Li Yanghui, Wu Peng, Sun Xiang, Liu Weiguo, Song Yongchen
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, 116024, P. R. China.
iScience. 2021 Apr 16;24(5):102448. doi: 10.1016/j.isci.2021.102448. eCollection 2021 May 21.
Unlike the conceptual models, the natural hydrate spatial distribution in sediments is multitype and presents different coalescence degrees. In this study, we present pore-scale triaxial test results for hydrate-bearing sediments with different hydrate spatial distributions for the first time. It shows that the specimen with a more dispersed hydrate distribution yields later and exhibits larger peak strength. Correspondingly, the localized deformation develops more slowly, and the shear band is steeper and thinner. The cementation failure in the specimen with a more dispersed hydrate distribution develops more slowly. However, the changing rate of the pore space characteristic does not seem to be affected by the hydrate spatial distribution. Moreover, the specimen with a more dispersed hydrate distribution has a larger hydrate-sand interfacial area, and further axial loading would increase it rapidly firstly, and then the increasing rate would be slowed down since the cementation structure failure.
与概念模型不同，沉积物中天然水合物的空间分布具有多种类型，并呈现出不同的胶结程度。在本研究中，我们首次给出了具有不同水合物空间分布的含天然气水合物沉积物的孔隙尺度三轴试验结果。结果表明，水合物分布较为分散的试样屈服较晚，峰值强度较大。相应地，局部变形发展较慢，剪切带更陡、更薄。水合物分布较为分散的试样中的胶结破坏发展较慢。然而，孔隙空间特征的变化率似乎不受水合物空间分布的影响。此外，水合物分布较为分散的试样具有更大的水合物 - 砂界面面积，进一步的轴向加载首先会使其迅速增加，然后由于胶结结构破坏，增加速率会减慢。
Zotero 插件
