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Abstract Based on the plastic potential theory，the numerical scheme in FLAC3D of the triple shear energy constitutive model suggested by the authors is studied. The numerical format of the model is derived，and the corresponding UDM interface codes are programmed. Considering that under conventional triaxial condition，the triple shear energy criterion is simplified to the Mohr-Coulomb criterion，the triple shear energy model and the Mohr-Coulomb model are used to numerical simulation of sample triaxial test. The two models give almost completely the same results，which verify the validity of the numerical scheme and the codes. Then the engineering application of the triple shear energy model is researched. The Prandtl analytic solution，the Mohr-Coulomb model，and the triple shear energy model are used to analyze the foundation bearing capacity. Because the Prandtl analytic solution is based on the Mohr-Coulomb criterion，the results of the Mohr-Coulomb model and the Prandtl analytic solution are almost the same. Owing to the consideration of the intermediate principle stress effect in the triple shear energy criterion and the lack of consideration in the Mohr-Coulomb criterion，the Prandtl analytic solution and the Mohr-Coulomb model are both more conservative than the triple shear energy model，so the limit bearing capacity computed by the former two is smaller than that of the latter.
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Received: 20 March 2011
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2011, Vol. 30 
