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Discrete element modelling of methane hydrate soil sediments using elongated soil particles

Yu, Y; Cheng, YP; Xu, X; Soga, K; (2016) Discrete element modelling of methane hydrate soil sediments using elongated soil particles. Computers and Geotechnics , 80 pp. 397-409. 10.1016/j.compgeo.2016.03.004. Green open access

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Abstract

In this discrete element modelling research, triaxial compression tests of particle assemblies were simulated to study the mechanical behaviour of methane hydrate sediments with two different hydrate formation patterns: pore-filling and cementation. The soil particles were modelled using spherical or elongated particles (two aspect ratios 1.5 and 2.0). Hydrates were modelled as smaller particles and were placed either inside the pores in a random manner (the pore-filling case) or around the soil particle contacts (the cementation case). Compared to the pure soil samples, the hydrates essentially influenced the mechanical behaviour of the hydrate-bearing soil samples, and the behaviours varied due to the different hydrate growth patterns. The behaviour with elongated soil particles is much closer to that of the natural hydrate-bearing sandy sediments retrieved from the Nankai Trough than the behaviour with spherical particles. The observed macroscopic strength behaviour is also explained by the microscopic contact-type related contributions (soil-soil contact, soil-hydrate contact and hydrate-hydrate contact) to the deviatoric stresses.

Type: Article
Title: Discrete element modelling of methane hydrate soil sediments using elongated soil particles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.compgeo.2016.03.004
Publisher version: http://dx.doi.org/10.1016/j.compgeo.2016.03.004
Language: English
Additional information: Copyright © 2016 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/). The published version is available on the journal website at http://dx.doi.org/10.1016/j.compgeo.2016.03.004
Keywords: Methane hydrate; Soil; DEM; Saturation; Particle shape; Anisotropy
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1478379
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