Please use this identifier to cite or link to this item:
Title: Strain rate-dependent hardening-softening characteristics of gas hydrate-Bearing sediments
Authors: Deusner, C
Gupta, S
Xie, XG 
Leung, YF 
Uchida, S
Kossel, E
Haeckel, M
Keywords: Gas hydrate-bearing sediments
High-pressure studies
THCM modelling
Slope stability
Gas seeps
Issue Date: 2019
Publisher: Wiley published on behalf of American Geophysical Union
Source: Geochemistry geophysics geosystems, 2019 , v. 20, no. 11, p. 4885-4905 How to cite?
Journal: Geochemistry geophysics geosystems 
Abstract: The presence of gas hydrates (GHs) increases the stiffness and strength of marine sediments. In elasto-plastic constitutive models, it is common to consider GH saturation (S-h) as key internal variable for defining the contribution of GHs to composite soil mechanical behavior. However, the stress-strain behavior of GH-bearing sediments (GHBS) also depends on the microscale distribution of GH and on GH-sediment fabrics. A thorough analysis of GHBS is difficult, because there is no unique relation between S-h and GH morphology. To improve the understanding of stress-strain behavior of GHBS in terms of established soil models, this study summarizes results from triaxial compression tests with different S-h, pore fluids, effective confining stresses, and strain histories. Our data indicate that the mechanical behavior of GHBS strongly depends on S-h and GH morphology, and also on the strain-induced alteration of GH-sediment fabrics. Hardening-softening characteristics of GHBS are strain rate-dependent, which suggests that GH-sediment fabrics dynamically rearrange during plastic yielding events. We hypothesize that rearrangement of GH-sediment fabrics, through viscous deformation or transient dissociation and reformation of GHs, results in kinematic hardening, suppressed softening, and secondary strength recovery, which could potentially mitigate or counteract large-strain failure events. For constitutive modeling approaches, we suggest that strain rate-dependent micromechanical effects from alterations of the GH-sediment fabrics can be lumped into a nonconstant residual friction parameter. We propose simple empirical evolution functions for the mechanical properties and calibrate the model parameters against the experimental data.
EISSN: 1525-2027
DOI: 10.1029/2019GC008458
Rights: ©2019. The Authors.
This is an open access article under theterms of the Creative Commons Attribution License (, which permits use,distribution and reproduction in anymedium, provided the original work isproperly cited.
The following publication Deusner, C., Gupta, S., Xie, X.‐G.,Leung, Y. F., Uchida, S., Kossel, E., & Haeckel, M. (2019). Strainrate‐dependent hardening‐softeningcharacteristics of gas hydrate‐bearingsediments. Geochemistry, Geophysics, Geosystems, 20 (11), 4885–4905 is available at
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Deusner_Strain_Rate-Dependent_Hardening-Softening.pdf14.89 MBAdobe PDFView/Open
View full-text via PolyU eLinks SFX Query
Show full item record
PIRA download icon_1.1View/Download Contents

Page view(s)

Citations as of Feb 19, 2020


Citations as of Feb 19, 2020

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.