Mechanical properties and microscopic damage characteristics of coal-series limestone under real-time coupling effects of high temperature and impact

Mechanical properties and microscopic damage characteristics of coal-series limestone under real-time coupling effects of high temperature and impact | 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 Mechanical properties and microscopic damage characteristics of coal-series limestone under real-time coupling effects of high temperature and impact peng wu, lianying zhang, bing li, yadong zheng, ming li, fuqiang zhu This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5002876/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 30 Dec, 2024 Read the published version in Scientific Reports → Version 1 posted 13 You are reading this latest preprint version Abstract To ensure the safe extraction of deep mineral resources, it is imperative to address the mechanical properties and damage mechanism of coal and rock media under the real-time coupling effect of high temperature and impact. In this study, the impact tests (impact velocities of 6.0-10.0 m/s) on coal-series limestone under real-time high-temperature conditions (25 ℃-800 ℃) were conducted by the real-time high-temperature split Hopkinson pressure bar (HT-SHPB) testing system, and the microscopic changes in mineral composition under the coupling effect of real-time high-temperature and high strain rate action were investigated by X-ray diffraction (XRD), electron scanning microscopy (SEM), energy dispersive spectroscopy (EDS). The results showed that the dynamic stress-strain curve of coal-series limestone under the real-time coupling effect of high temperature and impact during the compaction stage was not significant; As the impact velocity increases and the temperature increases, the plastic characteristics of the dynamic stress-strain curve become more notable, and the brittle failure of the sample is gradually changed into brittle-ductile failure. Additionally, the dynamic peak stress and dynamic elastic modulus exhibit distinct quadratic variations with the increased temperature, and the dynamic peak stress approximately increases linearly with the impact velocity. The main substances in coal-series limestone are calcite, dolomite, and muscovite. The microscopic morphology of calcite at room temperature is characterized by a thin stepped or layered structure. When the temperature rises to 800 ℃, thermal decomposition rarely occurs in calcite, while its physical and mechanical properties undergo alternations. After real-time impact, the degree of crystal fragmentation of calcite increases and a large number of microcracks are generated. The dolomite exhibits a prismatic microscopic morphology at room temperature, characterized by distinct and flat edges, and typically occurs in clusters. When the temperature rises to 600 ℃, an increased amount of dolomite initiates thermal decomposition, and the crystal edges become passive, even leading to the granulation phenomenon. Consequently, the impact mechanical properties of limestone are ultimately weakened due to the thermal decomposition of mineral components and changes in physical and mechanical properties caused by high temperature. Physical sciences/Energy science and technology/Fossil fuels/Coal Physical sciences/Physics/Statistical physics thermodynamics and nonlinear dynamics/Thermodynamics Earth and environmental sciences/Solid earth sciences/Geodynamics deep mining Real-time high temperature coal-series limestone Dynamics Microscopic damage Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 30 Dec, 2024 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 08 Nov, 2024 Reviews received at journal 06 Nov, 2024 Reviews received at journal 31 Oct, 2024 Reviews received at journal 31 Oct, 2024 Reviewers agreed at journal 26 Oct, 2024 Reviewers agreed at journal 24 Oct, 2024 Reviewers agreed at journal 21 Oct, 2024 Reviewers agreed at journal 21 Oct, 2024 Reviewers invited by journal 21 Oct, 2024 Editor assigned by journal 03 Oct, 2024 Editor invited by journal 10 Sep, 2024 Submission checks completed at journal 10 Sep, 2024 First submitted to journal 30 Aug, 2024 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-5002876","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":375584823,"identity":"c6671661-8bdd-48c1-8170-4e3b8beb19cc","order_by":0,"name":"peng wu","email":"","orcid":"","institution":"Xuzhou University of Technology","correspondingAuthor":false,"prefix":"","firstName":"peng","middleName":"","lastName":"wu","suffix":""},{"id":375584824,"identity":"e864bcb4-ac89-4382-9438-e36126597540","order_by":1,"name":"lianying 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In this study, the impact tests (impact velocities of 6.0-10.0 m/s) on coal-series limestone under real-time high-temperature conditions (25 ℃-800 ℃) were conducted by the real-time high-temperature split Hopkinson pressure bar (HT-SHPB) testing system, and the microscopic changes in mineral composition under the coupling effect of real-time high-temperature and high strain rate action were investigated by X-ray diffraction (XRD), electron scanning microscopy (SEM), energy dispersive spectroscopy (EDS). The results showed that the dynamic stress-strain curve of coal-series limestone under the real-time coupling effect of high temperature and impact during the compaction stage was not significant; As the impact velocity increases and the temperature increases, the plastic characteristics of the dynamic stress-strain curve become more notable, and the brittle failure of the sample is gradually changed into brittle-ductile failure. Additionally, the dynamic peak stress and dynamic elastic modulus exhibit distinct quadratic variations with the increased temperature, and the dynamic peak stress approximately increases linearly with the impact velocity. The main substances in coal-series limestone are calcite, dolomite, and muscovite. The microscopic morphology of calcite at room temperature is characterized by a thin stepped or layered structure. When the temperature rises to 800 ℃, thermal decomposition rarely occurs in calcite, while its physical and mechanical properties undergo alternations. After real-time impact, the degree of crystal fragmentation of calcite increases and a large number of microcracks are generated. The dolomite exhibits a prismatic microscopic morphology at room temperature, characterized by distinct and flat edges, and typically occurs in clusters. When the temperature rises to 600 ℃, an increased amount of dolomite initiates thermal decomposition, and the crystal edges become passive, even leading to the granulation phenomenon. Consequently, the impact mechanical properties of limestone are ultimately weakened due to the thermal decomposition of mineral components and changes in physical and mechanical properties caused by high temperature.\u003c/p\u003e","manuscriptTitle":"Mechanical properties and microscopic damage characteristics of coal-series limestone under real-time coupling effects of high temperature and impact","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-11-28 10:54:23","doi":"10.21203/rs.3.rs-5002876/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2024-11-08T05:44:37+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-11-06T15:41:33+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-11-01T03:21:07+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2024-10-31T16:09:06+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"32782238599205130037525344761938117754","date":"2024-10-26T20:53:19+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"5319828365356558619768822844896726287","date":"2024-10-24T12:18:29+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"77450047106724144222845451205080442047","date":"2024-10-21T15:48:48+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"166462891587376216220737815516382655474","date":"2024-10-21T11:47:02+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2024-10-21T11:38:51+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2024-10-03T09:03:55+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2024-09-10T18:50:41+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2024-09-10T08:32:31+00:00","index":"","fulltext":""},{"type":"submitted","content":"Scientific Reports","date":"2024-08-30T09:40:23+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":"627042d2-80c2-43c4-bf34-4769b1ca5b68","owner":[],"postedDate":"November 28th, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":39984983,"name":"Physical sciences/Energy science and technology/Fossil fuels/Coal"},{"id":39984984,"name":"Physical sciences/Physics/Statistical physics thermodynamics and nonlinear dynamics/Thermodynamics"},{"id":39984985,"name":"Earth and environmental sciences/Solid earth sciences/Geodynamics"}],"tags":[],"updatedAt":"2025-01-06T16:04:57+00:00","versionOfRecord":{"articleIdentity":"rs-5002876","link":"https://doi.org/10.1038/s41598-024-83599-7","journal":{"identity":"scientific-reports","isVorOnly":false,"title":"Scientific Reports"},"publishedOn":"2024-12-30 15:57:19","publishedOnDateReadable":"December 30th, 2024"},"versionCreatedAt":"2024-11-28 10:54:23","video":"","vorDoi":"10.1038/s41598-024-83599-7","vorDoiUrl":"https://doi.org/10.1038/s41598-024-83599-7","workflowStages":[]},"version":"v1","identity":"rs-5002876","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-5002876","identity":"rs-5002876","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}