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Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation
Zhang XH(张旭辉); Luo DS(罗大双); Lu XB(鲁晓兵); Liu LL(刘乐乐); Liu CL
Source PublicationACTA MECHANICA SINICA
2018-04-01
Volume34Issue:2Pages:266-274
ISSN0567-7718
AbstractThe changes in the mechanical properties of gas hydrate-bearing sediments (GHBS) induced by gas hydrate (GH) dissociation are essential to the evaluation of GH exploration and stratum instabilities. Previous studies present substantial mechanical data and constitutive models for GHBS at a given GH saturation under the non-dissociated condition. In this paper, GHBS was formed by the gas saturated method, GH was dissociated by depressurization until the GH saturation reached different dissociation degrees. The stress-strain curves were measured using triaxial tests at a same pore gas pressure and different confining pressures. The results show that the shear strength decreases progressively by 30%-90% of the initial value with GH dissociation, and the modulus decreases by 50% -75%. Simplified relationships for the modulus, cohesion, and internal friction angle with GH dissociated saturation were presented.
KeywordGas hydrate-bearing sediments Dissociation Mechanical properties Shear strength Triaxial test
DOI10.1007/s10409-017-0699-y
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Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000428923700004
WOS KeywordMETHANE-HYDRATE ; STRENGTH ; BEHAVIOR ; MODEL ; SAND
WOS Research AreaEngineering, Mechanical ; Mechanics
WOS SubjectEngineering ; Mechanics