{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/102838"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/102838","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Axial behavior of drilled shafts socketed into weak Pennsylvanian shales","abstract":"DSpace SAF Submission Ingestion Package generated from Vireo submission #13215 on 2019-02-07 at 14:22:36","abstract_html":"DSpace SAF Submission Ingestion Package generated from Vireo submission #13215 on 2019-02-07 at 14:22:36","abstract_has_math":false,"creators":["Baghdady, Ahmed K."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Stark, Timothy D.","Mesri, Gholamreza","Long, James H.","Elbanna, Ahmed"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-02-07T20:44:23Z","date_published":"2019-02-07T20:44:23Z","updated_at":"2026-07-22T22:24:42Z","subjects":["Drilled Shaft","Weak Shales","MSPT"],"languages":["en"],"rights":["Copyright 2018 Ahmed Khaled Hassan Ahmed Baghdady"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/102838","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Stark, Timothy D.","Mesri, Gholamreza","Long, James H.","Elbanna, Ahmed"]},{"key":"dc:creator","label":"Author","values":["Baghdady, Ahmed K."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-02-07T20:44:23Z","2021-02-08T10:15:11Z","2018-12-06","2018-12"]},{"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":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"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":["Drilled Shaft","Weak Shales","MSPT"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Ahmed Khaled Hassan Ahmed Baghdady"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/102838"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["DSpace SAF Submission Ingestion Package generated from Vireo submission #13215 on 2019-02-07 at 14:22:36","Made available in DSpace on 2019-02-07T20:44:23Z (GMT). No. of bitstreams: 2 BAGHDADY-DISSERTATION-2018.pdf: 17480217 bytes, checksum: c2473bbcc70edee8570b051bd883479d (MD5) LICENSE.txt: 4218 bytes, checksum: c695c73a6d1fca0e2f2e39e1ac732c21 (MD5) Previous issue date: 2018-12-06","Embargo set by: Seth Robbins for item 109864 Lift date: 2021-02-07T20:44:35Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 109864 on 2021-02-08T10:15:11Z.","Weak Shales of the Pennsylvanian period are frequently encountered at shallow depths in Illinois. Drilled shafts socketed in weak shales are increasingly used to support structural loads from bridges and other transportation structures because they are more economical compared to other deep foundation systems. The design of a drilled shaft requires the knowledge of both strength and compressibility parameters of the weak shales. However, in most cases, the weathered nature and fragility of the weak shales prohibit recovering undisturbed core samples for laboratory triaxial compression testing. As a result, in situ tests are required to quantify the compressive strength and compressibility of weak shales. In this study, the procedure for conducting the standard penetration test (SPT) was modified and calibrated to assess the in situ properties of weak shales for drilled shaft design. Correlations between the penetration rate in weak shales and the unconfined compressive strength and undrained modulus were then developed based on a subsurface investigation at twenty-one (21) weak shale sites throughout Illinois. Two (2) Osterberg load cell (O-cell) field tests on instrumented drilled shafts socketed into weak shales also were conducted during this study to investigate the load transfer mechanism in side and tip resistance and the magnitude of the mobilized resistances in weak shales. Modified standard penetration tests and shale coring were conducted at these two load test sites and other fourteen (14) full-scale load test sites in Missouri and Illinois to validate the penetration rate design correlations. In addition, two (2) databases of measured side and tip resistance of drilled shafts in weak shales, around the world, were collected from the literature and also utilized in this investigation. Finally, a numerical model was developed to investigate the factors influencing the axial behavior of drilled shafts in weak shales. The results of the numerical analysis, field load tests, and penetration rates in weak shales are used to develop a design procedure for axially loaded drilled shafts in weak shales.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01","The student, Ahmed Baghdady, accepted the attached license on 2018-12-06 at 07:52.","The student, Ahmed Baghdady, submitted this Dissertation for approval on 2018-12-06 at 08:52.","This Dissertation was approved for publication on 2018-12-06 at 15:43."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Axial behavior of drilled shafts socketed into weak Pennsylvanian shales"]}]}],"canonical_facts":{"dc:contributor":["Stark, Timothy D.","Mesri, Gholamreza","Long, James H.","Elbanna, Ahmed"],"dc:creator":["Baghdady, Ahmed K."],"dc:date":["2019-02-07T20:44:23Z","2021-02-08T10:15:11Z","2018-12-06","2018-12"],"dc:description":["DSpace SAF Submission Ingestion Package generated from Vireo submission #13215 on 2019-02-07 at 14:22:36","Made available in DSpace on 2019-02-07T20:44:23Z (GMT). No. of bitstreams: 2 BAGHDADY-DISSERTATION-2018.pdf: 17480217 bytes, checksum: c2473bbcc70edee8570b051bd883479d (MD5) LICENSE.txt: 4218 bytes, checksum: c695c73a6d1fca0e2f2e39e1ac732c21 (MD5) Previous issue date: 2018-12-06","Embargo set by: Seth Robbins for item 109864 Lift date: 2021-02-07T20:44:35Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 109864 on 2021-02-08T10:15:11Z.","Weak Shales of the Pennsylvanian period are frequently encountered at shallow depths in Illinois. Drilled shafts socketed in weak shales are increasingly used to support structural loads from bridges and other transportation structures because they are more economical compared to other deep foundation systems. The design of a drilled shaft requires the knowledge of both strength and compressibility parameters of the weak shales. However, in most cases, the weathered nature and fragility of the weak shales prohibit recovering undisturbed core samples for laboratory triaxial compression testing. As a result, in situ tests are required to quantify the compressive strength and compressibility of weak shales. In this study, the procedure for conducting the standard penetration test (SPT) was modified and calibrated to assess the in situ properties of weak shales for drilled shaft design. Correlations between the penetration rate in weak shales and the unconfined compressive strength and undrained modulus were then developed based on a subsurface investigation at twenty-one (21) weak shale sites throughout Illinois. Two (2) Osterberg load cell (O-cell) field tests on instrumented drilled shafts socketed into weak shales also were conducted during this study to investigate the load transfer mechanism in side and tip resistance and the magnitude of the mobilized resistances in weak shales. Modified standard penetration tests and shale coring were conducted at these two load test sites and other fourteen (14) full-scale load test sites in Missouri and Illinois to validate the penetration rate design correlations. In addition, two (2) databases of measured side and tip resistance of drilled shafts in weak shales, around the world, were collected from the literature and also utilized in this investigation. Finally, a numerical model was developed to investigate the factors influencing the axial behavior of drilled shafts in weak shales. The results of the numerical analysis, field load tests, and penetration rates in weak shales are used to develop a design procedure for axially loaded drilled shafts in weak shales.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01","The student, Ahmed Baghdady, accepted the attached license on 2018-12-06 at 07:52.","The student, Ahmed Baghdady, submitted this Dissertation for approval on 2018-12-06 at 08:52.","This Dissertation was approved for publication on 2018-12-06 at 15:43."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/102838"],"dc:language":["en"],"dc:rights":["Copyright 2018 Ahmed Khaled Hassan Ahmed Baghdady"],"dc:subject":["Drilled Shaft","Weak Shales","MSPT"],"dc:title":["Axial behavior of drilled shafts socketed into weak Pennsylvanian shales"],"dc:type":["text"],"thesis:degree_discipline":["Civil Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:42Z"}