Study on Vibration Characteristics of Roadheader Cutting Pre-cracked Hard Rock

Study on Vibration Characteristics of Roadheader Cutting Pre-cracked Hard Rock | 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 Study on Vibration Characteristics of Roadheader Cutting Pre-cracked Hard Rock Hongmei Liu, Faxu Li, Jingqiang He, Wenlong Wang, Haijian Zhang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7422616/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 21 Jan, 2026 Read the published version in Scientific Reports → Version 1 posted 15 You are reading this latest preprint version Abstract In order to reduce the problems of severe vibration and low reliability of the tunnel boring machine in hard rock excavation, mechanical pre-splitting technology is used to improve the cutting characteristics of the tunnel boring machine. The discrete element method is used to establish a rock wall model, and the mechanical expansion and cracking method is used to realize that the three-dimensional rock wall model produces cracks under this action. Using DEM-MFBD two-way coupling technology, the vibration characteristics of roadheader before and after pre-splitting are analyzed. The study found that when using a boring machine to carry out rock wall pre-splitting operations, the average load of the cutting head was 8.2% lower than that when no pre-splitting operations were carried out, and the average load in the three directions of X, Y, and Z were reduced by 11.7%, 3.5% and 7.7% respectively. The load fluctuation coefficient decreased from 0.0242 to 0.0213; Frequency domain analysis revealed that the maximum acceleration amplitude in the 20–30 Hz primary vibration band for the cutting head, cutting arm, and rotary table decreased by 14.7%, 8.7%, and 3.6% respectively compared to the non-pre-cracking condition. The vibration suppression effect exhibited a pattern of ‘cutting head > cutting arm > rotary table’. Consequently, mechanical pre-cracking technology reduces excavator vibration during cutting operations by diminishing rock wall strength. This holds significant importance for enhancing excavator operational reliability and provides valuable reference for excavator cutting of hard rock formations. Physical sciences/Energy science and technology Physical sciences/Engineering hard rock excavation boring machine mechanical expansion and cracking DEM-MFBD bidirectional coupling vibration characteristics Full Text Additional Declarations No competing interests reported. Supplementary Files data.zip Cite Share Download PDF Status: Published Journal Publication published 21 Jan, 2026 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 19 Nov, 2025 Reviews received at journal 18 Nov, 2025 Reviews received at journal 17 Nov, 2025 Reviewers agreed at journal 05 Nov, 2025 Reviewers agreed at journal 05 Nov, 2025 Reviewers agreed at journal 05 Nov, 2025 Reviewers agreed at journal 08 Oct, 2025 Reviews received at journal 28 Sep, 2025 Reviewers agreed at journal 09 Sep, 2025 Reviewers agreed at journal 08 Sep, 2025 Reviewers invited by journal 08 Sep, 2025 Editor assigned by journal 08 Sep, 2025 Editor invited by journal 05 Sep, 2025 Submission checks completed at journal 27 Aug, 2025 First submitted to journal 27 Aug, 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-7422616","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":512507557,"identity":"56fa0274-c492-48d6-a3d4-e8ec6868e34a","order_by":0,"name":"Hongmei Liu","email":"","orcid":"","institution":"Liaoning Technical University","correspondingAuthor":false,"prefix":"","firstName":"Hongmei","middleName":"","lastName":"Liu","suffix":""},{"id":512507558,"identity":"e7da6f5a-3264-4db5-9991-ff02509d0ee5","order_by":1,"name":"Faxu 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machine, mechanical expansion and cracking, DEM-MFBD bidirectional coupling, vibration characteristics","lastPublishedDoi":"10.21203/rs.3.rs-7422616/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7422616/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eIn order to reduce the problems of severe vibration and low reliability of the tunnel boring machine in hard rock excavation, mechanical pre-splitting technology is used to improve the cutting characteristics of the tunnel boring machine. The discrete element method is used to establish a rock wall model, and the mechanical expansion and cracking method is used to realize that the three-dimensional rock wall model produces cracks under this action. Using DEM-MFBD two-way coupling technology, the vibration characteristics of roadheader before and after pre-splitting are analyzed. The study found that when using a boring machine to carry out rock wall pre-splitting operations, the average load of the cutting head was 8.2% lower than that when no pre-splitting operations were carried out, and the average load in the three directions of X, Y, and Z were reduced by 11.7%, 3.5% and 7.7% respectively. The load fluctuation coefficient decreased from 0.0242 to 0.0213; Frequency domain analysis revealed that the maximum acceleration amplitude in the 20\u0026ndash;30 Hz primary vibration band for the cutting head, cutting arm, and rotary table decreased by 14.7%, 8.7%, and 3.6% respectively compared to the non-pre-cracking condition. The vibration suppression effect exhibited a pattern of \u0026lsquo;cutting head\u0026thinsp;\u0026gt;\u0026thinsp;cutting arm\u0026thinsp;\u0026gt;\u0026thinsp;rotary table\u0026rsquo;. Consequently, mechanical pre-cracking technology reduces excavator vibration during cutting operations by diminishing rock wall strength. This holds significant importance for enhancing excavator operational reliability and provides valuable reference for excavator cutting of hard rock formations.\u003c/p\u003e","manuscriptTitle":"Study on Vibration Characteristics of Roadheader Cutting Pre-cracked Hard Rock","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-09-16 14:46:18","doi":"10.21203/rs.3.rs-7422616/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2025-11-19T19:49:15+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-11-19T03:11:32+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-11-17T06:14:36+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"155442329147214015591032897591419809233","date":"2025-11-06T01:05:40+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"52521646720487161676823388958948506129","date":"2025-11-05T14:05:08+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"282256853319827760972649489210816466031","date":"2025-11-05T06:26:00+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"64395036606717976806217119151566748258","date":"2025-10-08T04:41:20+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-09-28T16:30:28+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"311550335510203693940359603824028853244","date":"2025-09-09T11:43:28+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"10322639550843911048766476615465971660","date":"2025-09-09T01:02:49+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2025-09-08T13:24:38+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2025-09-08T13:19:37+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2025-09-05T11:37:53+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2025-08-28T02:43:32+00:00","index":"","fulltext":""},{"type":"submitted","content":"Scientific Reports","date":"2025-08-28T02:40:37+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":"ba3b1579-ddfd-457b-a15a-3531f51a9cdc","owner":[],"postedDate":"September 16th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"published-in-journal","subjectAreas":[{"id":54438421,"name":"Physical sciences/Energy science and technology"},{"id":54438422,"name":"Physical sciences/Engineering"}],"tags":[],"updatedAt":"2026-01-26T16:01:31+00:00","versionOfRecord":{"articleIdentity":"rs-7422616","link":"https://doi.org/10.1038/s41598-026-37089-7","journal":{"identity":"scientific-reports","isVorOnly":false,"title":"Scientific Reports"},"publishedOn":"2026-01-21 15:58:20","publishedOnDateReadable":"January 21st, 2026"},"versionCreatedAt":"2025-09-16 14:46:18","video":"","vorDoi":"10.1038/s41598-026-37089-7","vorDoiUrl":"https://doi.org/10.1038/s41598-026-37089-7","workflowStages":[]},"version":"v1","identity":"rs-7422616","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7422616","identity":"rs-7422616","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}