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Constitutive Modelling for Sedimentary Evolution at Basin Scale / FOO TAN

Swansea University Author: FOO TAN

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DOI (Published version): 10.23889/SUthesis.58583

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This work is focused on the development of constitutive models for elastoplastic-fracture behaviour in scenarios characterised by large deformation ranging from laboratory to geolog-ical length scale. Both seepage and geomechanical fields are considered, with the assumption of isothermal field.The s...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Peric, Djordje
URI: https://cronfa.swan.ac.uk/Record/cronfa58583
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2021-11-08T17:17:58.3815172</datestamp><bib-version>v2</bib-version><id>58583</id><entry>2021-11-08</entry><title>Constitutive Modelling for Sedimentary Evolution at Basin Scale</title><swanseaauthors><author><sid>7a4005a560783dd99571beab45b1cdc2</sid><firstname>FOO</firstname><surname>TAN</surname><name>FOO TAN</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2021-11-08</date><abstract>This work is focused on the development of constitutive models for elastoplastic-fracture behaviour in scenarios characterised by large deformation ranging from laboratory to geolog-ical length scale. Both seepage and geomechanical fields are considered, with the assumption of isothermal field.The standard Drucker-Prager model is enhanced by applying &#x3C0;-plane correction factor, and the use of hardening properties which depends on the evolution of effective plastic strain. Non-associative potential plastic flow function is used to derive the plastic flow vector. To ensure finite energy dissipation during softening, regularisation technique based on fracture energy approach is adopted. The resulting modified Drucker-Prager model is combined with rotating crack model (which relies on Rankine failure criterion) to develop an elastoplastic-fracture framework by considering multi-step stress update procedures. The advantage of multi-step stress update is that the framework allows the use of any elastoplastic model without any major change in the code. Performance of this set of constitutive models is assessed by studying several simulation examples, including bearing capacity of strip footing, crack propagation in a specimen with pre-existing inclined fault, influence of size effect on borehole instability, influence of pore pressure on thrust fault formation, and hydraulic fracture due to fluid injection. Overall, the numerical results show good agreement with available analytical solutions or experimental findings.For basin-scale problem, SR4 model is used due to its capability to capture the evolution of pre-consolidation pressure pc, that is not considered in Drucker-Prager model. In this case, the goal is to simulate basin-scale gravitational deformation in a prograding delta due to fluid overpressure in shale layer with synkinematic sedimentation. With the aid of adaptive remeshing algorithm, the result successfully produces distinct fault patterns across the prograding delta in terms of plastic strain distribution. In particular, three different zones are observed: extensional, transition, and compressional zone. The extensional zone is characterised by basinward-dipping normal faults, whereas the compressional zone is characterised by basinward-verging fore-thrust faults.Overall, the simulation results illustrate the potential that the developed constitutive models under the integrated flow-geomechanical modelling framework could offer to future analysis of more complex geological evolution.</abstract><type>E-Thesis</type><journal/><volume/><journalNumber/><paginationStart/><paginationEnd/><publisher/><placeOfPublication>Swansea</placeOfPublication><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic/><keywords>Computational geomechanics, constitutive modelling, basin, sedimentary, finite element methods</keywords><publishedDay>8</publishedDay><publishedMonth>11</publishedMonth><publishedYear>2021</publishedYear><publishedDate>2021-11-08</publishedDate><doi>10.23889/SUthesis.58583</doi><url/><notes>A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions.</notes><college>COLLEGE NANME</college><CollegeCode>COLLEGE CODE</CollegeCode><institution>Swansea University</institution><supervisor>Peric, Djordje</supervisor><degreelevel>Doctoral</degreelevel><degreename>Ph.D</degreename><degreesponsorsfunders>Wales National Research Network</degreesponsorsfunders><apcterm/><lastEdited>2021-11-08T17:17:58.3815172</lastEdited><Created>2021-11-08T16:40:34.5768747</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Uncategorised</level></path><authors><author><firstname>FOO</firstname><surname>TAN</surname><order>1</order></author></authors><documents><document><filename>58583__21458__fd17a10151124c218b9b932dda9d705c.pdf</filename><originalFilename>Tan_Foo_P_PhD_Thesis_Final_Redacted.pdf</originalFilename><uploaded>2021-11-08T17:05:19.8788451</uploaded><type>Output</type><contentLength>35913671</contentLength><contentType>application/pdf</contentType><version>Redacted version - open access</version><cronfaStatus>true</cronfaStatus><documentNotes>Copyright: The author, Foo Piew Tan, 2020.</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2021-11-08T17:17:58.3815172 v2 58583 2021-11-08 Constitutive Modelling for Sedimentary Evolution at Basin Scale 7a4005a560783dd99571beab45b1cdc2 FOO TAN FOO TAN true false 2021-11-08 This work is focused on the development of constitutive models for elastoplastic-fracture behaviour in scenarios characterised by large deformation ranging from laboratory to geolog-ical length scale. Both seepage and geomechanical fields are considered, with the assumption of isothermal field.The standard Drucker-Prager model is enhanced by applying π-plane correction factor, and the use of hardening properties which depends on the evolution of effective plastic strain. Non-associative potential plastic flow function is used to derive the plastic flow vector. To ensure finite energy dissipation during softening, regularisation technique based on fracture energy approach is adopted. The resulting modified Drucker-Prager model is combined with rotating crack model (which relies on Rankine failure criterion) to develop an elastoplastic-fracture framework by considering multi-step stress update procedures. The advantage of multi-step stress update is that the framework allows the use of any elastoplastic model without any major change in the code. Performance of this set of constitutive models is assessed by studying several simulation examples, including bearing capacity of strip footing, crack propagation in a specimen with pre-existing inclined fault, influence of size effect on borehole instability, influence of pore pressure on thrust fault formation, and hydraulic fracture due to fluid injection. Overall, the numerical results show good agreement with available analytical solutions or experimental findings.For basin-scale problem, SR4 model is used due to its capability to capture the evolution of pre-consolidation pressure pc, that is not considered in Drucker-Prager model. In this case, the goal is to simulate basin-scale gravitational deformation in a prograding delta due to fluid overpressure in shale layer with synkinematic sedimentation. With the aid of adaptive remeshing algorithm, the result successfully produces distinct fault patterns across the prograding delta in terms of plastic strain distribution. In particular, three different zones are observed: extensional, transition, and compressional zone. The extensional zone is characterised by basinward-dipping normal faults, whereas the compressional zone is characterised by basinward-verging fore-thrust faults.Overall, the simulation results illustrate the potential that the developed constitutive models under the integrated flow-geomechanical modelling framework could offer to future analysis of more complex geological evolution. E-Thesis Swansea Computational geomechanics, constitutive modelling, basin, sedimentary, finite element methods 8 11 2021 2021-11-08 10.23889/SUthesis.58583 A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions. COLLEGE NANME COLLEGE CODE Swansea University Peric, Djordje Doctoral Ph.D Wales National Research Network 2021-11-08T17:17:58.3815172 2021-11-08T16:40:34.5768747 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised FOO TAN 1 58583__21458__fd17a10151124c218b9b932dda9d705c.pdf Tan_Foo_P_PhD_Thesis_Final_Redacted.pdf 2021-11-08T17:05:19.8788451 Output 35913671 application/pdf Redacted version - open access true Copyright: The author, Foo Piew Tan, 2020. true eng
title Constitutive Modelling for Sedimentary Evolution at Basin Scale
spellingShingle Constitutive Modelling for Sedimentary Evolution at Basin Scale
FOO TAN
title_short Constitutive Modelling for Sedimentary Evolution at Basin Scale
title_full Constitutive Modelling for Sedimentary Evolution at Basin Scale
title_fullStr Constitutive Modelling for Sedimentary Evolution at Basin Scale
title_full_unstemmed Constitutive Modelling for Sedimentary Evolution at Basin Scale
title_sort Constitutive Modelling for Sedimentary Evolution at Basin Scale
author_id_str_mv 7a4005a560783dd99571beab45b1cdc2
author_id_fullname_str_mv 7a4005a560783dd99571beab45b1cdc2_***_FOO TAN
author FOO TAN
author2 FOO TAN
format E-Thesis
publishDate 2021
institution Swansea University
doi_str_mv 10.23889/SUthesis.58583
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description This work is focused on the development of constitutive models for elastoplastic-fracture behaviour in scenarios characterised by large deformation ranging from laboratory to geolog-ical length scale. Both seepage and geomechanical fields are considered, with the assumption of isothermal field.The standard Drucker-Prager model is enhanced by applying π-plane correction factor, and the use of hardening properties which depends on the evolution of effective plastic strain. Non-associative potential plastic flow function is used to derive the plastic flow vector. To ensure finite energy dissipation during softening, regularisation technique based on fracture energy approach is adopted. The resulting modified Drucker-Prager model is combined with rotating crack model (which relies on Rankine failure criterion) to develop an elastoplastic-fracture framework by considering multi-step stress update procedures. The advantage of multi-step stress update is that the framework allows the use of any elastoplastic model without any major change in the code. Performance of this set of constitutive models is assessed by studying several simulation examples, including bearing capacity of strip footing, crack propagation in a specimen with pre-existing inclined fault, influence of size effect on borehole instability, influence of pore pressure on thrust fault formation, and hydraulic fracture due to fluid injection. Overall, the numerical results show good agreement with available analytical solutions or experimental findings.For basin-scale problem, SR4 model is used due to its capability to capture the evolution of pre-consolidation pressure pc, that is not considered in Drucker-Prager model. In this case, the goal is to simulate basin-scale gravitational deformation in a prograding delta due to fluid overpressure in shale layer with synkinematic sedimentation. With the aid of adaptive remeshing algorithm, the result successfully produces distinct fault patterns across the prograding delta in terms of plastic strain distribution. In particular, three different zones are observed: extensional, transition, and compressional zone. The extensional zone is characterised by basinward-dipping normal faults, whereas the compressional zone is characterised by basinward-verging fore-thrust faults.Overall, the simulation results illustrate the potential that the developed constitutive models under the integrated flow-geomechanical modelling framework could offer to future analysis of more complex geological evolution.
published_date 2021-11-08T04:15:13Z
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score 11.01753

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