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Hydro-mechanical behaviour of a weathered marine chalk

Abstract : An offshore wind farm will be developed in France at the Fecamp site covering in excess of 67 km². In this location, medium to high density chalk containing flint nodules is found. In this paper, some of the hydro-mechanical properties of this specific marine chalk are presented, aiming to characterize the first meters of the chalk more precisely for the design of gravity base foundations. A series of un-drained static and cyclic triaxial tests carried out on 100 mm and 300 mm diameter specimens of weathered chalk are presented. Specimens have been recovered from 100 mm, 300 and 500 mm diameter vibrocore sections. Results show, upon undrained static tests, that the material presents essentially dilative behaviour and usually generates negative excess pore water pressures during shear. Upon undrained cyclic tests, the material shows a progressive development of fairly significant positive excess pore water pressures and relatively high values of axial strains. Results also indicate that the excess pore water pressure dissipation, after a sequence of cycles, induces a densification of the material which results, upon post-cyclic undrained static shear, in a more dilative response resulting in higher values of undrained shear strength.
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https://hal.archives-ouvertes.fr/hal-01985562
Contributor : Rawaz Dlawar Muhammed <>
Submitted on : Friday, January 18, 2019 - 10:20:24 AM
Last modification on : Tuesday, December 8, 2020 - 10:21:06 AM

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Rawaz Dlawar Muhammed, E Palix, M Duc, Jean Claude Dupla, Jean Canou. Hydro-mechanical behaviour of a weathered marine chalk. Engineering in Chalk, Sep 2018, Londres, United Kingdom. ⟨10.1680/eiccf.64072.535⟩. ⟨hal-01985562⟩

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