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Article: The effects of intermediate principle stress on the mechanical behavior of transversely isotropic rocks: Insights from DEM simulations
Title | The effects of intermediate principle stress on the mechanical behavior of transversely isotropic rocks: Insights from DEM simulations |
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Authors | |
Keywords | discrete element method intermediate stress transversely isotropic rock true triaxial test |
Issue Date | 2020 |
Publisher | John Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/3312 |
Citation | International Journal for Numerical and Analytical Methods in Geomechanics, 2020, v. 44 n. 9, p. 1262-1280 How to Cite? |
Abstract | The discrete element method (DEM) is used to study the response of anisotropic rocks under true triaxial testing. Numerical samples of seven different bedding orientations (β = 0o, 15o, 30o, 45o, 60o, 75o, and 90o) are created. Six series of test simulations (σ 3 = 0, 10, 30, 50, 70, and 100 MPa) are conducted on each sample, with five different σ 2 values, varied from σ 3 to σ 1 . The effects of anisotropy and intermediate stress on the peak strength, brittle‐ductile transition, and degree of anisotropy are subsequently explained through underlying micromechanics. Results show a “fan‐shaped” variation of the peak strength with σ 2 , displaying an ascending‐then‐descending trend. An increasing brittleness with σ 2 is observed at lower confining pressures for all, but medium anisotropy angles. For higher confining pressures, increasing ductility with σ 2 is seen for every anisotropy angle. A U‐shaped variation of peak strength with anisotropy angles is noted that flattens under high intermediate stress. Hence, for numerical models of Posidonia shale under normalized σ 2 higher than 0.76, the anisotropy effect is found to be negligible. Micromechanical analyses reveal that the stress asymmetry, suppression of weak plane action as well as the localization and coalescence of microcracks in the intact rock matrix, due to σ 2 , are the contributors towards the obtained trends. Since existing failure criteria do not weigh in these features in geotechnical assessments, this paper helps future studies by providing a deeper understanding of these effects and a comprehensive data set for the analyses of anisotropic rocks under polyaxial stress conditions. |
Persistent Identifier | http://hdl.handle.net/10722/282904 |
ISSN | 2023 Impact Factor: 3.4 2023 SCImago Journal Rankings: 1.132 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Faizi, SA | - |
dc.contributor.author | Kwok, CY | - |
dc.contributor.author | Duan, K | - |
dc.date.accessioned | 2020-06-05T06:22:54Z | - |
dc.date.available | 2020-06-05T06:22:54Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | International Journal for Numerical and Analytical Methods in Geomechanics, 2020, v. 44 n. 9, p. 1262-1280 | - |
dc.identifier.issn | 0363-9061 | - |
dc.identifier.uri | http://hdl.handle.net/10722/282904 | - |
dc.description.abstract | The discrete element method (DEM) is used to study the response of anisotropic rocks under true triaxial testing. Numerical samples of seven different bedding orientations (β = 0o, 15o, 30o, 45o, 60o, 75o, and 90o) are created. Six series of test simulations (σ 3 = 0, 10, 30, 50, 70, and 100 MPa) are conducted on each sample, with five different σ 2 values, varied from σ 3 to σ 1 . The effects of anisotropy and intermediate stress on the peak strength, brittle‐ductile transition, and degree of anisotropy are subsequently explained through underlying micromechanics. Results show a “fan‐shaped” variation of the peak strength with σ 2 , displaying an ascending‐then‐descending trend. An increasing brittleness with σ 2 is observed at lower confining pressures for all, but medium anisotropy angles. For higher confining pressures, increasing ductility with σ 2 is seen for every anisotropy angle. A U‐shaped variation of peak strength with anisotropy angles is noted that flattens under high intermediate stress. Hence, for numerical models of Posidonia shale under normalized σ 2 higher than 0.76, the anisotropy effect is found to be negligible. Micromechanical analyses reveal that the stress asymmetry, suppression of weak plane action as well as the localization and coalescence of microcracks in the intact rock matrix, due to σ 2 , are the contributors towards the obtained trends. Since existing failure criteria do not weigh in these features in geotechnical assessments, this paper helps future studies by providing a deeper understanding of these effects and a comprehensive data set for the analyses of anisotropic rocks under polyaxial stress conditions. | - |
dc.language | eng | - |
dc.publisher | John Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/3312 | - |
dc.relation.ispartof | International Journal for Numerical and Analytical Methods in Geomechanics | - |
dc.rights | Preprint This is the pre-peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Postprint This is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. | - |
dc.subject | discrete element method | - |
dc.subject | intermediate stress | - |
dc.subject | transversely isotropic rock | - |
dc.subject | true triaxial test | - |
dc.title | The effects of intermediate principle stress on the mechanical behavior of transversely isotropic rocks: Insights from DEM simulations | - |
dc.type | Article | - |
dc.identifier.email | Faizi, SA: saafaizi@connect.hku.hk | - |
dc.identifier.email | Kwok, CY: fkwok8@hku.hk | - |
dc.identifier.authority | Kwok, CY=rp01344 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1002/nag.3060 | - |
dc.identifier.scopus | eid_2-s2.0-85081009498 | - |
dc.identifier.hkuros | 310293 | - |
dc.identifier.volume | 44 | - |
dc.identifier.issue | 9 | - |
dc.identifier.spage | 1262 | - |
dc.identifier.epage | 1280 | - |
dc.identifier.isi | WOS:000517161600001 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0363-9061 | - |