Large cell triaxial tests of a partially saturated soil with vegetation
The use of vegetation roots as a nature-based solution against landslides and erosion requires the definition of sample preparation protocols and adoption of equipment that allows testing representative elementary volumes of the whole soil-root system. For this purpose, large cell triaxial compressi...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2023-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_05005.pdf |
| _version_ | 1797835390941396992 |
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| author | Fraccica Alessandro Romero Enrique Fourcaud Thierry |
| author_facet | Fraccica Alessandro Romero Enrique Fourcaud Thierry |
| author_sort | Fraccica Alessandro |
| collection | DOAJ |
| description | The use of vegetation roots as a nature-based solution against landslides and erosion requires the definition of sample preparation protocols and adoption of equipment that allows testing representative elementary volumes of the whole soil-root system. For this purpose, large cell triaxial compression tests were carried out on fallow and vegetated samples at different degrees of saturation. Samples were prepared by static compaction of a silty sand and seeded with Cynodon dactylon. The hydraulic state during plants growth was controlled and reproduced on bare soil samples. After isotropic compressions, the shearing phase was carried out at very low confining stresses (i.e., below 50 kPa). Tests were deemed to be comparable by assessing the normalised volume of roots with respect to soil, after shearing. For a given confining stress, soil samples with higher matric suction exhibited higher shear strength, furtherly increased by roots. The stress-strain behaviour observed in the vegetated soil systematically changed, when comparing tests at low and high matric suction values, due to the different mechanisms of vegetation reinforcement depending on the hydraulic state at the soil-root interface. The results were successfully interpreted within a failure criterion and skeleton stress framework for partially saturated soils, considering soil suction, degree of saturation, soil microstructure and the normalised volume of roots. |
| first_indexed | 2024-04-09T14:52:10Z |
| format | Article |
| id | doaj.art-81d7e3e255a943fca5c6f9d941d92425 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-04-09T14:52:10Z |
| publishDate | 2023-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-81d7e3e255a943fca5c6f9d941d924252023-05-02T09:28:10ZengEDP SciencesE3S Web of Conferences2267-12422023-01-013820500510.1051/e3sconf/202338205005e3sconf_unsat2023_05005Large cell triaxial tests of a partially saturated soil with vegetationFraccica Alessandro0Romero Enrique1Fourcaud Thierry2Italian Institute for Environmental Protection and Research, ISPRAGeomechanics Group, CIMNECIRAD, UMR AMAPThe use of vegetation roots as a nature-based solution against landslides and erosion requires the definition of sample preparation protocols and adoption of equipment that allows testing representative elementary volumes of the whole soil-root system. For this purpose, large cell triaxial compression tests were carried out on fallow and vegetated samples at different degrees of saturation. Samples were prepared by static compaction of a silty sand and seeded with Cynodon dactylon. The hydraulic state during plants growth was controlled and reproduced on bare soil samples. After isotropic compressions, the shearing phase was carried out at very low confining stresses (i.e., below 50 kPa). Tests were deemed to be comparable by assessing the normalised volume of roots with respect to soil, after shearing. For a given confining stress, soil samples with higher matric suction exhibited higher shear strength, furtherly increased by roots. The stress-strain behaviour observed in the vegetated soil systematically changed, when comparing tests at low and high matric suction values, due to the different mechanisms of vegetation reinforcement depending on the hydraulic state at the soil-root interface. The results were successfully interpreted within a failure criterion and skeleton stress framework for partially saturated soils, considering soil suction, degree of saturation, soil microstructure and the normalised volume of roots.https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_05005.pdf |
| spellingShingle | Fraccica Alessandro Romero Enrique Fourcaud Thierry Large cell triaxial tests of a partially saturated soil with vegetation E3S Web of Conferences |
| title | Large cell triaxial tests of a partially saturated soil with vegetation |
| title_full | Large cell triaxial tests of a partially saturated soil with vegetation |
| title_fullStr | Large cell triaxial tests of a partially saturated soil with vegetation |
| title_full_unstemmed | Large cell triaxial tests of a partially saturated soil with vegetation |
| title_short | Large cell triaxial tests of a partially saturated soil with vegetation |
| title_sort | large cell triaxial tests of a partially saturated soil with vegetation |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2023/19/e3sconf_unsat2023_05005.pdf |
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