气候变化领域集成服务门户(CCPortal): Cementation Failure Behavior of Consolidated Gas Hydrate-Bearing Sand

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DOI	10.1029/2019JB018623
	Cementation Failure Behavior of Consolidated Gas Hydrate-Bearing Sand
	Wu P.; Li Y.; Liu W.; Sun X.; Kong X.; Song Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	The macromechanical properties (strength, stiffness, stress-strain relationship, etc) of the hydrate-bearing sediment are often correlated with the hydrate cementation failure behavior. In this study, a consolidated drained triaxial shear test with X-ray computed tomography was conducted on a hydrate-bearing sediment with a hydrate saturation of 32.1% under 3 MPa effective confining pressure for revealing the cementation failure behavior. The hydrate occurrences were clearly identified to be cementing, grain-coating, prepatchy cluster and patchy cluster. The cementation failure behavior (morphology), deformation evolution (quantitative statistics), and localized shear deformation at different regions of stress-strain curve were observed and analyzed using computed tomography. In the linearity region, the hydrate-cemented clusters moved as a whole, while small hydrate particles would aggregate to the periphery of the clusters. The noncemented sand particles move disorderly during this process. Localized deformation occurred perfectly exhibit an antisymmetric bifurcation pattern. In the plasticity region, the specimen starts to deform plastically; an internal shear band occurs in the specimen. The hydrates begin to shed from the periphery of the cemented structure, and the grinding effect of hydrates begins to occur between sand particles. However, the shedded hydrates will not enter and fill the neighboring pores but hind the movement of sand particles structurally near the original position. In the yielding region, the hydrate-cemented cluster structure is completely damaged and crushed into small pieces; a shear band with a determined thickness and inclination angle was observed. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188057
作者单位	Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, China; State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China
推荐引用方式 GB/T 7714	Wu P.,Li Y.,Liu W.,et al. Cementation Failure Behavior of Consolidated Gas Hydrate-Bearing Sand[J],2020,125(1).
APA	Wu P.,Li Y.,Liu W.,Sun X.,Kong X.,&Song Y..(2020).Cementation Failure Behavior of Consolidated Gas Hydrate-Bearing Sand.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Wu P.,et al."Cementation Failure Behavior of Consolidated Gas Hydrate-Bearing Sand".Journal of Geophysical Research: Solid Earth 125.1(2020).