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      Investigating the influence of excavating a tunnel undercrossing an existing tunnel at zero distance

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          Abstract

          In urban areas with limited underground space, the new tunnel construction introduces additional loads and displacements to existing tunnels, raising serious safety concerns. These concerns become particularly pronounced in the case of closely undercrossing excavation at zero-distance. The conventional elastic foundation beam model, which assumes constant reaction coefficients for the subgrade, fails to account for foundation loss. In this study, the existing tunnel is modeled as an Euler-Bernoulli beam supported by the Pasternak elastic foundation, and the foundation loss caused by zero-distance undercrossing excavations is considered. Furthermore, an analytical solution is proposed to evaluate the mechanical response in segments, by establishing governing differential equations and boundary conditions for the excavation and neutral zones, and underpinning loads are also considered. The analytical solution is validated in two case studies. Finally, a parametric analysis is performed to explore the influence of various parameters on the mechanical response of the existing tunnel.

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          Most cited references35

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          Geotechnical influence on existing subway tunnels induced by multiline tunneling in Shanghai soft soil

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            Behaviour of an old masonry tunnel due to tunnelling-induced ground settlement

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              Effects of twin tunnels construction beneath existing shield-driven twin tunnels

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                Author and article information

                Contributors
                Role: MethodologyRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: Funding acquisitionRole: Resources
                Role: Funding acquisitionRole: SupervisionRole: Writing – review & editing
                Role: Investigation
                Role: Data curation
                Role: Writing – review & editing
                Role: Formal analysisRole: Writing – review & editing
                Role: Writing – review & editing
                Role: Editor
                Journal
                PLoS One
                PLoS One
                plos
                PLOS ONE
                Public Library of Science (San Francisco, CA USA )
                1932-6203
                16 April 2024
                2024
                : 19
                : 4
                : e0301428
                Affiliations
                [1 ] School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, China
                [2 ] State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, China
                [3 ] China Railway Construction Corporation Limited, Beijing, China
                [4 ] Shandong Hi-Speed Construction Management Group Co., Ltd., Jinan, China
                [5 ] Shandong Hi-Speed Group Co., Ltd., Jinan, China
                Faculty of Engineering, University of Rijeka, CROATIA
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Author information
                https://orcid.org/0000-0002-2183-8895
                Article
                PONE-D-23-43535
                10.1371/journal.pone.0301428
                11020911
                38625862
                aa707eff-8d16-459a-870b-40e23736b7ef
                © 2024 Xu et al

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 25 December 2023
                : 15 March 2024
                Page count
                Figures: 21, Tables: 2, Pages: 28
                Funding
                Funded by: funder-id http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;
                Award ID: 52178391
                Award Recipient :
                Funded by: National Key R&D Program of China
                Award ID: 2018YFC0808700
                Award Recipient :
                This study was supported by the National Natural Science Founda tion of China (52178391) and the National Key R&D Program of China (2018YFC0808700). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
                Categories
                Research Article
                Physical Sciences
                Physics
                Classical Mechanics
                Deformation
                Bending
                Physical Sciences
                Physics
                Classical Mechanics
                Damage Mechanics
                Deformation
                Bending
                Physical Sciences
                Materials Science
                Material Properties
                Mechanical Properties
                Stiffness
                Research and Analysis Methods
                Simulation and Modeling
                Research and Analysis Methods
                Mathematical and Statistical Techniques
                Statistical Methods
                Parametric Analysis
                Physical Sciences
                Mathematics
                Statistics
                Statistical Methods
                Parametric Analysis
                Physical Sciences
                Mathematics
                Differential Equations
                Engineering and Technology
                Structural Engineering
                Built Structures
                Earth Sciences
                Geography
                Human Geography
                Urban Geography
                Urban Areas
                Social Sciences
                Human Geography
                Urban Geography
                Urban Areas
                Earth Sciences
                Geography
                Geographic Areas
                Urban Areas
                Physical Sciences
                Mathematics
                Geometry
                Surface Theory
                Custom metadata
                All relevant data are within the paper and Supporting information files.

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