为优化地铁暗挖车站支护参数，提供设计依据，明确锚杆在不同预应力下支护效果的差异，采用FLAC3D建立隧道数值模型，通过锚固剂和link参数分段赋值处理实现锚杆托盘段、自由段、锚固段模拟，并赋予预应力，以某地铁6号线暗挖车站为分析对象，与常规非预应力锚杆进行对比，结合现场应用与现场监测进行结果反馈。数值计算结果显示： 1）锚杆预应力使围岩拉应力区显著减小或消失，塑性区减小； 2）改善围岩应力状态的主动支护作用明显； 3）当预应力达到40 kN以上时，拱顶塑性区消失，边墙最大拉应力为36.3 kPa； 4）当预应力为80 kN时效果显著，拱顶无塑性区，边墙最大拉应力减小到13.9 kPa； 5）现场监测数据显示，格栅钢架最大压应力为34 MPa，混凝土最大压应变为249 με，拱顶最大沉降为2.3 mm，在预应力锚杆支护下隧道安全稳定。

To optimize the supporting parameters of mined metro station, provide reference for design, and clarify the difference of supporting effect of anchor bolt under different prestress forces, a tunnel numerical model is established using FLAC3D. The anchor bolt tray section, free section, and anchoring section are simulated through the subsection assignment of anchor agent and link parameters, and the prestress is given. The anchoring effect of the prestress anchor bolt is compared with that of conventional one used in a mined metro station. The results are fed back in combination with field application and monitoring. The numerical results show the following: (1) The bolt prestress significantly reduces or disappears the tensile stress zone and reduces the plastic zone of surrounding rock. (2) The active support function that improving the stress state of surrounding rock is remarkable. (3) When the prestress reaches over 40 kN, the plastic area of the crown disappears, and the maximum tensile stress of the side wall is 36.3 kPa. (4) When the prestress reaches 80 kN, there is no plastic area in crown, and the maximum tensile stress of the side wall is reduced to 13.9 kPa, showing a remarkable effect. (5) The field monitoring data show that the maximum compressive stress of grid steel frame is 34 MPa, the maximum compressive strain of concrete is 249 με, the maximum settlement of crown is 2.3 mm, indicating that the tunnel is safe and stable under the support of prestress anchor bolt.