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Jennings抗剪强度准则以节理和岩桥抗剪强度参数按连通率加权平均的方式求取非贯通节理岩体的峰值抗剪强度,未考虑直剪试验过程中岩桥力学参数逐步弱化的影响,计算所得的抗剪强度与直剪试验结果存在较大偏差。基于人工齿状共面非贯通节理岩体的直剪试验,采用以剪切位移为变量的岩桥弱化度模型考虑岩桥力学参数弱化对抗剪强度的影响,提出改进的Jennings抗剪强度准则。考虑岩桥力学参数弱化的Jennings抗剪强度准则的计算结果更为接近试验值,表明考虑岩桥力学性质弱化是合理的。
Jennings shear strength criterion The peak shear strength of the non-through jointed rock mass is calculated by the weighted average of the connection and shear strength parameters of the joint and the rock bridge without considering the influence of the gradual weakening of the mechanical parameters of the rock bridge during the direct shear test, Calculated shear strength and direct shear test results there is a big deviation. Based on the direct shear test of artificial dentate coplanar non-through jointed rock mass, the influence of the weakening of rock mechanical parameters on the shear strength is taken into account by the weakening degree model of rock bridge with shear displacement as variable, and the improved Jennings shear strength criterion . The calculation of Jennings shear strength criterion considering the weakening of mechanical parameters of rock mass is closer to the experimental value, which shows that it is reasonable to consider the weakening of mechanical properties of rock mass.