A comparison of the field monitoring data and numerical calculations of the Baoshan tunnel project shows that the numerical results that consider the support constraint effect are in better agreement with the actual project situation. Boundary effects should be considered in the three-dimensional tunnel model calculations, in which the influence range of the model boundary effect is nearly 1.5 times the tunnel span. The results imply that the virtual supporting force generated by the support constraint effect should be considered in two-dimensional rock tunnel model calculations, and that the supporting force of the support should be increased by 2–3% of the maximum supporting force. Rupturable support models are developed using FLAC 3D to intuitively show the numerical calculation results of tunnels. In this paper, we address the support constraint effect of tunnels and analyze the influence of related factors based on the confinement convergence method. The application of a reasonable numerical calculation method is the key to accurately analyzing tunnel rock-support interactions.
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