Abstract
Convergence-confinement method (CCM) has become a common method for tunnel design due to its simplicity and practicality. The ground reaction curve (GRC), the support characteristic curve (SCC) and the longitudinal deformation profile (LDP) are all considered in this method. One of these is the LDP which serves as a unique identifier for the location of the tunnel support. The installation point of the tunnel support is one of the most important outcomes of the method. LDP is more impacted by the reinforcement of the tunnel face. However, more existing LDP calculation methods do not consider the reinforcement of the tunnel face. A study on methods for calculating LDP considering the tunnel face reinforcement was carried out to address this constraint of CCM. Firstly, the transformation of tunnel face extrusion deformation and pre-convergence deformation at the tunnel face is realized in accordance with equivalent volume. Then a model of LDP with the tunnel face extrusion deformation as the variable was established considering the tunnel face reinforcement effect. The proposed model’s accuracy is assessed in comparison with other typical models. We conclude with parametric analyses concerning the tunnel face reinforcement’s effects on the point of support installation, as well as convergence deformation of the tunnel. By taking into account tunnel faces’ reinforcement effects, tunnel support design can be more accurate, and the construction costs can be reduced.
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This work was supported by the Project of China Railway Science and Technology Research and Development Plan (Grant No. P2019G038-5).
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Wang, Z., Wang, M. & Liu, D. Analysis and Modeling of Longitudinal Deformation Profiles Considering the Reinforcement Effect of Tunnel Face in Weak Rocks. KSCE J Civ Eng 26, 5372–5383 (2022). https://doi.org/10.1007/s12205-022-1664-2
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DOI: https://doi.org/10.1007/s12205-022-1664-2