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Strength of a carbonate silt at the solid-fluid transition and submarine landslide run-out

Strength of a carbonate silt at the solid-fluid transition and submarine landslide run-out
Strength of a carbonate silt at the solid-fluid transition and submarine landslide run-out

Submarine landslide run-out is governed by the rheology of the sediment as it evolves from a soil to a viscous fluid. It has been shown previously that the geotechnical characterization of fine-grained sediments can be extended into the liquid range in a continuous fashion (Boukpeti et al. 2012). In this paper, we present the results of strength measurements on a carbonate silt over a wide range of water contents and compare them with results reported previously for two other soils.We then show that a reasonable estimate of submarine slide run-out can be obtained from a simplified analysis based on the energy dissipation through sliding at the base of the slide. Results of the simplified analysis are validated through comparison with run-out predictions obtained using the one-dimensional depth-averaged modelling softwareUWA-SM3. Using a simple formulation to account for water entrainment in the run-out analysis, the influence of the soil rheology on the final run-out is demonstrated. In this case, difference in the rheology of the carbonate silt compared to the non-carbonate fine-grained soils leads to a stronger influence of water entrainment on run-out distance.

1043-1048
CRC Press
Boukpeti, N.
3a09b546-4d1a-498d-986a-02165e5ab4fc
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
Boylan, N.P.
a74ded07-8f6f-4198-bdc9-76e9693091b1
Meyer, Vaughan
Boukpeti, N.
3a09b546-4d1a-498d-986a-02165e5ab4fc
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
Boylan, N.P.
a74ded07-8f6f-4198-bdc9-76e9693091b1
Meyer, Vaughan

Boukpeti, N., White, D.J., Randolph, M.F. and Boylan, N.P. (2015) Strength of a carbonate silt at the solid-fluid transition and submarine landslide run-out. Meyer, Vaughan (ed.) In Frontiers in Offshore Geotechnics III. CRC Press. pp. 1043-1048 .

Record type: Conference or Workshop Item (Paper)

Abstract

Submarine landslide run-out is governed by the rheology of the sediment as it evolves from a soil to a viscous fluid. It has been shown previously that the geotechnical characterization of fine-grained sediments can be extended into the liquid range in a continuous fashion (Boukpeti et al. 2012). In this paper, we present the results of strength measurements on a carbonate silt over a wide range of water contents and compare them with results reported previously for two other soils.We then show that a reasonable estimate of submarine slide run-out can be obtained from a simplified analysis based on the energy dissipation through sliding at the base of the slide. Results of the simplified analysis are validated through comparison with run-out predictions obtained using the one-dimensional depth-averaged modelling softwareUWA-SM3. Using a simple formulation to account for water entrainment in the run-out analysis, the influence of the soil rheology on the final run-out is demonstrated. In this case, difference in the rheology of the carbonate silt compared to the non-carbonate fine-grained soils leads to a stronger influence of water entrainment on run-out distance.

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More information

Published date: 2015
Venue - Dates: Proceedings of the 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015, Oslo, Norway, 2015-06-10 - 2015-06-12

Identifiers

Local EPrints ID: 419766
URI: https://eprints.soton.ac.uk/id/eprint/419766
PURE UUID: 818a10fe-f129-4451-8319-5fbd202fc366
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 20 Apr 2018 16:30
Last modified: 20 Jul 2019 00:25

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