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利用研制的天然气水合物沉积物合成与力学性质测试一体化试验设备,以粉细砂土和蒙古砂土作为沉积物骨架,对四氢呋喃(THF)水合物沉积物进行了静动三轴试验,获得了水合物分解前后沉积物样品的应力-应变关系、强度和液化特性,对两种骨架的水合物沉积物的性质进行了对比,同时将水合物分解后的沉积物与对应的饱和土的动三轴试验结果进行了对比。结果表明:水合物沉积物均表现为塑性破坏;围压越大,水合物沉积物强度越高;水合物分解导致沉积物的强度大幅降低;水合物分解后沉积物液化所需的时间较饱和水沉积物缩短。
The developed hydrometallurgical sediment synthesis and mechanical properties testing integrated test equipment, fine sand and Mongolia sand as the sediment skeleton, tetrahydrofuran (THF) hydrate sediments were subjected to a static and dynamic triaxial test obtained The stress-strain relationship, strength and liquefaction characteristics of sediment samples before and after the hydrate dissociation were compared, and the properties of the hydrate sediments of the two skeletons were compared. At the same time, the sediments after the hydrate decomposition and the corresponding saturated soil Triaxial test results were compared. The results show that all the hydrate sediments show plastic failure. The larger the confining pressure is, the higher the hydrate sediment intensity is. The hydrate decomposition leads to a drastic reduction of the sediment intensity. The liquefaction time of the hydrate dissociation is more saturated Water sediment shortens.