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Investigation into the effect of backpressure on the mechanical behavior of methane-hydrate-bearing sediments via DEM analyses
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Jiang, Mingjing, Zhu, Fangyuan and Utili, Stefano (2015) Investigation into the effect of backpressure on the mechanical behavior of methane-hydrate-bearing sediments via DEM analyses. Computers and geotechnics, 69 . pp. 551-563. doi:10.1016/j.compgeo.2015.06.019
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Official URL: http://dx.doi.org/10.1016/j.compgeo.2015.06.019
Abstract
Backpressure has been extensively applied in experimental tests to improve the water saturation of samples, and its effect on the strength of saturated soils has been traditionally regarded as trivial in Soil Mechanics. However, a non-negligible influence of backpressure on the macro mechanical properties of methane-hydrate-bearing-sediments (MHBS) has been surprisingly observed in several recent experiments reported in the literature. This paper aims to shed light on this phenomenon. A theoretical analysis on the microscopic interaction between soil grains and inter-particle methane hydrate (MH) was carried out to highlight how backpressure affects the mechanical properties of the inter-particle MH which in turn affect the macroscopic mechanical behavior of MHBS. The influence of backpressure is accounted for in a new bond contact model implemented into the Distinct Element Method (DEM). Then, a series of DEM biaxial compression tests were run to investigate the link between mechanical properties of MHBS and backpressure. The DEM numerical results show that shear strength, small strain stiffness and shear dilation of MHBS increase with the level of backpressure. As the critical state is approached, the influence of backpressure ceases. Moreover, the elastic modulus and cohesion of MHBS increase linearly while the internal friction angle decreases at a decreasing rate as the backpressure increases. Simple analytical relationships were achieved so that the effect of backpressure on the mechanical properties of MHBS can be accounted in the design of laboratory tests to characterize the mechanical behavior of MHBS.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||||||||
| Divisions: | Faculty of Science > Engineering | ||||||||||
| Library of Congress Subject Headings (LCSH): | Natural gas -- Hydrates, Sediments (Geology) -- Mechanical properties, Soil mechanics | ||||||||||
| Journal or Publication Title: | Computers and geotechnics | ||||||||||
| Publisher: | Elsevier BV | ||||||||||
| ISSN: | 0266-352X | ||||||||||
| Official Date: | September 2015 | ||||||||||
| Dates: |
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| Date of first compliant deposit: | 30 December 2015 | ||||||||||
| Volume: | 69 | ||||||||||
| Number of Pages: | 13 | ||||||||||
| Page Range: | pp. 551-563 | ||||||||||
| DOI: | 10.1016/j.compgeo.2015.06.019 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Funder: | Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), Marie Skłodowska-Curie actions, Tong ji da xue (China) [Tongji University] | ||||||||||
| Grant number: | 51025932 (NSFC), 294976 (MSCa), SLDRCE14-A-04 |
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