Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea
Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea
复制标题
南海含水饱和甲烷水合物粘土粉砂质沉积物不排水三轴试验
DOI：
10.1139/cgj-2019-0711
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发表时间：
2020-05
影响因子：
3.6
通讯作者：
Yanghui Li
中科院分区：
文献类型：
--
作者：
Lei Wang;Xiang Sun;Shi Shen;Peng Wu;Tao Liu;Weiguo Liu;Jiafei Zhao;Yanghui Li
大约90%的天然气水合物埋藏在细粒沉积物中，特别是在南中国海。水合物分解引起的细粒沉积物的潜在不稳定性要求研究水合物开采过程中沉积物的抗剪强度和孔隙压力响应。迄今为止，大多数研究都集中在含天然气水合物的砂或不含天然气水合物的粘土的不排水力学行为-很少有研究检查含天然气水合物的细粒沉积物。针对南海沉积物的低渗透性和饱水特性，对该海域含甲烷水合物的粘土-粉砂质沉积物进行了一系列饱水三轴不排水剪切试验。实验结果表明，含甲烷水合物沉积物的破坏强度随水合物饱和度和初始有效平均应力的增大而增大。在剪切过程中，MHBSs的超孔隙水压力保持为正。Mohr-Coulomb模型中的内聚力随水合物饱和度的增加而增加，而Mohr-Coulomb模型中的内摩擦角对水合物饱和度的依赖性很小。
Approximately 90% of gas hydrates are buried in fine-grained sediments, especially in the South China Sea. The potential instability of fine-grained sediments induced by hydrate dissociation requires investigation of the shear strength and pore pressure response of sediments during hydrate recovery. To date, most studies have focused on the undrained mechanical behavior of gas hydrate–bearing sand or gas hydrate–free clay — few studies have examined gas hydrate–bearing fine-grained sediments. Because of the low-permeability and water-saturated characteristics of the sediments in the South China Sea, a series of undrained triaxial shear tests were performed on water-saturated methane hydrate-bearing clayey–silty sediments in this area. The experimental results show that the failure strength of methane hydrate–bearing sediments (MHBSs) increases with the increase in hydrate saturation and initial effective mean stress. The excess pore-water pressure of MHBSs remains positive during shear. Cohesion in the Mohr–Coulomb model increases with the increase in hydrate saturation, while the internal friction angle in the Mohr–Coulomb model has little dependence on the hydrate saturation.
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作者：
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DOI：
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DOI：
10.4028/www.scientific.net/amm.275-277.326
发表时间：
2013-01
期刊：
Applied Mechanics and Materials
影响因子：
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作者：
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DOI：
10.5860/choice.34-0331
发表时间：
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