Multi-surface Cyclic Plasticity Sand Model with Lode Angle Effect |
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Authors: | Zhaohui Yang Ahmed Elgamal |
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Institution: | (1) URS Corporation, Oakland, CA 94612, USA;(2) Department of Structural Engineering, University of California at San Diego, La Jolla, CA 92093-0085, USA |
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Abstract: | A Drucker-Prager J
2 multi-surface-plasticity sand model is modified to employ the Lade-Duncan failure criterion as the yield function. This function
includes the first and third stress invariants to account for the dependence of cyclic shear stress–strain behavior on confining
pressure and the Lode angle. Related modifications to the flow rule and hardening rule are described. Dependence of dilatancy
on confinement is also included. Salient features of the model performance are presented under general three-dimensional (3D)
loading conditions, where the yield function provides a more accurate representation of nonlinear shear response. Dynamic
response analyses of a mildly inclined infinite slope are performed to illustrate the influence of excitation direction on
the accumulation of liquefaction-induced lateral ground deformation. |
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Keywords: | Lode angle Cyclic plasticity Multi-surface plasticity Cyclic mobility Soil liquefaction Earthquake Soil dynamics |
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