Study of Load Deformation Constitutive Model of Compacted Q₂ 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.