Geomechanical constitutive modelling of gas-hydrate-bearing sediments

Type Proceedings paper
Date 2011
Language English
Author(s) Sultan NabilORCID, Garziglia Sebastien
Meeting The 7th International Conference on Gas Hydrates (ICGH 2011)
Source Proceedings of the 7th International Conference on Gas Hydrates (ICGH 2011), Edinburgh, Scotland, United Kingdom, July 17-21, 2011
Abstract In this work and in order to consider theoretically the effect of gas hydrates on the mechanical properties of their host sediments, hydrate fraction was introduced as a state variable in the framework of a Critical State model. For the proposed model, the process of de-structuration and softening of natural clay was considered as a proxy for the gas-hydrate-bearing-sediments behaviour. The developed constitutive model seemed to reproduce the main key behaviours of gas-hydrate-bearing sands observed by Masui and co-authors: i) the elastic properties (Young Modulus, shear modulus) and the strength of the sediment-hydrate medium increase with the hydrate fraction ii) the mechanical softening of the gas-hydrate bearing sediment is amplified with the hydrate fraction and iii) the dilation angle increases with the hydrate fraction.
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Sultan Nabil, Garziglia Sebastien (2011). Geomechanical constitutive modelling of gas-hydrate-bearing sediments. Proceedings of the 7th International Conference on Gas Hydrates (ICGH 2011), Edinburgh, Scotland, United Kingdom, July 17-21, 2011. https://archimer.ifremer.fr/doc/00035/14626/