Constitutive Model of Lishi Loess about Loading-collapsible Process

基于试验研究与数据分析,认为离石黄土的土体由孔隙和团聚体组成,相应地将离石黄土的结构效应划分为土体空间效应和联结效应。进一步将离石黄土的联结效应细分为荷载联结效应和浸水联结效应,荷载联结效应为线性变形,浸水联结效应为非线性变形。提出“湿陷应变”的概念,对其进行等效化的数值计算,得到应力-湿陷应变曲线,并通过引入和新建理想物体模型,建立离石黄土的压缩-湿陷力学模型,推导该模型的本构方程。

Through experimental research and data analysis,it is considered that the soil of lishi loess is composed of pores and aggregates.Accordingly,the structural effects of Lishi loess are divided into soil spatial effect and linkage effect.On the basis of previous studies,the linkage effect of Lishi loess is subdivided into load linkage effect and flooding linkage effect.The load linkage effect is linear deformation,and the flooding linkage effect is nonlinear deformation.The concept of collapsible strain is put forward,and equivalent numerical calculations are performed on it.In addition,the stress-collapsible strain curve is gotted.And by introducing and creating a new ideal object model,a mechanical model of the compression-collapsibility of Lishi loess is established,and the constitutive equation is deduced.