Experimental study on mechanical properties of clay sediment containing tetrahydroguran hydrate

• Main Authors: 王淑云, 鲁晓兵, 张旭辉
• Format: Other/Unknown Material
• Language: English
• Published: 2018
• Subjects: Arctic engineering; Compression testing; Failure (mechanical); Hydrates; Hydration; Mechanical properties; Strain hardening; Stress; strain curves; Clay sediments; Confining pressures; Hydrate dissociation; Hydrate saturation; Strength; Stress strain; Tetrahydrofuran hydrate; Undrained shear strength; Arctic
• Online Access: http://dspace.imech.ac.cn/handle/311007/78006

Based on remolded clay sediment obtained from a certain area in the South China Sea, a series of tri-axial unconsolidated untrained compression tests on clay sediment containing tetrahydrofuran hydrate were performed under the conditions of different hydrate saturation and confining pressure. The stress-strain curve of clay sediment containing hydrate consists of three stages: elastic (when strain is less than 1.5%), plastic (when strain is between 2% and 6%) and strain hardening (when strain is greater than 6%) stage, and very different from that of clay sediment which behaves only plastic failure. Moreover, the undrained shear strength of clay sediment containing hydrate increases about 1~7 times than that of clay sediment and decreases by 50% after hydrate dissociation. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)