CUED Publications database

Study on small-strain behaviours of methane hydrate sandy sediments using discrete element method

Yu, Y and Xu, X and Cheng, YP and Soga, K (2013) Study on small-strain behaviours of methane hydrate sandy sediments using discrete element method. In: UNSPECIFIED pp. 555-558..

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Abstract

Methane hydrate bearing soil has attracted increasing interest as a potential energy resource where methane gas can be extracted from dissociating hydrate-bearing sediments. Seismic testing techniques have been applied extensively and in various ways, to detect the presence of hydrates, due to the fact that hydrates increase the stiffness of hydrate-bearing sediments. With the recognition of the limitations of laboratory and field tests, wave propagation modelling using Discrete Element Method (DEM) was conducted in this study in order to provide some particle-scale insights on the hydrate-bearing sandy sediment models with pore-filling and cementation hydrate distributions. The relationship between shear wave velocity and hydrate saturation was established by both DEM simulations and analytical solutions. Obvious differences were observed in the dependence of wave velocity on hydrate saturation for these two cases. From the shear wave velocity measurement and particle-scale analysis, it was found that the small-strain mechanical properties of hydrate-bearing sandy sediments are governed by both the hydrate distribution patterns and hydrate saturation. © 2013 AIP Publishing LLC.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Uncontrolled Keywords: Cementation Methane hydrate bearing soil Pore-filling Saturation Shear wave velocity Small strain
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:59
Last Modified: 08 Dec 2014 02:18
DOI: 10.1063/1.4811991