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Comparative Study of Usual Yield Conditions in Geotechnical Engineering

SHI Gui-cai1,2 GE Xiu-run2,3(1.School of Civil Engineering & Architecture,Changzhou Institute of Technology,Changzhou 213002;2.Department of Civil Engineering,Shanghai Jiaotong University,Shanghai 200240;3.Key Laboratory of Rock and Soil Mechanics,Institute of Rock and Soil Mechanics,The Chinese Academy of Sciences,Wuhan 430071)  
Based on theoretical analysis and calculation example,the usual yield conditions in geotechnical engineering are comparatively studied,and such conclusions are drawn:whenever apply different generalized Von Mises conditions to approximate Mohr-Coulomb condition,we should select corresponding generalized Von Mises condition according to the specific problem and its material parameters.Generally,Drucker-prager condition is inclined to be conservative,and the accurate one that approximates Morh-Coulomb criterion is between interior and exterior vertex circle.Interior vertex circle is inclined to be conservative and exterior vertex circle is inclined to be dangerous as well,and so,the equal area circle is the relative well-founded compromise choice.
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