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