A Study on the Optimal Location for Offset Arrangement of Back- mining Drifts Below a 60-meter-wide Coal Pillar in the Upper Substratum of a Thick Coal Seam

A Study on the Optimal Location for Offset Arrangement of Back- mining Drifts Below a 60-meter-wide Coal Pillar in the Upper Substratum of a Thick Coal Seam | 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 A Study on the Optimal Location for Offset Arrangement of Back- mining Drifts Below a 60-meter-wide Coal Pillar in the Upper Substratum of a Thick Coal Seam Xiaoxiang Chen, Yucheng Liu This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9188670/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 12 You are reading this latest preprint version Abstract In order to improve the recovery rate of coal resources and address the issue of reasonably positioning staggered mining roadways under thick coal seams, the transportation gallery of working face 52202 in Wulan Setai Coal Mine was taken as the research object. The strength of wide coal pillars in the upper layered section and the loads they bear were calculated and analyzed, resulting in a coal pillar strength of 30.30 MPa, which is greater than the 6.68 MPa load affected by the goaf. Using the limit equilibrium theory, the limit equilibrium zone width of the wide coal pillars in the upper layered section was calculated to be 13.08 m, with the elastic zone located 13.08–39.52 m from the right edge of the coal pillar. Simulate the characteristics of stress and displacement field changes in the surrounding rock when the roadway for layered retreat mining is arranged with different staggered distances using the finite difference numerical simulation software FLAC3D.The results indicate that when the thick coal seam is mined in layers at a staggered distance of 24 meters, the stress on the surrounding rock of the mining roadway tends to be relatively uniform, the deformation is relatively minimal, and the roadway is the easiest to maintain. The proposed design was applied to the 52202 mining roadway in the Wulan Setai Coal Mine. Field practice demonstrates that an externally staggered distance of 24 m for the lower layering mining roadway meets the requirements for safe and efficient production, providing a valuable reference for coal mines under similar geological conditions. Physical sciences/Energy science and technology Physical sciences/Engineering Earth and environmental sciences/Solid earth sciences Layered mining of thick coal seams Wide coal pillar Mining roadway externally staggered layout Limit equilibrium zone Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 09 Apr, 2026 Reviews received at journal 03 Apr, 2026 Reviewers agreed at journal 03 Apr, 2026 Reviews received at journal 31 Mar, 2026 Reviewers agreed at journal 31 Mar, 2026 Reviewers agreed at journal 30 Mar, 2026 Reviewers agreed at journal 28 Mar, 2026 Reviewers invited by journal 26 Mar, 2026 Editor invited by journal 26 Mar, 2026 Editor assigned by journal 23 Mar, 2026 Submission checks completed at journal 23 Mar, 2026 First submitted to journal 21 Mar, 2026 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-9188670","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":613092197,"identity":"a9305c78-7b1d-43f9-8462-27dc7b395bdc","order_by":0,"name":"Xiaoxiang Chen","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAzklEQVRIiWNgGAWjYDACCTjJfODAhx+kaWFLPDizh3gtIMBjfJiDjQgd/LObjz3mbbOQN+df8+EwAw+DPL/YAQKW3DmWbjjjjIThzhlvNxwusGAwnDk7Ab8WA4kcM4kPFRKMG26c3XB4Bg9DgsFtglryv0kkGEjYb7hx5sFhHjaitOSwgWxJ3HC+h4E4LRI30swkgX5J3nCDzQAYyBKE/cI/I/mZNG9bne2G84cff/jww0aeX5qAFiT7wColCKhCte8AKapHwSgYBaNgJAEAyOFGCiE157gAAAAASUVORK5CYII=","orcid":"","institution":"Henan Polytechnic University","correspondingAuthor":true,"prefix":"","firstName":"Xiaoxiang","middleName":"","lastName":"Chen","suffix":""},{"id":613092198,"identity":"972c56d1-ffd3-4888-9d34-6816f9751256","order_by":1,"name":"Yucheng Liu","email":"","orcid":"","institution":"Henan Polytechnic University","correspondingAuthor":false,"prefix":"","firstName":"Yucheng","middleName":"","lastName":"Liu","suffix":""}],"badges":[],"createdAt":"2026-03-22 02:38:55","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-9188670/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-9188670/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":105729228,"identity":"5780fad0-0728-406d-b28c-2498d9205553","added_by":"auto","created_at":"2026-03-30 11:13:50","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1102116,"visible":true,"origin":"","legend":"","description":"","filename":"AStudyontheOptimalLocationforOffsetArrangementofBackminingDriftsBelowa60meterwideCoalPillarintheUpperSubstratumofaThickCoalSeam.pdf","url":"https://assets-eu.researchsquare.com/files/rs-9188670/v1_covered_b90cd1b5-0ddc-478e-b5a3-12bd853a0701.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"A Study on the Optimal Location for Offset Arrangement of Back- mining Drifts Below a 60-meter-wide Coal Pillar in the Upper Substratum of a Thick Coal Seam","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":"Layered mining of thick coal seams, Wide coal pillar, Mining roadway, externally staggered layout, Limit equilibrium zone","lastPublishedDoi":"10.21203/rs.3.rs-9188670/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-9188670/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003e \u003cb\u003eIn order to improve the recovery rate of coal resources and address the issue of reasonably positioning staggered mining roadways under thick coal seams, the transportation gallery of working face 52202 in Wulan Setai Coal Mine was taken as the research object. The strength of wide coal pillars in the upper layered section and the loads they bear were calculated and analyzed, resulting in a coal pillar strength of 30.30 MPa, which is greater than the 6.68 MPa load affected by the goaf. Using the limit equilibrium theory, the limit equilibrium zone width of the wide coal pillars in the upper layered section was calculated to be 13.08 m, with the elastic zone located 13.08\u0026ndash;39.52 m from the right edge of the coal pillar. Simulate the characteristics of stress and displacement field changes in the surrounding rock when the roadway for layered retreat mining is arranged with different staggered distances using the finite difference numerical simulation software FLAC3D.The results indicate that when the thick coal seam is mined in layers at a staggered distance of 24 meters, the stress on the surrounding rock of the mining roadway tends to be relatively uniform, the deformation is relatively minimal, and the roadway is the easiest to maintain. The proposed design was applied to the 52202 mining roadway in the Wulan Setai Coal Mine. Field practice demonstrates that an externally staggered distance of 24 m for the lower layering mining roadway meets the requirements for safe and efficient production, providing a valuable reference for coal mines under similar geological conditions.\u003c/b\u003e \u003c/p\u003e","manuscriptTitle":"A Study on the Optimal Location for Offset Arrangement of Back- mining Drifts Below a 60-meter-wide Coal Pillar in the Upper Substratum of a Thick Coal Seam","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-03-30 06:37:00","doi":"10.21203/rs.3.rs-9188670/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2026-04-09T04:16:38+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-04-03T13:11:57+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"167895143315355061188342623667471226537","date":"2026-04-03T09:14:32+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-03-31T14:34:32+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"279450427439766499342029655410687588118","date":"2026-03-31T05:09:12+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"300074998797449481416032468833021151400","date":"2026-03-31T01:01:09+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"294672840844820394523729228219479894434","date":"2026-03-28T11:00:16+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2026-03-26T08:40:45+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2026-03-26T08:04:52+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2026-03-23T11:52:29+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2026-03-23T11:51:58+00:00","index":"","fulltext":""},{"type":"submitted","content":"Scientific Reports","date":"2026-03-22T02:34:30+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":"6369f95c-ff6c-46dd-a665-d8457c5b41cc","owner":[],"postedDate":"March 30th, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[{"id":65236498,"name":"Physical sciences/Energy science and technology"},{"id":65236499,"name":"Physical sciences/Engineering"},{"id":65236500,"name":"Earth and environmental sciences/Solid earth sciences"}],"tags":[],"updatedAt":"2026-04-27T06:26:42+00:00","versionOfRecord":[],"versionCreatedAt":"2026-03-30 06:37:00","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-9188670","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-9188670","identity":"rs-9188670","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}