Research on the law of multiple mining in close coal seams and the roadway support of lower coal seams

Research on the law of multiple mining in close coal seams and the roadway support of lower 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 Article Research on the law of multiple mining in close coal seams and the roadway support of lower coal seams Xiaoyu Wu, Lei Guo, Yaohui Sun, Xiaowei Wu, Nan Zhang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7507267/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 27 Oct, 2025 Read the published version in Scientific Reports → Version 1 posted 8 You are reading this latest preprint version Abstract After multiple mining of the upper and lower coal seams in the near vicinity, the formation of multi-layer coal pillars and multi-layer goafs will affect the roadway layout of the coal seam under pre-mining. Taking the 11103 working face of Fenxi Mine as the engineering background, the evolution law of multiple mining deviators in four stages, including the goaf on one side of the coal pillar in the upper coal seam, the double goaf on the side of the coal pillar in the upper and lower coal seams, the double goaf on the side of the coal pillar in the upper coal seam, the goaf on the side of the lower coal seam, and the double goaf on both sides of the coal pillar in the upper and lower coal seams, and the deformation and failure mechanism of the surrounding rock in the lower coal roadway were analyzed by numerical simulation, and the reasonable layout position of the lower coal roadway was obtained.The results show that: (1) The main reasons for the failure of the surrounding rock of the lower coal roadway are the changes in the concentration, propagation range and disturbance characteristics of the deviatorial stress of the surrounding rock of the multi-layer coal pillar and the goaf floor during multiple mining. (2) The deviator stress characterization of pure shear failure is analyzed theoretically. In the two stages of goaf on one side of the upper coal seam pillar and double goaf on the side of the upper and lower coal seam pillars, the peak deviator stress zone propagates to the deep part of the floor in a similar "arc slip line" and "half-crescent arc slip line". In the two stages of double goaf on one side of the coal pillar in the upper coal seam, double goaf on the side of the lower coal seam, and double goaf on both sides of the coal pillar in the upper and lower coal seams, the peak deviator stress zone is concentrated in floor of the coal pillar, showing a failure form similar to "flat ellipse and circular ellipse". (3) In order to obtain the relative stability area of the roadway, among the influencing factors, with the increase of horizontal dislocation, the peak value of the deviator stress of the surrounding rock of the roadway decreases, and the reduction range of the deviator stress of the surrounding rock of the roadway is ranked as follows: the coal pillar > the floor > the solid coal > the roof, and with the increase of the vertical dislocation, the reduction range of the deviator stress of the surrounding rock of the roadway is ranked as: the solid coal > the roof > the coal pillar > the floor, and the reasonable suggestions for the optimal layout of the roadway are provided in combination with the engineering practice, which provides reference and reference for similar engineering conditions. Physical sciences/Energy science and technology Physical sciences/Engineering Earth and environmental sciences/Solid earth sciences Close coal seams Multiple mining Deviatoric stress field Lower coal roadway Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 27 Oct, 2025 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Accepted 22 Sep, 2025 Reviews received at journal 16 Sep, 2025 Reviews received at journal 16 Sep, 2025 Reviewers agreed at journal 15 Sep, 2025 Reviewers agreed at journal 15 Sep, 2025 Reviewers invited by journal 14 Sep, 2025 Submission checks completed at journal 14 Sep, 2025 First submitted to journal 14 Sep, 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. 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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-7507267","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":514865316,"identity":"adea0d01-2953-4895-9717-55bb0ebac649","order_by":0,"name":"Xiaoyu Wu","email":"","orcid":"","institution":"Shanxi Datong University","correspondingAuthor":false,"prefix":"","firstName":"Xiaoyu","middleName":"","lastName":"Wu","suffix":""},{"id":514865317,"identity":"c3aaea19-2133-4863-ba0f-34d5c789fe02","order_by":1,"name":"Lei Guo","email":"","orcid":"","institution":"Shanxi Datong University","correspondingAuthor":false,"prefix":"","firstName":"Lei","middleName":"","lastName":"Guo","suffix":""},{"id":514865318,"identity":"ce56c8aa-22ba-457b-902c-eb26d5a4c9fe","order_by":2,"name":"Yaohui Sun","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA8UlEQVRIiWNgGAWjYHAC5sc//7HV97O3H3zwwcDGjhgtbMYMbHyMM3vOJBvOKEhLJsoaaQY2OcYNNxLMhHk+HGJsIKRcfkbuAeMCHjNmgxsJacw2BgeYGdgPH92AT4vBjbyExzMk0tgkzzw89jjH4A4fA09a2g28WiRyDAx4DI7x8B1PSDfOMXjGzCDBY4ZXi/yMHAMJnoT/EgwHEsykLQwOMzYQ0sJwI8dAmucAm4HACaAWBmK0GJx5Y2Y4s4EtQRIUyD0GaclshPwi355j/OAjUAs/KCp//LGx42c/fAy/wzAAG2nKR8EoGAWjYBRgAwBv0kxsMJc4DgAAAABJRU5ErkJggg==","orcid":"","institution":"Lyuliang University","correspondingAuthor":true,"prefix":"","firstName":"Yaohui","middleName":"","lastName":"Sun","suffix":""},{"id":514865319,"identity":"5001b00f-ec39-44e2-8068-a89819ddeeb8","order_by":3,"name":"Xiaowei Wu","email":"","orcid":"","institution":"Yongdingzhuang Mine, DaTong Coal Mine Group","correspondingAuthor":false,"prefix":"","firstName":"Xiaowei","middleName":"","lastName":"Wu","suffix":""},{"id":514865320,"identity":"3ef66b13-8289-4c3e-8811-23fb08808e8f","order_by":4,"name":"Nan Zhang","email":"","orcid":"","institution":"Shanxi Datong University","correspondingAuthor":false,"prefix":"","firstName":"Nan","middleName":"","lastName":"Zhang","suffix":""}],"badges":[],"createdAt":"2025-09-01 10:23:26","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-7507267/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-7507267/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1038/s41598-025-21618-x","type":"published","date":"2025-10-27T15:57:40+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":95039971,"identity":"60a831ee-1ed5-48e3-9a8d-afc7842afa86","added_by":"auto","created_at":"2025-11-03 16:06:44","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":3491322,"visible":true,"origin":"","legend":"","description":"","filename":"Researchonthelawofmultiplemining.pdf","url":"https://assets-eu.researchsquare.com/files/rs-7507267/v1_covered_d5a1db5b-400a-4fc8-9260-05f8039e13bb.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Research on the law of multiple mining in close coal seams and the roadway support of lower coal seams","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Close coal seams, Multiple mining, Deviatoric stress field, Lower coal roadway","lastPublishedDoi":"10.21203/rs.3.rs-7507267/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7507267/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eAfter multiple mining of the upper and lower coal seams in the near vicinity, the formation of multi-layer coal pillars and multi-layer goafs will affect the roadway layout of the coal seam under pre-mining. Taking the 11103 working face of Fenxi Mine as the engineering background, the evolution law of multiple mining deviators in four stages, including the goaf on one side of the coal pillar in the upper coal seam, the double goaf on the side of the coal pillar in the upper and lower coal seams, the double goaf on the side of the coal pillar in the upper coal seam, the goaf on the side of the lower coal seam, and the double goaf on both sides of the coal pillar in the upper and lower coal seams, and the deformation and failure mechanism of the surrounding rock in the lower coal roadway were analyzed by numerical simulation, and the reasonable layout position of the lower coal roadway was obtained.The results show that: (1) The main reasons for the failure of the surrounding rock of the lower coal roadway are the changes in the concentration, propagation range and disturbance characteristics of the deviatorial stress of the surrounding rock of the multi-layer coal pillar and the goaf floor during multiple mining. (2) The deviator stress characterization of pure shear failure is analyzed theoretically. In the two stages of goaf on one side of the upper coal seam pillar and double goaf on the side of the upper and lower coal seam pillars, the peak deviator stress zone propagates to the deep part of the floor in a similar \"arc slip line\" and \"half-crescent arc slip line\". In the two stages of double goaf on one side of the coal pillar in the upper coal seam, double goaf on the side of the lower coal seam, and double goaf on both sides of the coal pillar in the upper and lower coal seams, the peak deviator stress zone is concentrated in floor of the coal pillar, showing a failure form similar to \"flat ellipse and circular ellipse\". (3) In order to obtain the relative stability area of the roadway, among the influencing factors, with the increase of horizontal dislocation, the peak value of the deviator stress of the surrounding rock of the roadway decreases, and the reduction range of the deviator stress of the surrounding rock of the roadway is ranked as follows: the coal pillar\u0026thinsp;\u0026gt;\u0026thinsp;the floor\u0026thinsp;\u0026gt;\u0026thinsp;the solid coal\u0026thinsp;\u0026gt;\u0026thinsp;the roof, and with the increase of the vertical dislocation, the reduction range of the deviator stress of the surrounding rock of the roadway is ranked as: the solid coal\u0026thinsp;\u0026gt;\u0026thinsp;the roof\u0026thinsp;\u0026gt;\u0026thinsp;the coal pillar\u0026thinsp;\u0026gt;\u0026thinsp;the floor, and the reasonable suggestions for the optimal layout of the roadway are provided in combination with the engineering practice, which provides reference and reference for similar engineering conditions.\u003c/p\u003e","manuscriptTitle":"Research on the law of multiple mining in close coal seams and the roadway support of lower coal seams","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-09-15 15:25:56","doi":"10.21203/rs.3.rs-7507267/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Accepted","date":"2025-09-22T16:41:42+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-09-16T13:37:09+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-09-16T11:14:24+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"36330734839641251979205435690229995427","date":"2025-09-15T04:02:48+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"245118325587264775549644351444412603075","date":"2025-09-15T04:01:47+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2025-09-15T03:59:02+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2025-09-15T03:10:07+00:00","index":"","fulltext":""},{"type":"submitted","content":"Scientific Reports","date":"2025-09-14T16:21:04+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"b397a179-3d50-4c6f-aaae-a8e4697391ad","owner":[],"postedDate":"September 15th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":54688817,"name":"Physical sciences/Energy science and technology"},{"id":54688818,"name":"Physical sciences/Engineering"},{"id":54688819,"name":"Earth and environmental sciences/Solid earth sciences"}],"tags":[],"updatedAt":"2025-11-03T16:01:06+00:00","versionOfRecord":{"articleIdentity":"rs-7507267","link":"https://doi.org/10.1038/s41598-025-21618-x","journal":{"identity":"scientific-reports","isVorOnly":false,"title":"Scientific Reports"},"publishedOn":"2025-10-27 15:57:40","publishedOnDateReadable":"October 27th, 2025"},"versionCreatedAt":"2025-09-15 15:25:56","video":"","vorDoi":"10.1038/s41598-025-21618-x","vorDoiUrl":"https://doi.org/10.1038/s41598-025-21618-x","workflowStages":[]},"version":"v1","identity":"rs-7507267","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7507267","identity":"rs-7507267","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}