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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
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
Indexed BySCI ; EI ; CSCD
WOS IDWOS:000428923700004
WOS Research AreaEngineering, Mechanical ; Mechanics
WOS SubjectEngineering ; Mechanics
Funding OrganizationNational Natural Science Foundation of China [41376078, 51639008, 51239010] ; China Geological Survey [DD20160216] ; Youth Innovation Promotion Association of Chinese Academy of Sciences [2017027]
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.[Zhang, X. H.
2.Luo, D. S.
3.Lu, X. B.] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
4.[Zhang, X. H.
5.Lu, X. B.] Univ Chinese Acad Sci, Coll Engn, Beijing 100049, Peoples R China
6.[Liu, L. L.
7.Liu, C. L.] Minist Land & Resources, Key Lab Gas Hydrate, Qingdao 266071, Peoples R China
8.[Liu, L. L.
9.Liu, C. L.] Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Zhang XH,Luo DS,Lu XB,et al. Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation[J]. ACTA MECHANICA SINICA,2018,34(2):266-274.
APA 张旭辉,罗大双,鲁晓兵,刘乐乐,&Liu CL.(2018).Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation.ACTA MECHANICA SINICA,34(2),266-274.
MLA 张旭辉,et al."Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation".ACTA MECHANICA SINICA 34.2(2018):266-274.
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