Study on mechanical response and fracture characteristics of rock under full path unloading

Study on mechanical response and fracture characteristics of rock under full path unloading | 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 Study on mechanical response and fracture characteristics of rock under full path unloading Gang Liu, Dongwei Wang, Yingming Li, Fukun Xiao This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3432568/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 When the underground roadway of the coal mine passes through the abnormal area of geological structure (fault, collapse column, fracture zone, etc.), the excavation induces the unloading instability of engineering rock mass. The rock mass in the fracture zone is in elastic, plastic, and post-peak stress states. The process of excavation through the fracture zone is essentially unloading from the full stress path. To explore the mechanical response to sandstone under different stress levels, based on the study of the possibility of stress path, the elastic axial pressure unloading confining pressure, the elastic principal stress constant unloading confining pressure, the plastic axial pressure unloading confining pressure, the plastic principal stress constant unloading confining pressure, the plastic axial D1 displacement constant unloading confining pressure, the plastic axial pressure confining pressure proportional unloading, and the post-peak axial pressure confining pressure synchronous unloading path are systematically carried out. The characteristics of a full stress-strain curve under 7 unloading paths are obtained, the deformation law caused by unloading is analyzed, and the relationship between the unloading path and strain increment is studied. It is obtained that with the increase of unloading degree, the unloading deformation modulus E in the elastic stress state first increases, then stabilizes, and then decreases, and the unloading deformation modulus E in the plastic stress state gradually decreases, Poisson's ratio µ both showed an increasing trend, normalized plastic shear strain \({\gamma ^p}/\gamma _{{\hbox{max} }}^{p}\) and dilatancy angle ψ according to the single exponential function, the initial confining pressure is negatively correlated with the dilatancy angle, and the research results can support the enrichment and development of unloading rock mechanics. geological anomaly area full path unloading mechanical response capacity expansion characteristics unloading degree Full Text Additional Declarations No competing interests reported. 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. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-3432568","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":240568005,"identity":"f6a48a9b-1d58-4baa-a958-8e28f352384c","order_by":0,"name":"Gang Liu","email":"","orcid":"","institution":"Heilongjiang University of Science and Technology","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Gang","middleName":"","lastName":"Liu","suffix":""},{"id":240568008,"identity":"3ad7825d-47c2-4797-a81b-e3af79a93442","order_by":1,"name":"Dongwei Wang","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAzklEQVRIiWNgGAWjYBACNv7mgw8/VEjUs7E3HyBOC5/EsWRjiTM2Cfw8xxKI0yLHkGMmwduSliA5I8eASIcxHDCTkGw4nGdwIOfjjTcMdnK6DYS0MDckWxTuOFxscODsZss5DMnGZgcI23LwhuSZw4wbDvZuk+ZhOJC4jbCWxAYJ3jaglsM8z4jVkswE1JKWOLONh41ILRLHmEGBbMzPw2ZsOceACL/I9/d/BEWlHJv844c33lTYyRHUggIkeIiMGmQtpOoYBaNgFIyCEQEAbsNEQrgIk1oAAAAASUVORK5CYII=","orcid":"","institution":"Heilongjiang University of Science and Technology","correspondingAuthor":true,"submittingAuthor":false,"prefix":"","firstName":"Dongwei","middleName":"","lastName":"Wang","suffix":""},{"id":240568010,"identity":"25cc1350-b1fa-48f1-ae4c-d23a2a68d0de","order_by":2,"name":"Yingming Li","email":"","orcid":"","institution":"Anhui University of Science and Technology","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Yingming","middleName":"","lastName":"Li","suffix":""},{"id":240568011,"identity":"46cae1a1-d534-4cf2-b764-3e12d092bd5c","order_by":3,"name":"Fukun Xiao","email":"","orcid":"","institution":"Heilongjiang University of Science and Technology","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Fukun","middleName":"","lastName":"Xiao","suffix":""}],"badges":[],"createdAt":"2023-10-11 12:59:26","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-3432568/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-3432568/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":44882605,"identity":"d3fdbf00-7b9f-492c-995d-7dc90c47d078","added_by":"auto","created_at":"2023-10-18 22:12:30","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":620983,"visible":true,"origin":"","legend":"","description":"","filename":"Studyonmechanicalresponseandfracturecharacteristicsofrockunderfullpathunloading.pdf","url":"https://assets-eu.researchsquare.com/files/rs-3432568/v1_covered_8ddc1292-4518-4149-afc1-7039707500eb.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Study on mechanical response and fracture characteristics of rock under full path unloading","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"geological anomaly area, full path unloading, mechanical response, capacity expansion characteristics, unloading degree","lastPublishedDoi":"10.21203/rs.3.rs-3432568/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-3432568/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eWhen the underground roadway of the coal mine passes through the abnormal area of geological structure (fault, collapse column, fracture zone, etc.), the excavation induces the unloading instability of engineering rock mass. The rock mass in the fracture zone is in elastic, plastic, and post-peak stress states. The process of excavation through the fracture zone is essentially unloading from the full stress path. To explore the mechanical response to sandstone under different stress levels, based on the study of the possibility of stress path, the elastic axial pressure unloading confining pressure, the elastic principal stress constant unloading confining pressure, the plastic axial pressure unloading confining pressure, the plastic principal stress constant unloading confining pressure, the plastic axial D1 displacement constant unloading confining pressure, the plastic axial pressure confining pressure proportional unloading, and the post-peak axial pressure confining pressure synchronous unloading path are systematically carried out. The characteristics of a full stress-strain curve under 7 unloading paths are obtained, the deformation law caused by unloading is analyzed, and the relationship between the unloading path and strain increment is studied. It is obtained that with the increase of unloading degree, the unloading deformation modulus E in the elastic stress state first increases, then stabilizes, and then decreases, and the unloading deformation modulus E in the plastic stress state gradually decreases, Poisson's ratio \u0026micro; both showed an increasing trend, normalized plastic shear strain \u003cspan class=\"InlineEquation\"\u003e\u003cspan class=\"mathinline\"\u003e\\({\\gamma ^p}/\\gamma _{{\\hbox{max} }}^{p}\\)\u003c/span\u003e\u003c/span\u003e and dilatancy angle ψ according to the single exponential function, the initial confining pressure is negatively correlated with the dilatancy angle, and the research results can support the enrichment and development of unloading rock mechanics.\u003c/p\u003e","manuscriptTitle":"Study on mechanical response and fracture characteristics of rock under full path unloading","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2023-10-18 21:48:13","doi":"10.21203/rs.3.rs-3432568/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"9c5c53ac-6154-48da-a4e9-0ab83816961c","owner":[],"postedDate":"October 18th, 2023","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2023-10-18T21:48:16+00:00","versionOfRecord":[],"versionCreatedAt":"2023-10-18 21:48:13","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-3432568","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-3432568","identity":"rs-3432568","version":["v1"]},"buildId":"rHA-KDH7Qsr4HCuvH75dn","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}