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在摩尔-库仑强度准则、德鲁克-普拉格强度准则、线性、非线性统一强度理论和三剪强度准则的基础上,考虑二十六面单元体上3组主剪面应力及其面上的正应力、八面体剪应力及其面上的正应力及3个主应力共同作用,提出了多剪强度准则。根据已有的岩石真三轴试验结果,利用粒子群算法搜索出多剪强度准则参数并与三剪强度准则及双剪统一强度准则、摩尔库伦强度准则、三剪能量屈服准则相比较,结果表明该强度准则与试验结果吻合较好,适应于不同种类的岩石。另针对多数强度准则只在子午面或π平面作定性分析的情况,特别增加了σ1-σ2平面上的直接比较,结果表明,该强度准则具有非常好的适用性及推广价值。
Based on the Mohr-Coulomb strength criterion, the Drucker-Prager strength criterion, the linear and nonlinear unified strength theory and the three-shear strength criterion, On the normal stress, octahedral shear stress and the surface of the normal stress and the three principal stresses together, proposed multi-shear strength criteria. According to the existing true triaxial test results of the rock, particle swarm optimization algorithm is used to search the parameters of the multi-shear strength criterion and compared with the three-shear strength criterion, the two-shear unified strength criterion, the molar coulomb strength criterion and the three shear energy yield criterion The strength criterion is in good agreement with the test results and adapts to different types of rocks. In addition, the direct comparison on the σ1-σ2 plane is particularly emphasized when most of the intensity criteria are only qualitatively analyzed in the meridional plane or the π plane. The results show that the strength criterion has very good applicability and promotion value.