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An Anisotropic Failure Criterion for Cross-anisotropic Soils

  • Geotechnical Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Strength anisotropy is an important feature closely related to soil microstructure characteristics. A new anisotropic failure criterion, extended from the Ogawa failure criterion, was developed to describe the strength anisotropy of cross-anisotropic soils. Nonlinearization of the failure curves of the Ogawa failure criterion was introduced to account for the nonlinear failure of cross-anisotropic soils in the meridian plane. Meanwhile, an anisotropic strength function based on fabric tensor was theoretically proposed to modify the failure strength under different loading directions and depositional angles. The evolution of the new anisotropic failure criterion in the deviatoric plane was investigated through a series of parametric studies. All of the undetermined parameters in the new criterion can be readily determined in laboratory tests. Compared with experimental results on several types of soils, the new anisotropic failure criterion showed good performance in strength prediction in the deviatoric plane, as well as predicting the peak friction angle. Finally, a linear theoretical relationship on construction of the anisotropic strength function was also elucidated and discussed. The new anisotropic failure criterion proposed in this paper can effectively predict the strength anisotropy of cross-anisotropic soils under different loading directions and depositional angles.

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Abbreviations

A:

Anisotropic variable

b:

Intermediate principal stress coefficient

C 1 ,C 2 :

Model variables of g(θ)

e 1, e 2, e 3 :

Unit vector of material coordinate system

e 1 ,e 2 ,e 3 :

Unit vector of reference coordinate system

f(A):

Anisotropic strength function

Fij :

Fabric tensor

g(θ):

Shape function

I 1, I 2 I 3 :

First, second and third stress invariants

k, ξ :

Constants of the Ogawa failure criterion

M 0 :

Critical state stress ratio

Mf :

Failure stress ratio

n:

Model constant of the new failure criterion

p:

Mean principal stress (p = (σ1 + σ2 + σ3)/3)

p 0 :

Intercept on the p-axis

pr :

Reference pressure

q:

Deviatoric stress

sij :

Deviatoric stress tensor

Tij :

Transform matrix

α:

Model constant

β:

Model constant of f(A)

Δ:

Statistical scalar of fabric anisotropy

δ:

Depositional angle

φ 0 :

Friction angle

φp :

Peak friction angle

η:

Stress ratio

ηp :

Peak stress ratio

γ:

Angle of the σ1 with respect to the z-axis

θ:

Lode angle

σij :

Stress tensor

σ 1 σ 2 σ 3 :

Major, intermediate and minor principal stresses

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Acknowledgments

This work was supported by the National Natural Science Foundation of China [Grant No.41572255], and Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology [Grant No. 2021B1212040003].

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Correspondence to Hong Sun.

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Wang, H., Sun, H., Ge, X. et al. An Anisotropic Failure Criterion for Cross-anisotropic Soils. KSCE J Civ Eng 27, 3808–3823 (2023). https://doi.org/10.1007/s12205-023-2253-8

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  • DOI: https://doi.org/10.1007/s12205-023-2253-8

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