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Effect of temperature cycle on mechanical properties of methane hydrate-bearing sediment

机译：温度循环对甲烷水合物沉积物力学性能的影响

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In this study, methane hydrate-bearing sand (MHBS) was created in the laboratory following two methods in order to obtain two types of gas hydrate morphology in sandy sediment. The hydrate morphology in the sediment was assessed by measuring the compressional wave velocity combined with models to predict the wave velocities of the sediment containing gas hydrates. The mechanical properties of the MHBS were investigated by triaxial compression tests. The results obtained by the compressional wave velocity show that after saturating the MHBS sediment (created by the excess gas method) with water, the methane hydrates are partly or completely converted from grain contacts to pore spaces depending on the hydrate saturation (ranging from 0 to 50%). A subsequent temperature cycle completes this conversion process for high hydrate saturation. The results obtained with the triaxial compression tests show higher shear strength, a higher secant Young's modulus, and a higher dilation angle at higher hydrate saturation. In addition, the effects of hydrate saturation on the mechanical properties of the MHBS obtained by the two procedures (with and without the thermal cycle) are similar at low hydrate saturation. The effect of gas hydrate morphologies can only be detected in the case where the conversion (and/or redistribution) of gas hydrates from grain contacts to pore spaces is not complete (at high hydrate saturation). (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：在这项研究中，实验室中采用两种方法创建了含甲烷水合物的砂（MHBS），以便在砂质沉积物中获得两种类型的天然气水合物形态。沉积物中的水合物形态是通过测量压缩波速度并结合模型来预测含天然气水合物的沉积物的波速来评估的。通过三轴压缩试验研究了MHBS的机械性能。压缩波速度获得的结果表明，用水使MHBS沉积物（通过过量气体法产生）饱和后，甲烷水合物会根据水合物的饱和度（范围从0到0）从颗粒接触部分或完全转化为孔隙空间50％）。随后的温度循环完成了该转化过程，以实现高水合物饱和度。通过三轴压缩试验获得的结果表明，在较高的水合物饱和度下，较高的剪切强度，较高的割线杨氏模量和较高的膨胀角。另外，在低水合物饱和度下，水合物饱和度对通过两种方法获得的MHBS力学性能的影响（有或没有热循环）相似。仅在气体水合物从晶粒接触到孔隙空间的转化（和/或再分布）不完全（在高水合物饱和度下）的情况下，才能检测到气体水合物形态的影响。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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