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A hypoplastic model for gas hydrate‐bearing sandy sediments
Author(s) -
Zhang Xuhui,
Lin Jia,
Lu Xiaobing,
Liu Lele,
Liu Changling,
Li Mingyao,
Su Yewang
Publication year - 2018
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.2772
Subject(s) - hydrate , geotechnical engineering , softening , saturation (graph theory) , porosity , clathrate hydrate , strain hardening exponent , hardening (computing) , materials science , geology , mineralogy , composite material , chemistry , mathematics , organic chemistry , layer (electronics) , combinatorics
Summary Gas hydrate‐bearing sediments (GHBSs) have been considered as a potential energy resource. In this paper, the mechanical properties of GHBS are firstly investigated by the integrated test apparatus for synthesis of GHBS using silty sand as skeleton. Triaxial tests indicate an obvious transition of stress‐strain relationship from strain hardening under low hydrate saturation and strain softening under high hydrate saturation. The hypoplastic models coupled with Drucker‐Prager criterion and the Mohr‐Coulomb criterion are proposed to analyze the stress‐strain relationship of GHBS with considering the effective porosity because of the hydrate filling in the pores of GHBS. The strain hardening and softening behaviors are well predicted with less material parameters compared with the classical models. Compared with the test results, the proposed hypoplastic models are verified to be capable of capturing the salient features of the mechanical behaviors of GHBS under the conditions of little temperature change and no hydrate dissociation.