Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing Sediments
Studying the mechanical characteristics of hydrate-bearing sediments (HBS) contributes to the comprehensive understanding of the mechanical behavior in environments with natural gas hydrate (NGH) occurrences. Simultaneously, the distribution patterns of hydrates significantly influence the strength,...
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| Format: | Article |
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MDPI AG
2023-12-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/12/1/20 |
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| author | Yujing Jiang Xiaoyu Du Peng Yan Meng Li Hengjie Luan Xianzhuang Ma Yichen Shi |
| author_facet | Yujing Jiang Xiaoyu Du Peng Yan Meng Li Hengjie Luan Xianzhuang Ma Yichen Shi |
| author_sort | Yujing Jiang |
| collection | DOAJ |
| description | Studying the mechanical characteristics of hydrate-bearing sediments (HBS) contributes to the comprehensive understanding of the mechanical behavior in environments with natural gas hydrate (NGH) occurrences. Simultaneously, the distribution patterns of hydrates significantly influence the strength, deformation, and stability of HBS. Therefore, this paper employs particle flow code (PFC) to conduct biaxial discrete element simulations on specimens of HBS with different hydrate distribution patterns, revealing the macroscale–mesoscale mechanical properties, evolution patterns, and destructive mechanisms. The results indicate that the strain-softening behavior of HBS specimens strengthens with the increase in hydrate layer thickness, leading to higher peak strength and <i>E</i><sub>50</sub> values. During the gradual movement of the hydrate layer position (<i>A</i><sub>y</sub>) from both ends to the center of the specimen <i>(A</i><sub>y</sub> = 0.40 mm → <i>A</i><sub>y</sub> = 20 mm), the strain-softening behavior weakens. However, when <i>A</i><sub>y</sub> = 20 mm, the specimen exhibits evident strain-softening behavior again. Moreover, with an increase in the angle between the hydrate layer and the horizontal direction (<i>α</i>) greater than 20°, the peak strength of the specimen increases, while <i>E</i><sub>50</sub> shows an overall decreasing trend. The influence of axial loads on the hydrate layer in specimens varies with α, with larger contact forces and fewer cracks observed for higher <i>α</i> values. |
| first_indexed | 2024-03-08T10:46:23Z |
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| id | doaj.art-84b9b4aa3e8e4eb0af24607c647e711f |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-08T10:46:23Z |
| publishDate | 2023-12-01 |
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| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-84b9b4aa3e8e4eb0af24607c647e711f2024-01-26T17:13:08ZengMDPI AGJournal of Marine Science and Engineering2077-13122023-12-011212010.3390/jmse12010020Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing SedimentsYujing Jiang0Xiaoyu Du1Peng Yan2Meng Li3Hengjie Luan4Xianzhuang Ma5Yichen Shi6State Key Laboratory of Production Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Production Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Production Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaChina Minmetals Corporation, Jinan 271100, ChinaState Key Laboratory of Production Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaGraduate School of Engineering, Nagasaki University, Nagasaki 852-8521, JapanState Key Laboratory of Production Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaStudying the mechanical characteristics of hydrate-bearing sediments (HBS) contributes to the comprehensive understanding of the mechanical behavior in environments with natural gas hydrate (NGH) occurrences. Simultaneously, the distribution patterns of hydrates significantly influence the strength, deformation, and stability of HBS. Therefore, this paper employs particle flow code (PFC) to conduct biaxial discrete element simulations on specimens of HBS with different hydrate distribution patterns, revealing the macroscale–mesoscale mechanical properties, evolution patterns, and destructive mechanisms. The results indicate that the strain-softening behavior of HBS specimens strengthens with the increase in hydrate layer thickness, leading to higher peak strength and <i>E</i><sub>50</sub> values. During the gradual movement of the hydrate layer position (<i>A</i><sub>y</sub>) from both ends to the center of the specimen <i>(A</i><sub>y</sub> = 0.40 mm → <i>A</i><sub>y</sub> = 20 mm), the strain-softening behavior weakens. However, when <i>A</i><sub>y</sub> = 20 mm, the specimen exhibits evident strain-softening behavior again. Moreover, with an increase in the angle between the hydrate layer and the horizontal direction (<i>α</i>) greater than 20°, the peak strength of the specimen increases, while <i>E</i><sub>50</sub> shows an overall decreasing trend. The influence of axial loads on the hydrate layer in specimens varies with α, with larger contact forces and fewer cracks observed for higher <i>α</i> values.https://www.mdpi.com/2077-1312/12/1/20natural gas hydratedistribution patternsbiaxial sheardiscrete element simulationmechanical properties |
| spellingShingle | Yujing Jiang Xiaoyu Du Peng Yan Meng Li Hengjie Luan Xianzhuang Ma Yichen Shi Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing Sediments Journal of Marine Science and Engineering natural gas hydrate distribution patterns biaxial shear discrete element simulation mechanical properties |
| title | Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing Sediments |
| title_full | Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing Sediments |
| title_fullStr | Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing Sediments |
| title_full_unstemmed | Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing Sediments |
| title_short | Influence of Natural Gas Hydrate Distribution Patterns on the Macroscale–Mesoscale Mechanical Properties of Hydrate-Bearing Sediments |
| title_sort | influence of natural gas hydrate distribution patterns on the macroscale mesoscale mechanical properties of hydrate bearing sediments |
| topic | natural gas hydrate distribution patterns biaxial shear discrete element simulation mechanical properties |
| url | https://www.mdpi.com/2077-1312/12/1/20 |
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