基于割线模量法的压实Q2黄土加载变形本构模型

为预估沟谷型黄土高填方的总沉降量并指导现场施工，对压实黄土的加载变形本构模型进行研究。在侧限条件下，利用自建GunaryEXT模型拟合不同初始压实度和初始含水率条件下压实黄土的应力-应变关系；在此基础上利用割线模量法建立压实黄土的加载变形本构模型；在仅考虑竖向变形的理想条件下，利用该模型预估沟谷型黄土高填方的总沉降量。研究结果表明:GunaryEXT模型可较好地拟合不同初始条件下压实黄土的应力-应变关系；加载变形本构模型预估沟谷型黄土高填方的总沉降量的方法可行，该方法的预估结果可用于指导现场施工。

Study of Load Deformation Constitutive Model of Compacted Q_2 Loess Based on Secant Modulus Method

To estimate the total settlement of high loess-filled embankment in valley type and directing site operation, this paper carries out research on the load deformation constitutive model of compacted loess. A self-defined extended Gunary modelwas used to expressthe vertical pressure-strain curves of compacted loess with different initial compaction degree and initial water contentin confined compression. On the basis, a load deformation constitutive model of compacted loess was built based on secant modulus method, and the total settlement of high loess-filled embankment in valley type was estimated by this model under the ideal conditions of considering the vertical deformation only. The results show that the vertical pressure-strain curves of compacted loess with different initial conditions can be expressed well with extended Gunary model, and it is feasible to estimate the total settlement of high loess-filled embankment in valley type by using the load deformation constitutive model. The estimated results can provide reference for the site operation of the high loess-filled embankment.