考虑到隧道围岩塑性区的边界受到中间主应力的影响,通过对Morh-Coulomb和Drucker-Prager两个屈服准则在工程中的运用比较,结果表明在运用Drucker-Prager计算塑性区边界时围岩塑性区增大,证明中间主应力对塑性区有影响。该理论弥补了Morh-Coulomb理论未考虑中主应力对塑性区范围的影响,为工程实践提供更加安全的计算理论。 Considering that the boundary of the plastic zone in the surrounding rock of the tunnel is affected by the intermediate principal stress, the comparison between the two yielding criteria of Morh-Coulomb and Drucker-Prager in the engineering application shows that when the Drucker-Prager boundary is used to calculate the boundary of the plastic zone, The plastic zone increases, which shows that the middle main stress has an influence on the plastic zone. The theory makes up for Morh-Coulomb theory does not consider the impact of the main stress on the plastic zone range, to provide safer computing theory for engineering practice.