Study on the construction method for in-situ expansion of existing large cross-section tunnels

Study on the construction method for in-situ expansion of existing large cross-section tunnels | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Case Report Study on the construction method for in-situ expansion of existing large cross-section tunnels Han Dayong, Zhong Xingwu, Liu Lei, Cui Hao, Li Dong, Yan Zihai, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5446124/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 9 You are reading this latest preprint version Abstract This paper takes the in-situ expansion project of the Dachangshan tunnel as a case study to compare and optimize the construction method for the in-situ expansion of existing large cross-section tunnels. The deformation of the tunnel, the stress distribution of the surrounding rock, and the force on the tunnel support under three different construction schemes are examined in the paper. The results indicate that the "from top to bottom" construction scheme is superior to the "from left to right" scheme in terms of managing deformation and minimizing the demolition risk of the existing secondary lining. Moreover, the "from sidewall to inverted arch" construction scheme is more effective in controlling the deformation of the surrounding rock and reducing the stress on the initial support of the new tunnel. In particular, the risk of the secondary lining demolition has been evaluated, and it was reduced by adding steel pipe brace support. Finally, the field monitoring results verify the accuracy of the numerical calculation results and the safety of the optimal construction scheme. In-situ tunnel expansion large cross-section tunnels tunnel lining demolition Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 21 Apr, 2025 Reviews received at journal 15 Apr, 2025 Reviews received at journal 14 Apr, 2025 Reviewers agreed at journal 14 Apr, 2025 Reviewers agreed at journal 14 Apr, 2025 Reviewers invited by journal 14 Apr, 2025 Editor assigned by journal 14 Apr, 2025 Submission checks completed at journal 11 Apr, 2025 First submitted to journal 31 Mar, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5446124","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Case Report","associatedPublications":[],"authors":[{"id":442922798,"identity":"5b58873b-551c-4c6e-97eb-329124366d1f","order_by":0,"name":"Han Dayong","email":"","orcid":"","institution":"PowerChina RoadBridge Group Corporation Limited","correspondingAuthor":false,"prefix":"","firstName":"Han","middleName":"","lastName":"Dayong","suffix":""},{"id":442922799,"identity":"75dca7c4-38ca-4e35-9a78-a6fb6f2b885c","order_by":1,"name":"Zhong Xingwu","email":"","orcid":"","institution":"PowerChina RoadBridge Group Corporation 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