Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation
In this paper, the problem of deformation induced by an open pit excavation in anisotropic stiff soils is analysed by FE modelling. The presented research is focused on the influence of material model with anisotropic stiffness on the accuracy of deformation predictions as compared with the field me...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2023-12-01
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| Series: | Archives of Civil Engineering |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/129762/PDF/art09_int.pdf |
| _version_ | 1827575018419126272 |
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| author | Katarzyna Lisewska Marcin Cudny |
| author_facet | Katarzyna Lisewska Marcin Cudny |
| author_sort | Katarzyna Lisewska |
| collection | DOAJ |
| description | In this paper, the problem of deformation induced by an open pit excavation in anisotropic stiff soils is analysed by FE modelling. The presented research is focused on the influence of material model with anisotropic stiffness on the accuracy of deformation predictions as compared with the field measurements. A new hyperelastic-plastic model is applied to simulate anisotropic mechanical behaviour of stiff soils. It is capable to reproduce mixed variable stress-induced anisotropy and constant inherent cross-anisotropy of the small strain stiffness. The degradation of stiffness depending on strain is modelled with the Brick-type model. The model formulation and parameters are briefly presented. General deformation pattern obtained in the exemplary 2D boundary value problem of an open pit excavation is investigated considering different values of inherent cross-anisotropy coefficient of small strain stiffness. The numerical simulations are performed as a coupled deformation-flow analysis which allows to properly model the drainage conditions. The excavation phases are simulated by removal of soil layers according to the realistic time schedule. Finally, the monitored case of the trial open pit excavation in heavily overconsolidated Oxford Clay at Elstow, UK is simulated with proposed material model both in 2D and 3D conditions. The obtained calculation results are compared with displacement measurements and discussed. |
| first_indexed | 2024-03-08T20:49:18Z |
| format | Article |
| id | doaj.art-f1fbdb45e0c94551b2d788251da99edf |
| institution | Directory Open Access Journal |
| issn | 1230-2945 2300-3103 |
| language | English |
| last_indexed | 2024-03-08T20:49:18Z |
| publishDate | 2023-12-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Civil Engineering |
| spelling | doaj.art-f1fbdb45e0c94551b2d788251da99edf2023-12-22T14:05:44ZengPolish Academy of SciencesArchives of Civil Engineering1230-29452300-31032023-12-01vol. 69No 4141156https://doi.org/10.24425/ace.2023.147652Influence of soil anisotropic stiffness on the deformation induced by an open pit excavationKatarzyna Lisewska0https://orcid.org/0000-0002-5184-9747Marcin Cudny1https://orcid.org/0000-0003-3446-1940Gdansk University of Technology, Faculty of Civil and Environmental Engineering, ul. Gabriela Narutowicza 11/12, 80-233 Gdansk, PolandGdansk University of Technology, Faculty of Civil and Environmental Engineering, ul. Gabriela Narutowicza 11/12, 80-233 Gdansk, PolandIn this paper, the problem of deformation induced by an open pit excavation in anisotropic stiff soils is analysed by FE modelling. The presented research is focused on the influence of material model with anisotropic stiffness on the accuracy of deformation predictions as compared with the field measurements. A new hyperelastic-plastic model is applied to simulate anisotropic mechanical behaviour of stiff soils. It is capable to reproduce mixed variable stress-induced anisotropy and constant inherent cross-anisotropy of the small strain stiffness. The degradation of stiffness depending on strain is modelled with the Brick-type model. The model formulation and parameters are briefly presented. General deformation pattern obtained in the exemplary 2D boundary value problem of an open pit excavation is investigated considering different values of inherent cross-anisotropy coefficient of small strain stiffness. The numerical simulations are performed as a coupled deformation-flow analysis which allows to properly model the drainage conditions. The excavation phases are simulated by removal of soil layers according to the realistic time schedule. Finally, the monitored case of the trial open pit excavation in heavily overconsolidated Oxford Clay at Elstow, UK is simulated with proposed material model both in 2D and 3D conditions. The obtained calculation results are compared with displacement measurements and discussed.https://journals.pan.pl/Content/129762/PDF/art09_int.pdfsoil stiffness anisotropystiff overconsolidated claysopen pit excavationfe modelling |
| spellingShingle | Katarzyna Lisewska Marcin Cudny Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation Archives of Civil Engineering soil stiffness anisotropy stiff overconsolidated clays open pit excavation fe modelling |
| title | Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation |
| title_full | Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation |
| title_fullStr | Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation |
| title_full_unstemmed | Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation |
| title_short | Influence of soil anisotropic stiffness on the deformation induced by an open pit excavation |
| title_sort | influence of soil anisotropic stiffness on the deformation induced by an open pit excavation |
| topic | soil stiffness anisotropy stiff overconsolidated clays open pit excavation fe modelling |
| url | https://journals.pan.pl/Content/129762/PDF/art09_int.pdf |
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