A novel transversely isotropic strength criterion for soils based on a mobilised plane approach

Abstract

The peak shear strength rules of transversely isotropic soils are stress state dependent and dependent on relative orientation between bedding plane and principal stress. Accordingly, the shear strength of transversely isotropic soils exhibits two primary characteristics: (i) the strength curve on the deviatoric plane is asymmetrical with respect to three principal stress axes; (ii) the shear strength changes with the direction angle of the bedding plane when the intermediate principal stress coefficient is a constant. In this paper, the mobilized plane is introduced and used to reveal the failure mechanism of soils. By projecting the microstructure tensor of transversely isotropic soils onto the normal of the mobilized plane, the directionality of the transversely isotropic soils is introduced into the friction rules on the mobilized plane, and a transversely isotropic strength parameter is proposed. The proposed strength parameter can extend isotropic strength criteria into transversely isotropic strength criteria. This mobilized plane approach is used to establish a novel transversely isotropic nonlinear unified strength criterion (TI-NUSC). The difficulty to establish a unified description of the asymmetrical strength curve and its evolution with direction angle is overcome by the established criterion. Comparisons between available test results and the TI-NUSC shows that the TI-NUSC can successfully describe these two primary peak strength characteristics.

Vertical and rocking motions of a flexible strip foundation placed on a layered transversely isotropic poroelastic half‐space

“…The above researches 19–22 simply regarded soils as a homogeneous medium, neglecting the anisotropic characteristics and stratifications. According to substantial experimental data, 23,24 the natural behavior of sedimentary soils is usually compatible with an ordinary transversely isotropic model. Waves propagations in layered transversely isotropic media are more complicated due to the axis of the material symmetry as well as the reflection and transmission between the adjacent layers.…”

Fractional elastoplastic constitutive model for soils based on a novel 3D fractional plastic flow rule

“…where (np, nq, nθ)=(g/p, g/q, g/θ) represents the plastic strain increment direction. Two orthogonal planes, i.e., the meridian plane and the deviatoric plane, are used to analyse characteristics of models (Khalili and Liu, 2008;Yao et al, 2009;Lu et al, 2018). The current stress state point A can thus be represented in the meridian plane with the stress Lode angle θ (θ is equivalent to the intermediated principal stress coefficient b, namely, ) and…”

Effect of Loading Path on the Mechanical Properties of Completely Decomposed Granite Soil Based on the Multiscale Method

“…e shear strength parameters of the CDG can also be used for the stability calculation of the excavation slope [19,20]. Meanwhile, understanding the relationship between secant modulus and unloading modulus and confining pressure is crucial to evaluate the deformation of infrastructures such as filled subgrade settlement or tunnel uplift problem involving the weathered granite profile [21][22][23][24][25].…”