Abstract
The surrounding rock stress release rate in a two-dimensional (2D) rock tunnel model and boundary problems in a three-dimensional (3D) rock tunnel model are the main factors that affect the results of modeling rock tunnels. We investigated the constraint effect of supporting structures and boundary effects of the 3D model based on the confinement convergence method. A rupturable lining unit was developed using FLAC3D to study the influence of the constraint effect on the surrounding rock stress release and influence range of the boundary effects. The results show that the 2D model stress release enhances the virtual support force generated by the support constraint effect by 3–5% of the initial rock stress. A comparison of field monitoring and numerical calculations of the Millin tunnel project shows that the 3D model boundary effect is nearly 1.5 times the tunnel span. The rupturable lining unit directly reflects the stress characteristics of concrete lining in practical engineering and provides support for the quantitative evaluation of tunnel engineering stability.
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