Evaluation criteria and dehydration method for EPB shield spoil in sandy gravel– mudstone composite stratum

Evaluation criteria and dehydration method for EPB shield spoil in sandy gravel– mudstone composite stratum | 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 Research Article Evaluation criteria and dehydration method for EPB shield spoil in sandy gravel– mudstone composite stratum Dongping Zhao, Feng Wang, Yuelei Peng, Weichao Tang, Li Xiao, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4931833/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Shield tunnels in composite strata of mudstone and pebble produce a large amount of high-water-content spoil during excavation using earth pressure balance machines. This spoil not only has high transportation costs but also poses environmental pollution. We evaluated the moisture content, liquid and plastic limits of the moisture content, and permeability coefficient of the shield slag in the shield tunnel project of the first phase of the Chengdu Metro Line 30. Shield spoil dehydration tests were performed in gravel–mudstone composite strata, and a spoil dehydration evaluation method using slump and fluidity as the indicators was proposed. The results of the self-weight dehydration test showed that the moisture content of the spoil was reduced by approximately 7% after 24 h and the dehydration effect on the spoil was poor. The results of a vacuum–electroosmotic dehydration orthogonal test showed that by controlling parameters such as voltage and electrode spacing, the moisture content of the spoil can be reduced to a value close to the liquid-limit moisture content. The fluidity and slump of the spoil after dehydration meet the requisite standards, indicating the potential for market application of this method. Mudstone Sandy gravel soil Composite strata Shield spoil Dehydration test Evaluation criteria Full Text Additional Declarations Table 1 to 7 are available in the Supplementary Files section. Supplementary Files Table1.docx Table2.docx Table3.docx Table4.docx Table5.docx Table6.docx Table7.docx Cite Share Download PDF Status: Posted Version 1 posted 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. We do this by developing innovative software and high quality services for the global research community. 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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-4931833","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":345634104,"identity":"0c2746ec-6060-4081-b614-086a4b700a98","order_by":0,"name":"Dongping 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