岩土类介质强度准则新探

在分析Mohr-Coulomb强度准则和双剪统一强度准则的基础上，提出了主剪面应力对以及主剪面应力对的作用这2个新概念，并以此为出发点，通过考虑十二面体单元主剪面上所有3个主剪应力对的共同作用，提出了一个有关岩土类介质的新强度准则。对该准则所作的极限线分析、应力摩尔圆分析、中间主应力效应曲线分析、破坏角分析以及实验对比分析表明，所提准则均能较好地反映岩土类介质的强度和破坏特征。

NEW RESEARCH ON FAILURE CRITERION FOR GEOMATERIAL

Two new concepts about the principal shear stress couples and their actions are proposed through the analysis of Mohr-Coulomb criterion and the twin shear criterion. Based on these concepts,a new failure criterion is given out for geomaterial. The effect of the whole three principal shear stress couples acting on the dodecahedral element should be taken into account in the establishment of failure criterion. Theoretical analyses about the loci on the p plane,the Mohr circles on the s-t plane,the effect curves of the medial principal stress and the directions of the failure surface show that the proposed criterion can basically reflect the true failure and strength characteristics of geomaterial with the verification of experimental facts.