{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/105954"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/105954","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Assessment of rock fracture initiation using acoustic emission","abstract":"DSpace SAF Submission Ingestion Package generated from Vireo submission #14339 on 2019-11-26 at 14:04:18","abstract_html":"DSpace SAF Submission Ingestion Package generated from Vireo submission #14339 on 2019-11-26 at 14:04:18","abstract_has_math":false,"creators":["Zhong, Yi"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Makhnenko, Roman"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-11-26T20:59:49Z","date_published":"2019-11-26T20:59:49Z","updated_at":"2026-07-22T22:24:45Z","subjects":["acoustic emission","rock fracture","fracture process zone","size effect"],"languages":["en"],"rights":["Copyright 2019 Yi Zhong"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/105954","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Makhnenko, Roman"]},{"key":"dc:creator","label":"Author","values":["Zhong, Yi"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-11-26T20:59:49Z","2021-11-27T10:15:30Z","2019-07-16","2019-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["acoustic emission","rock fracture","fracture process zone","size effect"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 Yi Zhong"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/105954"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["DSpace SAF Submission Ingestion Package generated from Vireo submission #14339 on 2019-11-26 at 14:04:18","Made available in DSpace on 2019-11-26T20:59:49Z (GMT). No. of bitstreams: 2 ZHONG-THESIS-2019.pdf: 1366942 bytes, checksum: bcc155b4a29f4f1f61c1cafb8073789a (MD5) LICENSE.txt: 4205 bytes, checksum: 4b5d8a5919a46c794a973851a06ec606 (MD5) Previous issue date: 2019-07-16","Embargo set by: Seth Robbins for item 113101 Lift date: 2021-11-26T20:59:54Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 113101 on 2021-11-27T10:15:30Z.","It is crucial to understand fracture initiation and propagation in rock as the induced fracture is widely applied in the petroleum industry and rock engineering, and fracture often acts as a precursor to ultimate failure. Due to the relative vast existence of granite and its wide application in tunneling, geothermal systems, and CO2 storage, fracture properties of granite are investigated in this study. Charcoal granite specimens of different sizes and geometries are tested under three- and four-point bending to investigate the effect of these parameters on the dimensions of the fracture process zone measured using acoustic emission (AE) technique. The effects of specimen size, geometry, and loading conditions are found to be more pronounced in the specimens with sizes that are commonly used in the laboratory, while the size effect is predicted to be less significant and eventually negligible as the specimen size increases. It is found that both the fracture process zone length and width increase with the specimen size. In addition, even though the span length is kept the same, the fracture process zone size increases with the increasing specimen depth. Loading condition and specimen geometry also influence the length of the fracture process zone, but have very little effect on its width. Fracture process zone in the post-peak regime is also investigated and found to be approximately constant size. It indicates that the fracture process zone is fully developed at peak load or even prior to it.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-08-01","The student, Yi Zhong, accepted the attached license on 2019-07-16 at 09:22.","The student, Yi Zhong, submitted this Thesis for approval on 2019-07-16 at 09:34.","This Thesis was approved for publication on 2019-07-16 at 10:43."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Assessment of rock fracture initiation using acoustic emission"]}]}],"canonical_facts":{"dc:contributor":["Makhnenko, Roman"],"dc:creator":["Zhong, Yi"],"dc:date":["2019-11-26T20:59:49Z","2021-11-27T10:15:30Z","2019-07-16","2019-08"],"dc:description":["DSpace SAF Submission Ingestion Package generated from Vireo submission #14339 on 2019-11-26 at 14:04:18","Made available in DSpace on 2019-11-26T20:59:49Z (GMT). No. of bitstreams: 2 ZHONG-THESIS-2019.pdf: 1366942 bytes, checksum: bcc155b4a29f4f1f61c1cafb8073789a (MD5) LICENSE.txt: 4205 bytes, checksum: 4b5d8a5919a46c794a973851a06ec606 (MD5) Previous issue date: 2019-07-16","Embargo set by: Seth Robbins for item 113101 Lift date: 2021-11-26T20:59:54Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 113101 on 2021-11-27T10:15:30Z.","It is crucial to understand fracture initiation and propagation in rock as the induced fracture is widely applied in the petroleum industry and rock engineering, and fracture often acts as a precursor to ultimate failure. Due to the relative vast existence of granite and its wide application in tunneling, geothermal systems, and CO2 storage, fracture properties of granite are investigated in this study. Charcoal granite specimens of different sizes and geometries are tested under three- and four-point bending to investigate the effect of these parameters on the dimensions of the fracture process zone measured using acoustic emission (AE) technique. The effects of specimen size, geometry, and loading conditions are found to be more pronounced in the specimens with sizes that are commonly used in the laboratory, while the size effect is predicted to be less significant and eventually negligible as the specimen size increases. It is found that both the fracture process zone length and width increase with the specimen size. In addition, even though the span length is kept the same, the fracture process zone size increases with the increasing specimen depth. Loading condition and specimen geometry also influence the length of the fracture process zone, but have very little effect on its width. Fracture process zone in the post-peak regime is also investigated and found to be approximately constant size. It indicates that the fracture process zone is fully developed at peak load or even prior to it.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-08-01","The student, Yi Zhong, accepted the attached license on 2019-07-16 at 09:22.","The student, Yi Zhong, submitted this Thesis for approval on 2019-07-16 at 09:34.","This Thesis was approved for publication on 2019-07-16 at 10:43."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/105954"],"dc:language":["en"],"dc:rights":["Copyright 2019 Yi Zhong"],"dc:subject":["acoustic emission","rock fracture","fracture process zone","size effect"],"dc:title":["Assessment of rock fracture initiation using acoustic emission"],"dc:type":["text"],"thesis:degree_discipline":["Civil Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:45Z"}