【摘要】 基于三剪统一强度准则对隧道围岩抗力系数进行了分析,并导出了围岩抗力系数的计算公式。在表征岩石的强度和变形特征时采用了三剪统一强度准则以反映中间主应力对岩石强度和变形的影响,在描述隧道围岩塑性区内的应力状态时,采用中间主应力参数法来表达不同岩体可能具有的不同塑性区应力状态。计算实例表明:隧道围岩的中间主应力对隧道围岩抗力系数有影响,考虑中间主应力效应后所得的隧道围岩抗力系数增大。更多还原

【Abstract】 The rock resistant coefficient of tunnel wall was researched based on the triple-shear unified failure criterion,which was used to interpret the impacts of the intermediate principal stress on rock failure and deformation characteristics instead of the Mohr-Coulomb failure criterion.For describing the stress states in plastic zone of tunnel wall,the intermediate principal stress parameter m was introduced to interpret the different stress states in plastic zones for different kinds of rock mass.A given example showed that the intermediate principal stress has significant impacts on the rock resistant.更多还原