三轴试验确定抗剪强度参数的计算方法

Calculation Methods of Parameters of Shear Strength by Triaxial Compression Test

根据摩尔-库仑破坏准则,推导了通过三轴试验计算岩石抗剪强度参数粘聚力和内摩擦角的线性回归公式,指出了三轴试验线性回归计算岩土抗剪强度参数尽管有不同表达形式,但并无实质性差异。在此基础上,提出了基于粒子群算法的三轴试验确定抗剪强度的方法,应用实例表明,该方法是可行的,对于非线性抗剪强度研究,粒子群算法具有更好的应用前景。

According to Mohr-Coulomb failure criterion, Linear regression formulae to calculate rock＇s shear strength parameters （ cohesion and internal friction angle） based on triaxial compres- sion test were derived. In this paper, it was pointed out that there are different expression forms of linear regression formulae of rock＇s shear strength parameters ,but there is no essential differ- ence between them. On this basis, a method based on particle swarm algorithm to determine parameters of shear strength by tri- axial compression test is presented. The application demonstrates that the method is feasible. Particle swarm algorithm has good prospect of application in study of nonlinear shear strength.