FDEM simulation study on the development of water-conducting fractures in fault-bearing roof under repeated mining of extra-thick coal seams

FDEM simulation study on the development of water-conducting fractures in fault-bearing roof under repeated mining of extra-thick coal seams | 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 FDEM simulation study on the development of water-conducting fractures in fault-bearing roof under repeated mining of extra-thick coal seams Mai Longquan, Li Hao, Kang Zhiqin This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4265450/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 The formation of water-conducting fractures in overlying strata caused by underground coal mining not only leads to roof water inrush disasters, but also destroys the sustainability of underground aquifers. This phenomenon is particularly significant in extra-thick coal seams and fault-bearing areas. Numerical simulation is an effective method to predict the failure range of mining overburden rock with low cost and high efficiency. The key to its accuracy lies in reasonable constitutive model and simulation program. In this study, considering that the three parts of penetrating cracks, non-penetrating cracks and intact rock blocks are often formed after rock failure, the contact state criterion and shear friction relationship of discrete rock blocks and the mixed fracture displacement-damage-load relationship are established respectively. Combined with Mohr-Coulomb criterion, the constitutive model of mining rock mass deformation-discrete block motion and interaction is formed. On this basis, according to the engineering geological conditions of Yushupo Coal Mine, a numerical model for the development of water-conducting cracks in the roof with faults under repeated mining of extra-thick coal seams is established. The results show that: The constitutive relation of continuous deformation-discrete block interaction of overlying strata and the corresponding finite element-discrete element FDEM numerical program and VUSDFLD multi-coal seam continuous mining subroutine can numerically realize the formation process of faults and water flowing fractures in overlying strata under continuous mining of extra-thick multi-coal seams. The toughness of sand mudstone is low, and the fracture will be further developed under the repeated disturbance of multi-thick coal seam mining. Finally, it is stabilized at 216m-226m, and the ratio of fracture height to mining thickness is 14.1. When the working face advances to the fault, the stress concentration occurs in the fault and its overlying rock, which leads to the local fracture of the roof rock mass and the formation of cracks. The fault group makes this phenomenon more obvious. The results have been preliminarily applied and tested in Ningwu mining area, which provides theoretical support for further development of roof water disaster control under the condition of extra-thick coal seam. extra-thick coal seams faults finite–discrete element method water-conducting fractures constitutive model 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. 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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-4265450","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":291485948,"identity":"9f37e590-2799-4904-bad3-3374149ef32d","order_by":0,"name":"Mai Longquan","email":"","orcid":"","institution":"Taiyuan University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Mai","middleName":"","lastName":"Longquan","suffix":""},{"id":291485949,"identity":"afa962f5-220c-4ae7-92ae-dad557ae5caa","order_by":1,"name":"Li Hao","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAvklEQVRIiWNgGAWjYBACAwYGxgMJIBZ7Y+PDD0RqYTiQANTDw3O42ViCaC0MIC0S6W0CPMRoMWc/fODAwx+HE/dLPmxjkGCwk9NtIKDFsictAeiww4k90oltDwoYko3NDhBy2IEcA5iWdgMJhgOJ2whqOf8GqkXyYJsED1FabsBskWAkWsszoF/S0o17ziQCA9mAGL+cTz748IeNtWx7+/GHDz9U2MkR1AIFzTATiFMOAnXEKx0Fo2AUjIKRBwCzTkpup8befwAAAABJRU5ErkJggg==","orcid":"","institution":"Taiyuan University of Technology","correspondingAuthor":true,"prefix":"","firstName":"Li","middleName":"","lastName":"Hao","suffix":""},{"id":291485950,"identity":"c9cfc37b-c902-4852-a844-66072951f031","order_by":2,"name":"Kang Zhiqin","email":"","orcid":"","institution":"Taiyuan University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Kang","middleName":"","lastName":"Zhiqin","suffix":""}],"badges":[],"createdAt":"2024-04-14 14:59:23","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-4265450/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-4265450/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":56793736,"identity":"0089f635-7df8-4e11-ae27-b898ecb5727f","added_by":"auto","created_at":"2024-05-20 14:19:56","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":4059192,"visible":true,"origin":"","legend":"","description":"","filename":"englishedited2448.pdf","url":"https://assets-eu.researchsquare.com/files/rs-4265450/v1_covered_bdef0316-ec28-4055-b37f-870c878d8845.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"FDEM simulation study on the development of water-conducting fractures in fault-bearing roof under repeated mining of extra-thick coal seams","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":"extra-thick coal seams, faults, finite–discrete element method, water-conducting fractures, constitutive model","lastPublishedDoi":"10.21203/rs.3.rs-4265450/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4265450/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe formation of water-conducting fractures in overlying strata caused by underground coal mining not only leads to roof water inrush disasters, but also destroys the sustainability of underground aquifers. This phenomenon is particularly significant in extra-thick coal seams and fault-bearing areas. Numerical simulation is an effective method to predict the failure range of mining overburden rock with low cost and high efficiency. The key to its accuracy lies in reasonable constitutive model and simulation program. In this study, considering that the three parts of penetrating cracks, non-penetrating cracks and intact rock blocks are often formed after rock failure, the contact state criterion and shear friction relationship of discrete rock blocks and the mixed fracture displacement-damage-load relationship are established respectively. Combined with Mohr-Coulomb criterion, the constitutive model of mining rock mass deformation-discrete block motion and interaction is formed. On this basis, according to the engineering geological conditions of Yushupo Coal Mine, a numerical model for the development of water-conducting cracks in the roof with faults under repeated mining of extra-thick coal seams is established. The results show that: The constitutive relation of continuous deformation-discrete block interaction of overlying strata and the corresponding finite element-discrete element FDEM numerical program and VUSDFLD multi-coal seam continuous mining subroutine can numerically realize the formation process of faults and water flowing fractures in overlying strata under continuous mining of extra-thick multi-coal seams. The toughness of sand mudstone is low, and the fracture will be further developed under the repeated disturbance of multi-thick coal seam mining. Finally, it is stabilized at 216m-226m, and the ratio of fracture height to mining thickness is 14.1. When the working face advances to the fault, the stress concentration occurs in the fault and its overlying rock, which leads to the local fracture of the roof rock mass and the formation of cracks. The fault group makes this phenomenon more obvious. The results have been preliminarily applied and tested in Ningwu mining area, which provides theoretical support for further development of roof water disaster control under the condition of extra-thick coal seam.\u003c/p\u003e","manuscriptTitle":"FDEM simulation study on the development of water-conducting fractures in fault-bearing roof under repeated mining of extra-thick coal seams","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-04-18 10:29:19","doi":"10.21203/rs.3.rs-4265450/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":"d634b053-4baa-409c-81dd-da97b0e5c32a","owner":[],"postedDate":"April 18th, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2024-05-20T14:11:46+00:00","versionOfRecord":[],"versionCreatedAt":"2024-04-18 10:29:19","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-4265450","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-4265450","identity":"rs-4265450","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}