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Bearing capacity of reinforced soil under a strip footing: centrifuge tests

Bearing capacity of reinforced soil under a strip footing: centrifuge tests
Bearing capacity of reinforced soil under a strip footing: centrifuge tests
Geosynthetics can be used to increase the bearing capacity of poor foundation soils and/or to reduce excessive settlements. This paper analyses the case of shallow foundations on reinforced soil using centrifuge tests, namely that of a strip footing on a horizontal ground reinforced with one layer of geosynthetic. The response of reinforced models was compared to that of a similar unreinforced model. The influence of the depth of the reinforcement layer was studied. Two different reinforcement materials were used: a geotextile and a geogrid. The ultimate bearing capacity, as well as the bearing capacity at particular settlement levels were analysed. The results indicate that using one layer of reinforcement contributes to in-creasing the ultimate bearing capacity, provided the reinforcement is adequately positioned. It is likely that the higher limit for the normalized depth of the reinforcement layer recommended in the literature may need to be reduced, when using only one layer of reinforcement. The improvement in bearing capacity at particular settlement levels is important as often the settlement, rather than the bearing capacity, controls design. The models tested exhibited reduced bearing capacity for normalised settlements of 5%B (B, width of the footing), while for smaller normalised settlements (2%B) the reinforcement layer included was effective, particularly when the reinforcement layer was placed nearer to the footing. The experimental data was compared to analytical estimates of the bearing capacity with proposals from the literature. The analytical estimates are optimistic, particularly for the geogrid.
centrifuge tests, strip foundation, reinforced soil, geosynthetic, bearing capacity
Kyparissis, Alexandros
92900d73-daa7-49e5-8c0f-c085f95fe14e
Pinho-Lopes, Margarida
b7e5f7d6-90d8-48cc-b991-0495445fcea4
Kyparissis, Alexandros
92900d73-daa7-49e5-8c0f-c085f95fe14e
Pinho-Lopes, Margarida
b7e5f7d6-90d8-48cc-b991-0495445fcea4

Kyparissis, Alexandros and Pinho-Lopes, Margarida (2018) Bearing capacity of reinforced soil under a strip footing: centrifuge tests. 11th International Conference on Geosynthetics, , Seoul, Korea, Republic of. 16 - 21 Sep 2018. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Geosynthetics can be used to increase the bearing capacity of poor foundation soils and/or to reduce excessive settlements. This paper analyses the case of shallow foundations on reinforced soil using centrifuge tests, namely that of a strip footing on a horizontal ground reinforced with one layer of geosynthetic. The response of reinforced models was compared to that of a similar unreinforced model. The influence of the depth of the reinforcement layer was studied. Two different reinforcement materials were used: a geotextile and a geogrid. The ultimate bearing capacity, as well as the bearing capacity at particular settlement levels were analysed. The results indicate that using one layer of reinforcement contributes to in-creasing the ultimate bearing capacity, provided the reinforcement is adequately positioned. It is likely that the higher limit for the normalized depth of the reinforcement layer recommended in the literature may need to be reduced, when using only one layer of reinforcement. The improvement in bearing capacity at particular settlement levels is important as often the settlement, rather than the bearing capacity, controls design. The models tested exhibited reduced bearing capacity for normalised settlements of 5%B (B, width of the footing), while for smaller normalised settlements (2%B) the reinforcement layer included was effective, particularly when the reinforcement layer was placed nearer to the footing. The experimental data was compared to analytical estimates of the bearing capacity with proposals from the literature. The analytical estimates are optimistic, particularly for the geogrid.

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Accepted/In Press date: 4 January 2018
Published date: 16 September 2018
Venue - Dates: 11th International Conference on Geosynthetics, , Seoul, Korea, Republic of, 2018-09-16 - 2018-09-21
Keywords: centrifuge tests, strip foundation, reinforced soil, geosynthetic, bearing capacity

Identifiers

Local EPrints ID: 425799
URI: http://eprints.soton.ac.uk/id/eprint/425799
PURE UUID: 614ef07c-7f4e-4ebf-96a5-488401e1ad60
ORCID for Margarida Pinho-Lopes: ORCID iD orcid.org/0000-0003-0808-6307

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Date deposited: 02 Nov 2018 17:30
Last modified: 05 Nov 2020 17:32

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Author: Alexandros Kyparissis

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