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Instability of sands under axisymmetric proportional strain and stress loadings
This paper compares the pre-failure instability of sands under axisymmetric proportional strain and axisymmetric proportional stress conditions. Based on a deviatoric hardening plasticity model, the critical hardening moduli under both conditions were obtained by the second-order work criterion. In the proportional strain condition, the instability of sands depends on the stress–dilatancy relationship and the imposed strain proportion ratio. Loose sand is prone to instability; dense sand maintains stable behaviour under the undrained condition, butit may become unstable in expansive loading. In the proportional stress condition, dense sand shows stable behaviour; loose sand can be stable as long as the stress proportion is at a sufficient distance from zero. A material state-dependent elasto-plasticity model was used to predict the instability of sands in triaxial tests under the proportional strain condition, constant mean stress condition, and constant shear stress condition; the predicted instability behaviour agrees well with the experimental data.
Instability of sands under axisymmetric proportional strain and stress loadings
This paper compares the pre-failure instability of sands under axisymmetric proportional strain and axisymmetric proportional stress conditions. Based on a deviatoric hardening plasticity model, the critical hardening moduli under both conditions were obtained by the second-order work criterion. In the proportional strain condition, the instability of sands depends on the stress–dilatancy relationship and the imposed strain proportion ratio. Loose sand is prone to instability; dense sand maintains stable behaviour under the undrained condition, butit may become unstable in expansive loading. In the proportional stress condition, dense sand shows stable behaviour; loose sand can be stable as long as the stress proportion is at a sufficient distance from zero. A material state-dependent elasto-plasticity model was used to predict the instability of sands in triaxial tests under the proportional strain condition, constant mean stress condition, and constant shear stress condition; the predicted instability behaviour agrees well with the experimental data.
Instability of sands under axisymmetric proportional strain and stress loadings
Lü, Xilin (author) / Qian, Jiangu (author) / Huang, Maosong (author)
European Journal of Environmental and Civil Engineering ; 23 ; 1294-1310
2019-11-02
17 pages
Article (Journal)
Electronic Resource
English
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