Abstract
Since cross-anisotropic sand behaves differently when the loading direction or the stress state changes, the influences of the loading direction and the intermediate principal stress ratio (b = (σ 2 − σ 3)/(σ 1 − σ 3)) on the initiation of strain localization need study. According to the loading angle (angle between the major principal stress direction and the normal of bedding plane), a 3D non-coaxial non-associated elasto-plasticity hardening model was proposed by modifying Lode angle formulation of the Mohr–Coulomb yield function and the stress–dilatancy function. By using bifurcation analysis, the model was used to predict the initiation of strain localization under plane strain and true triaxial conditions. The predictions of the plane strain tests show that the major principal strain at the bifurcation points increases with the loading angle, while the stress ratio decreases with the loading angle. According to the loading angle and the intermediate principal stress ratio, the true triaxial tests were analyzed in three sectors. The stress–strain behavior and the volumetric strain in each sector can be well captured by the proposed model. Strain localization occurs in most b value conditions in all three sectors except for those which are close to triaxial compression condition (b = 0). The difference between the peak shear strength corresponding to the strain localization and the ultimate shear strength corresponding to plastic limit becomes obvious when the b value is near 0.4. The influence of bifurcation on the shear strength becomes weak when the loading direction changes from perpendicular to the bedding plane to parallel. The bifurcation analysis based on the proposed model gives out major principal strain and peak shear strength at the initiation of strain localization; the given results are consistent with experiments.
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Abbreviations
- A :
-
The fitting parameter for stress–strain relationship
- A d :
-
Parameter of stress–dilatancy
- b :
-
Intermediate principal stress ratio
- C 1, C 2, C 3 :
-
Parameters of the criterion of strain localization
- \(C_{ijkl}^{np}\) :
-
Non-coaxial compliance tensor
- \(d{\tilde{\mathbf{\sigma }}}\) :
-
Vectorial notations of the stress increment tensor
- \(d{\tilde{\mathbf{\varepsilon }}}\) :
-
Vectorial notations of the strain increment tensor
- D :
-
Dilatancy function
- \(D_{ijkl}^{e}\), D e :
-
Elasto-plastic modulus tensor
- \(D_{ijkl}^{p}\), D p :
-
Plastic modulus tensor
- \(D_{ijkl}^{\text{ep}}\), D ep :
-
Elasto-plastic modulus tensor
- (D ep)sys :
-
Symmetric part of elasto-plastic modulus tensor
- E :
-
Elastic modulus
- e :
-
Void ratio
- e ij :
-
Deviatoric strain
- F :
-
Yield function
- \(g(\theta_{\sigma } )\) :
-
Shape function in deviatoric plane
- G :
-
Pressure-dependent shear modulus
- G 0, G 01, G 02 :
-
Regression constant of elastic shear modulus
- H p :
-
The hardening modulus
- H t :
-
Non-coaxial hardening modulus
- J 2 :
-
Second stress invariant
- K :
-
Bulk elastic modulus
- L i :
-
The loading direction
- l i :
-
The unit vector specifying the loading direction
- M :
-
Stress ratio
- M f , M f0, M f1 , M f2 , M f3 :
-
Peak stress ratio
- M d :
-
Dilatancy–stress ratio
- n :
-
The unit vector which is normal to the shear band
- p :
-
Mean stress
- p at :
-
Atmospheric pressure
- q :
-
Equivalent shear stress
- Q :
-
Plastic potential
- s ij :
-
Effective deviatoric stress
- S ij :
-
Stress tensor independent of δ ij and s ij
- W 2 :
-
Second-order work
- β :
-
The shear strength difference between triaxial tension compression conditions
- δ ij :
-
Kronecker delta
- δ :
-
Angle between the major principal stress and the normal of bedding plane
- ε ij :
-
Strain tensor
- \(\varepsilon_{s}^{p}\) :
-
Equivalent plastic shear strain
- ε v :
-
Volumetric strain
- φ, φ c, φ E :
-
Friction angle
- Ω1 :
-
Cross-anisotropic parameter
- ξ, η :
-
Shear band angle
- \(\dot{\lambda }\) :
-
Plastic multiplier
- Ν :
-
Poisson ratio
- σ ij :
-
The stress tensor
- θ :
-
Equals to \({\pi \mathord{\left/ {\vphantom {\pi 6}} \right. \kern-0pt} 6} + \theta_{\sigma }\)
- \(\theta_{\sigma }\) :
-
Lode angle
- σ ij :
-
The stress tensor
- \(\zeta\) :
-
Angle between the intermediate principal stress and fabric tensor
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Acknowledgements
The financial supports by National Science Foundation of China (NSFC through Grant Nos. 11372228 and 41672270) and National Key Research and Development Program (through Grant No. 2016YFC0800202) are gratefully acknowledged.
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Lü, X., Huang, M. & Qian, J. Influences of loading direction and intermediate principal stress ratio on the initiation of strain localization in cross-anisotropic sand. Acta Geotech. 13, 619–633 (2018). https://doi.org/10.1007/s11440-017-0582-9
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DOI: https://doi.org/10.1007/s11440-017-0582-9