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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Randolph, Mark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2022An efficient probabilistic framework for the long-term fatigue assessment of large diameter steel riserscitations
- 2021A Bayesian machine learning approach to rapidly quantifying the fatigue probability of failure for steel catenary riserscitations
- 2021Relationships between lateral and rotational load transfer stiffnesses and soil modulus for the elastic response of monopilescitations
- 2021Centrifuge modelling of pipe-soil interaction in clay with crust layercitations
- 2018An ANN-based framework for rapid spectral fatigue analysis of steel catenary risers
- 2016Evaluation of elastic stiffness parameters for pipeline-soil interactioncitations
- 2015Sensitivity studies of SCR fatigue damage in the touchdown zone using an efficient simplified framework for stress range evaluationcitations
- 2009Characterization of the solid-fluid transition of fine-grained sedimentscitations
- 2009Characterization of the solid-fluid transition of fine-grained sedimentscitations
- 2008Analysis of factors influencing soil classification using normalized piezocone tip resistance and pore pressure parameterscitations
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document
Characterization of the solid-fluid transition of fine-grained sediments
Abstract
<p>Characterization of the strength of fine-grained sediments as they evolve from an intact seabed material to a remolded debris flow is essential to adequately model submarine landslides and their impact on pipelines and other seabed infrastructure. In the current literature, two distinct approaches for modelling this material behavior have been considered. In the soil mechanics approach, fine-grained soils are characterized by the undrained shear strength, s<sub>u</sub>. The critical state framework proposes a relation between s <sub>u</sub> and the water content, or void ratio of the soil. In addition, rate effects and strain softening effects are described by multiplying a reference value of s<sub>u</sub> by a function of the shear strain rate or the accumulated shear strain respectively. In the fluid mechanics approach, slurries of fine-grained material are characterized by a yield strength and a viscosity parameter, which describes the change in shear stress with shear strain rate. Empirical relationships have been proposed, which relate the yield strength and the viscosity to the sediment concentration. This paper demonstrates that the two modelling approaches are essentially similar, with only some formal differences. It is proposed that the strength of fine-grained sediments can be modelled in a unified way over the solid and liquid ranges. To support this unified approach, an experimental campaign has been conducted to obtain strength measurements on various clays prepared at different water content. The testing program includes fall cone tests, vane shear tests, miniature penetrometers (T-bar and ball) and viscometer tests. Rate effects and remolding effects are investigated over a wide range of water contents spanning the domains of behavior that are usually defined separately as soil and fluid. The present paper focuses on analyzing the results of fall cone, vane shear and viscometer tests. Analysis of the results shows that the variation in shear strength over the solid and liquid ranges can be described by a unique function of water content - suitably normalized - for a given soil. Furthermore, the effect of strain rate and degree of remolding can be accounted for by multiplying the basic strength parameter by appropriate functions, which are independent of the current water content.</p>