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Abstract According to the five most common failure criteria considering the influence of intermediate principal stress，the corresponding internal friction angle expressions considering the influence of intermediate principal stress are deduced. The relationships between internal friction angle and intermediate principal stress coefficient under true triaxial stress are established；and it is a new perspective of discussing the influence law of intermediate principal stress. Based on the comparison with the true triaxial test results of gravelly soil，dense sand and loess，the reflection degree of the intermediate principal stress considered in each criterion is studied and the applicability is discussed with the quantitative analysis of standard deviation. The study results show that the five criteria reflect intermediate principal stress to different extents. The fitting effect of Drucker-Prager criterion is the worst and that of modified Lade-Duncan criterion is the best，while the fitting effects of the other three failure criteria are almost the same. Different criteria should be chosen for different materials.
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Received: 13 May 2010
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2011, Vol. 30 
