Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment

The occurrence of a shear band is often thought as the precursor of failure. To study the initiation of shear banding in gas hydrate-bearing sediments, two groups of triaxial compression tests combined with a CT (computer tomography) scan were conducted by triaxial CT-integrated equipment under two...

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Autores principales:	Xiaobing Lu, Xuhui Zhang, Fangfang Sun, Shuyun Wang, Lele Liu, Changling Liu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hydrate-bearing sediment shear band hydrate saturation triaxial compression CT scanning Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/723e753c321146e8b8598542dbc6c5c8
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spelling	oai:doaj.org-article:723e753c321146e8b8598542dbc6c5c82021-11-25T18:03:42ZExperimental Study on the Shear Band of Methane Hydrate-Bearing Sediment10.3390/jmse91111582077-1312https://doaj.org/article/723e753c321146e8b8598542dbc6c5c82021-10-01T00:00:00Zhttps://www.mdpi.com/2077-1312/9/11/1158https://doaj.org/toc/2077-1312The occurrence of a shear band is often thought as the precursor of failure. To study the initiation of shear banding in gas hydrate-bearing sediments, two groups of triaxial compression tests combined with a CT (computer tomography) scan were conducted by triaxial CT-integrated equipment under two confining pressures and seven hydrate saturations. The macro stress–strain curves and the corresponding CT scanning images of the micro-structure and the distribution of the components were obtained. The geometric parameters of the shear bands were measured based on the CT images at four typical axial strains, respectively. The distribution characteristics of soil particles, water, hydrate and gas were also analyzed. It is shown that the existence of methane hydrate changes the mechanical property of hydrate-bearing sediment from plastic failure to brittle failure when the hydrate saturation is over 13%, which occurs in the range of the tests in this paper. The peak of the deviatoric stress increases with the hydrate saturation. The shear band is in either a single oblique line or inter-cross lines depending on the hydrate saturation, the effective confining pressure and the initial distribution of the gas hydrate. Most of the shear band surfaces are not straight, and the widths of the shear bands are almost non-uniformly distributed.Xiaobing LuXuhui ZhangFangfang SunShuyun WangLele LiuChangling LiuMDPI AGarticlehydrate-bearing sedimentshear bandhydrate saturationtriaxial compressionCT scanningNaval architecture. Shipbuilding. Marine engineeringVM1-989OceanographyGC1-1581ENJournal of Marine Science and Engineering, Vol 9, Iss 1158, p 1158 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrate-bearing sediment shear band hydrate saturation triaxial compression CT scanning Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
spellingShingle	hydrate-bearing sediment shear band hydrate saturation triaxial compression CT scanning Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Xiaobing Lu Xuhui Zhang Fangfang Sun Shuyun Wang Lele Liu Changling Liu Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment
description	The occurrence of a shear band is often thought as the precursor of failure. To study the initiation of shear banding in gas hydrate-bearing sediments, two groups of triaxial compression tests combined with a CT (computer tomography) scan were conducted by triaxial CT-integrated equipment under two confining pressures and seven hydrate saturations. The macro stress–strain curves and the corresponding CT scanning images of the micro-structure and the distribution of the components were obtained. The geometric parameters of the shear bands were measured based on the CT images at four typical axial strains, respectively. The distribution characteristics of soil particles, water, hydrate and gas were also analyzed. It is shown that the existence of methane hydrate changes the mechanical property of hydrate-bearing sediment from plastic failure to brittle failure when the hydrate saturation is over 13%, which occurs in the range of the tests in this paper. The peak of the deviatoric stress increases with the hydrate saturation. The shear band is in either a single oblique line or inter-cross lines depending on the hydrate saturation, the effective confining pressure and the initial distribution of the gas hydrate. Most of the shear band surfaces are not straight, and the widths of the shear bands are almost non-uniformly distributed.
format	article
author	Xiaobing Lu Xuhui Zhang Fangfang Sun Shuyun Wang Lele Liu Changling Liu
author_facet	Xiaobing Lu Xuhui Zhang Fangfang Sun Shuyun Wang Lele Liu Changling Liu
author_sort	Xiaobing Lu
title	Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment
title_short	Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment
title_full	Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment
title_fullStr	Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment
title_full_unstemmed	Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment
title_sort	experimental study on the shear band of methane hydrate-bearing sediment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/723e753c321146e8b8598542dbc6c5c8
work_keys_str_mv	AT xiaobinglu experimentalstudyontheshearbandofmethanehydratebearingsediment AT xuhuizhang experimentalstudyontheshearbandofmethanehydratebearingsediment AT fangfangsun experimentalstudyontheshearbandofmethanehydratebearingsediment AT shuyunwang experimentalstudyontheshearbandofmethanehydratebearingsediment AT leleliu experimentalstudyontheshearbandofmethanehydratebearingsediment AT changlingliu experimentalstudyontheshearbandofmethanehydratebearingsediment
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Experimental Study on the Shear Band of Methane Hydrate-Bearing Sediment

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