Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependence
The convergence confinement methods are solutions employed to estimate convergence in circular tunnels. They are mostly based on constitutive equations governed by the Mohr-Coulomb and Hoek-Brown yield criteria. However, the solutions based on these criteria neglect the intermediate principal stress...
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Format: | Article |
Language: | English |
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Elsevier
2020-05-01
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Series: | International Journal of Mining Science and Technology |
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Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268619305932 |
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author | Eugie Kabwe |
author_facet | Eugie Kabwe |
author_sort | Eugie Kabwe |
collection | DOAJ |
description | The convergence confinement methods are solutions employed to estimate convergence in circular tunnels. They are mostly based on constitutive equations governed by the Mohr-Coulomb and Hoek-Brown yield criteria. However, the solutions based on these criteria neglect the intermediate principal stress confining effect on the ground reaction estimation. Therefore, in this paper, a Drucker-Prager yield criterion governed solution integrated with the Lode angle parameter is employed. It considers the intermediate principal stress influence and the critical effect of the parameter on failure characterization. Subsequently, it is verified with results attained from numerical simulations which consider an elastic-perfectly plastic constitutive law with a non-associative flow rule within FLAC3D. It was drawn from the results that the ground reaction and plastic evolution are influenced by the confining stress. Furthermore, considering a suitable yield criterion leads to realistic convergence and plastic evolution estimation. The circumscribed DP criterion governed solution with Lode angle parameter value (0.8) is considered appropriate for the realistic ground reaction estimation in the three-dimensional (3D) stress state rock mass. It estimates approximately 3.4% of tunnel convergence as compared to the classic solutions (5%) and plastic radius estimated to be approximately 2.45 m compared to 2.84 m. |
first_indexed | 2024-12-21T14:49:21Z |
format | Article |
id | doaj.art-51da6b06deae48ec8f128e58e92222c5 |
institution | Directory Open Access Journal |
issn | 2095-2686 |
language | English |
last_indexed | 2024-12-21T14:49:21Z |
publishDate | 2020-05-01 |
publisher | Elsevier |
record_format | Article |
series | International Journal of Mining Science and Technology |
spelling | doaj.art-51da6b06deae48ec8f128e58e92222c52022-12-21T18:59:55ZengElsevierInternational Journal of Mining Science and Technology2095-26862020-05-01303431440Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependenceEugie Kabwe0School of Civil, Environmental and Mining Engineering, University of Adelaide, Adelaide 5005, AustraliaThe convergence confinement methods are solutions employed to estimate convergence in circular tunnels. They are mostly based on constitutive equations governed by the Mohr-Coulomb and Hoek-Brown yield criteria. However, the solutions based on these criteria neglect the intermediate principal stress confining effect on the ground reaction estimation. Therefore, in this paper, a Drucker-Prager yield criterion governed solution integrated with the Lode angle parameter is employed. It considers the intermediate principal stress influence and the critical effect of the parameter on failure characterization. Subsequently, it is verified with results attained from numerical simulations which consider an elastic-perfectly plastic constitutive law with a non-associative flow rule within FLAC3D. It was drawn from the results that the ground reaction and plastic evolution are influenced by the confining stress. Furthermore, considering a suitable yield criterion leads to realistic convergence and plastic evolution estimation. The circumscribed DP criterion governed solution with Lode angle parameter value (0.8) is considered appropriate for the realistic ground reaction estimation in the three-dimensional (3D) stress state rock mass. It estimates approximately 3.4% of tunnel convergence as compared to the classic solutions (5%) and plastic radius estimated to be approximately 2.45 m compared to 2.84 m.http://www.sciencedirect.com/science/article/pii/S2095268619305932Convergence confinement methodsDrucker-PragerGround reactionLode angle parameterYield criterion |
spellingShingle | Eugie Kabwe Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependence International Journal of Mining Science and Technology Convergence confinement methods Drucker-Prager Ground reaction Lode angle parameter Yield criterion |
title | Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependence |
title_full | Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependence |
title_fullStr | Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependence |
title_full_unstemmed | Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependence |
title_short | Confining stress effect on the elastoplastic ground reaction considering the Lode angle dependence |
title_sort | confining stress effect on the elastoplastic ground reaction considering the lode angle dependence |
topic | Convergence confinement methods Drucker-Prager Ground reaction Lode angle parameter Yield criterion |
url | http://www.sciencedirect.com/science/article/pii/S2095268619305932 |
work_keys_str_mv | AT eugiekabwe confiningstresseffectontheelastoplasticgroundreactionconsideringthelodeangledependence |