https://m2.mtmt.hu/ hun 2026-10-23 20:59 JournalArticle 36454998 ADMIN_APPROVED true 0 false 2026-06-01T10:49:49.064+0000 2026-04-24T08:09:56.042+0000 2025-11-25T11:20:35.638+0000 true 10072271 Andódy Katalin /api/admin/10072271 Admin true 2026-04-24T08:09:56.294+0000 2026-04-24T08:09:56.294+0000 2026-02-02T09:41:28.921+0000 true 10072271 Andódy Katalin /api/admin/10072271 Admin true Admin 10063514 /api/admin/10063514 Mikola Katalin true 10063514 true 2026-04-08T21:03:36.553+0000 true false true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle true 10000059 Article true 24 24 /api/publicationtype/24 PublicationType 1 true 24 JournalArticle /api/subtype/10000059 Szakcikk SubType 101 true 10000059 true 1 /api/category/1 Category true 1 Narimani, Samad New Insights Into Poisson's Ratio Variability in Rocks Under Load true true /api/journal/2071 REVIEWED true false 2071 false 2071 true 0363-9061 1096-9853 Journal FOREIGN 50 2 854 869 854 16 2026 Poisson's ratio is a fundamental parameter in rock mechanics, traditionally often treated as a constant. This study challenges that notion by developing a universal empirical model that captures its significant stress-dependency from initial loading to failure. The model was rigorously calibrated using 42 uniaxial compressive tests on granite and successfully generalized to limestone, marl, sandstone, and saltstone, representing a wide spectrum of mechanical behaviors from brittle to ductile. Its predictive accuracy was quantified using root mean square error (RMSE), mean absolute error (MAE), and mean absolute percentage error (MAPE). The model demonstrated high fidelity, particularly at the critical crack initiation stage (sigma/sigma c = 0.5), where errors were minimized. Across all five rock types and three calculation methods (secant, average, tangent), the MAPE ranged from 1.4% to 3.7%, RMSE from 0.007 to 0.012, and MAE from 0.005 to 0.010. Performance was superior for ductile rocks like marl (MAPE approximate to 1.9%) and saltstone (MAPE approximate to 1.4%) due to their homogeneous deformation, while effectively capturing the more complex, crack-dominated response of granite and sandstone. The research conclusively demonstrates that Poisson's ratio is not a fixed material property but a dynamically evolving parameter. This work provides a practical and robust framework that moves beyond the assumption of a constant Poisson's ratio, offering a significant improvement for accurate deformation analysis in numerical modeling, underground excavation design, and reservoir geomechanics. true true NATIONAL 2025 true true true false true false NONE 2026-06-01 false 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 7 D1 false false false false 2025-11-24T13:32:35.833+0000 Geotechnika és Mérnökgeológia Tanszék (BME / ÉMK) 2 13 1 2 0 true 10063514 Language 10002 /api/language/10002 Angol English true 2 true PersonAuthorship 128667095 /api/authorship/128667095 1 0.5 true false true Author 10081821 /api/author/10081821 Narimani Ghourtlar Samad true true Narimani Samad true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PersonAuthorship 128667096 /api/authorship/128667096 2 0.5 false true false Author 10002250 /api/author/10002250 Vásárhelyi Balázs true 10002250 true Vásárhelyi Balázs true false false AuthorshipType 1 /api/authorshiptype/1 0 true 0 true false true PublicationIdentifier 30219399 /api/publicationidentifier/30219399 PlainSource 6 /api/publicationsource/6 PublicationSourceType 10001 /api/publicationsourcetype/10001 true true true DOI DOI https://doi.org/@@@ true true 6 true IDENTICAL 10.1002/nag.70146 https://doi.org/10.1002/nag.70146 false true PublicationIdentifier 30219400 /api/publicationidentifier/30219400 PlainSource 1 /api/publicationsource/1 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true WoS WoS https://www.webofscience.com/wos/woscc/full-record/@@@ true true 1 true IDENTICAL 001613735200001 https://www.webofscience.com/wos/woscc/full-record/001613735200001 false true PublicationIdentifier 30219428 /api/publicationidentifier/30219428 PlainSource 3 /api/publicationsource/3 PublicationSourceType 10003 /api/publicationsourcetype/10003 false true true Scopus Scopus http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-@@@ true true 3 true IDENTICAL 105021527651 http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-105021527651 false true PublicationIdentifier 30203571 /api/publicationidentifier/30203571 PlainSource 40 /api/publicationsource/40 PublicationSourceType 10006 /api/publicationsourcetype/10006 true true true Egyéb URL Other URL @@@ true true 40 true https://onlinelibrary.wiley.com/doi/10.1002/nag.70146 https://onlinelibrary.wiley.com/doi/10.1002/nag.70146 false true Keyword 1538 /api/keyword/1538 true 1538 true Keyword 7239 /api/keyword/7239 true 7239 true Keyword 12051 /api/keyword/12051 true 12051 true Keyword 13403 /api/keyword/13403 true 13403 true Keyword 1000485 /api/keyword/1000485 true 1000485 true Keyword 1020712 /api/keyword/1020712 true 1020712 true Keyword 1098811 /api/keyword/1098811 true 1098811 true Keyword 1493583 /api/keyword/1493583 true true Keyword 1643416 /api/keyword/1643416 true true Keyword 1707725 /api/keyword/1707725 true true Keyword 1887138 /api/keyword/1887138 true true Keyword 3937096 /api/keyword/3937096 true true SjrRating 11688122 /api/sjrrating/11688122 8 0.1 journal RatingType 10002 /api/ratingtype/10002 sjr true true ClassificationExternal 2206 /api/classificationexternal/2206 true 2206 true D1 FROM_LAST_YEAR true true /api/publication/36454998 <div class="JournalArticle Publication long-list"> <div class="authors"> <img title="Forrásközlemény" style="float: left" src="/frontend/resources/grid/publication-core-icon.png"> <img title="Idézőközlemény" style="float: left" src="/frontend/resources/grid/publication-citation-icon.png"> <div class="autype autype0"> <span class="author-name" mtid="10081821"><a href="/gui2/?type=authors&mode=browse&sel=10081821" target="_blank">Narimani Samad ✉ (<span class="authorship-author-name">Narimani Ghourtlar Samad</span> <span class="authorAux-mtmt"> Geotechnics, Geology, Rock Mechanics, Tunneling...</span>) </a> </span> <span class="author-affil"><span title="Budapesti Műszaki és Gazdaságtudományi Egyetem">BME</span>/<span title="Építőmérnöki Kar">ÉMK</span>/Geotechnika és Mérnökgeológia Tanszék</span> ;&nbsp;&nbsp;&nbsp; <span class="author-name" mtid="10002250"><a href="/gui2/?type=authors&mode=browse&sel=10002250" target="_blank">Vásárhelyi Balázs (<span class="authorship-author-name">Vásárhelyi Balázs</span> <span class="authorAux-mtmt"> Kőzetmechanika</span>) </a> </span> <span class="author-affil"><span title="Budapesti Műszaki és Gazdaságtudományi Egyetem">BME</span>/<span title="Építőmérnöki Kar">ÉMK</span>/Geotechnika és Mérnökgeológia Tanszék</span> </div> </div> <div class="title"><a href="/gui2/?mode=browse&params=publication;36454998" target="_blank">New Insights Into Poisson's Ratio Variability in Rocks Under Load</a></div> <div> <span class="journal-title">INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS</span> <span class="journal-issn">(<a target="_blank" href="https://portal.issn.org/resource/ISSN/0363-9061">0363-9061</a> <a target="_blank" href="https://portal.issn.org/resource/ISSN/1096-9853">1096-9853</a>)</span>: <span class="journal-volume">50</span> <span class="journal-issue">2</span> <span class="page"> pp 854-869 </span> <span class="year">(2026)</span> </div> <div class="pub-footer"> <span class="language" xmlns="http://www.w3.org/1999/html">Nyelv: Angol | </span> <span class="identifiers"> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="10.1002/nag.70146" target="_blank" href="https://doi.org/10.1002/nag.70146"> DOI </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="001613735200001" target="_blank" href="https://www.webofscience.com/wos/woscc/full-record/001613735200001"> WoS </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:blue" title="105021527651" target="_blank" href="http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-105021527651"> Scopus </a> </span> <span class="id identifier oa_none" title="none"> <a style="color:black" title="https://onlinelibrary.wiley.com/doi/10.1002/nag.70146" target="_blank" href="https://onlinelibrary.wiley.com/doi/10.1002/nag.70146"> Egyéb URL </a> </span> </span> <OnlyViewableByAuthor><div class="ratings"> <div class="journal-subject">Folyóirat szakterülete: Scopus - Computational Mechanics&nbsp;&nbsp;&nbsp;SJR indikátor:&nbsp;D1</div> <div class="journal-subject">Folyóirat szakterülete: Scopus - Geotechnical Engineering and Engineering Geology&nbsp;&nbsp;&nbsp;SJR indikátor:&nbsp;Q1</div> <div class="journal-subject">Folyóirat szakterülete: Scopus - Materials Science (miscellaneous)&nbsp;&nbsp;&nbsp;SJR indikátor:&nbsp;Q1</div> <div class="journal-subject">Folyóirat szakterülete: Scopus - Mechanics of Materials&nbsp;&nbsp;&nbsp;SJR indikátor:&nbsp;Q1</div> </div></OnlyViewableByAuthor> <div class="publication-citation"> <a target="_blank" href="/api/publication?cond=citations.related;eq;36454998&sort=publishedYear,desc&sort=title"> Idézett közlemények száma: 7 </a> </div> <div class="mtid"><span class="long-pub-mtid">Közlemény: 36454998</span> | <span class="status-data status-ADMIN_APPROVED"> Admin láttamozott </span> Forrás Idéző | <span class="type-subtype">Folyóiratcikk ( Szakcikk ) </span> | <span class="pub-category">Tudományos</span> | <span class="publication-sourceOfData">WOS TAGGED</span> </div> <div class="lastModified">Utolsó módosítás: 2026.04.24. 10:09 Mikola Katalin (MTMT 3, admin) </div> <div class="lockedBy">Központi kezelésű 2026.04.08. 23:03 Mikola Katalin (MTMT 3, admin) </div> </div></div>