{"667323":{"#nid":"667323","#data":{"type":"event","title":"PhD Defense by Luis Vergaray","body":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003EPh.D. Thesis Defense Announcement\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EMechanistic Liquefaction Assessment of Mine Tailings\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003EBy\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ELuis Vergaray\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003EAdvisor(s):\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EDr. Jorge Macedo (CEE)\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003ECommittee Members:\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EDr. Susan Burns (CEE), Dr. David Frost (CEE), Dr. Paul Mayne (CEE), Dr. Zhigang Peng (EAS)\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003EDate \u0026amp; Time:\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003EApril 26, 2023 at 11:00 am\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003ELocation:\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u0026nbsp;\u003Cspan\u003E(Hybrid) SEB 122 and Zoom: \u003Cspan\u003E\u003Ca href=\u0022https:\/\/gatech.zoom.us\/j\/99912367893?pwd=bGpXd0lkaUVLOHMxb2pVYllUM1ZkZz09\u0022\u003Ehttps:\/\/gatech.zoom.us\/j\/99912367893?pwd=bGpXd0lkaUVLOHMxb2pVYllUM1ZkZz09\u003C\/a\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u0026nbsp;\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EDuring the last decade, tailings storage facility (TSF) failures have caused unprecedented\u0026nbsp;\u003Cbr \/\u003E\r\nenvironmental consequences and loss of human lives worldwide (e.g., Brazil, Australia, Canada, and\u0026nbsp;\u003Cbr \/\u003E\r\nSouth Africa). A failure in the United States, similar to other recent ones, may cause dramatic\u0026nbsp;\u003Cbr \/\u003E\r\ndamage to the environment, state economies, and local communities. The static liquefaction\u0026nbsp;\u003Cbr \/\u003E\r\nphenomenon has been prevalent in several of the recent TSF failures, e.g., the 2015 Fundao failure,\u0026nbsp;\u003Cbr \/\u003E\r\nwhere the stored mine tailings liquefied. Cyclic liquefaction has also historically affected TSFs.\u0026nbsp;\u003Cbr \/\u003E\r\nA prime example is the 2010 Las Palmas failure after the Mw 8.8 Maule earthquake in Chile, where\u0026nbsp;\u003Cbr \/\u003E\r\nthe stored tailings suffered flow liquefaction. Assessing the liquefaction phenomenon in mine\u0026nbsp;\u003Cbr \/\u003E\r\ntailings imposes several fundamental challenges as tailings are man-made young materials with\u0026nbsp;\u003Cbr \/\u003E\r\nangular grains, often lower proportions of quartz, and significant compressibility. Thus, standard\u0026nbsp;\u003Cbr \/\u003E\r\ngeotechnical methods and correlations should not be taken as applicable to tailings without\u0026nbsp;\u003Cbr \/\u003E\r\ndetailed consideration of these factors. Moreover, there is a disparity in how static and cyclic\u0026nbsp;\u003Cbr \/\u003E\r\nliquefaction are assessed. Often the former considers mechanical parameters, whereas the latter\u0026nbsp;\u003Cbr \/\u003E\r\nrelies on empirical methods developed for natural soils. In this context, this thesis contributes\u0026nbsp;\u003Cbr \/\u003E\r\nto advancing the understanding of the mechanical properties of mine tailings for liquefaction\u0026nbsp;\u003Cbr \/\u003E\r\nassessments considering static and cyclic solicitations. In addition, it proposes changing the\u0026nbsp;\u003Cbr \/\u003E\r\nparadigms in assessing cyclic liquefaction by bringing mechanics. Towards these goals, (1) trends\u0026nbsp;\u003Cbr \/\u003E\r\nin mechanical parameters for assessing static liquefaction are discussed, (2) the static\u0026nbsp;\u003Cbr \/\u003E\r\nliquefaction phenomenon is assessed under prevailing drained paths that have shown relevance on\u0026nbsp;\u003Cbr \/\u003E\r\ncase histories, (3) insights gained from interpreting liquefaction-oriented laboratory tests\u0026nbsp;\u003Cbr \/\u003E\r\nconsidering contrasting mine tailings gradations are shared, (4) the role of spatial variability in\u0026nbsp;\u003Cbr \/\u003E\r\ndeposited tailings is showcased, (5) the robustness of a mechanistic framework for assessing cyclic\u0026nbsp;\u003Cbr \/\u003E\r\nliquefaction is assessed, and (6) its application to a case history with materials with contrasting\u0026nbsp;\u003Cbr \/\u003E\r\nproperties is showcased.\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cbr \/\u003E\r\n\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EKeywords: Mine tailings, Static liquefaction, Cylic liquefaction, Critical state, Spatial\u0026nbsp;\u003Cbr \/\u003E\r\nvariability\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EMechanistic Liquefaction Assessment of Mine Tailings\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"Mechanistic Liquefaction Assessment of Mine Tailings"}],"uid":"27707","created_gmt":"2023-04-13 18:13:56","changed_gmt":"2023-04-13 18:13:56","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2023-04-26T11:00:00-04:00","event_time_end":"2023-04-26T13:00:00-04:00","event_time_end_last":"2023-04-26T13:00:00-04:00","gmt_time_start":"2023-04-26 15:00:00","gmt_time_end":"2023-04-26 17:00:00","gmt_time_end_last":"2023-04-26 17:00:00","rrule":null,"timezone":"America\/New_York"},"location":"SEB 122 ","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}