›› 2011, Vol. 32 ›› Issue (S1): 303-0308.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of static and dynamic properties of tetrahydrofuran hydrate-bearing sediments

ZHANG Xu-hui1, LU Xiao-bing1, WANG Shu-yun1, LI Qing-ping2   

  1. 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; 2. Research Centre, China Ocean Oil Co., Beijing 100027, China
  • Received:2010-12-07 Online:2011-05-15 Published:2011-05-16

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Abstract: By using the integrated experimental apparatus for syntheses of gas hydrate sediment and triaxial tests, a series of static and dynamic tests are conducted on the tetrahydrofuran (THF) hydrate with fine sand and Mongolia sand as the skeleton. The stress-strain curves, strength and liquefaction characteristics of the sediments before and after hydrate dissociation are obtained. The mechanical properties of the two kinds of hydrate sediments with fine sand and Mongolia sand as the skeleton, as well as the liquefaction characteristics of the sediment after dissociation of hydrate and the corresponding saturated sand are compared. It is shown that the hydrate-bearing sediments all behave as plastic failure, strength of which the increases with the formation of hydrate and the confining pressure. The dissociation of hydrate can lead to the great decrease of the strength of the sediments. The liquefaction of the sediment after dissociation of hydrate needs shorter time relative to the corresponding saturated sand

Key words: hydrate-bearing sediments, stress-strain relationship, shear strength, liquefaction

CLC Number: 

  • TU 411
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