Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples
Studying the strength and deformation properties of sediments containing gas hydrates is one of the key problems during the process of hydrate resource exploitation. In this paper, considering the effects of temperatures (−5, −3, −1 °C), confining pressures (0....
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MDPI AG
2019-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/22/4277 |
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| author | Xudong Zhang Yiming Zhu Zhanfeng Ying Tingting Luo |
| author_facet | Xudong Zhang Yiming Zhu Zhanfeng Ying Tingting Luo |
| author_sort | Xudong Zhang |
| collection | DOAJ |
| description | Studying the strength and deformation properties of sediments containing gas hydrates is one of the key problems during the process of hydrate resource exploitation. In this paper, considering the effects of temperatures (−5, −3, −1 °C), confining pressures (0.5, 1, 2 MPa) and porosities (40%, 80%) on the dynamic modulus characteristics of sediments containing methane hydrates, several dynamic loading experiments were conducted. The results show that the sediment structure was more easily destroyed under a larger amplitude of dynamic loading. According to the dynamic stress−strain curves, the skeleton curves of the sediment samples were obtained, and it was shown that the deformation behaved with elastic characteristics in the initial stage, and then plastic deformation increased gradually and played a leading role with the increase in external loading. The maximum dynamic elastic modulus of sediments was reduced under the conditions of higher temperature and porosity, and effectively enhanced under higher confining pressure. Finally, on the basis of the Hardin−Drnevich equivalent model, and considering the influences of temperatures and confining pressures on model parameters, a viscoelastic constitutive model applied to analyze the dynamic modulus characteristics of sediments containing methane hydrate was established. The comparison showed that these calculated values of sediments’ dynamic elastic modulus accorded quite well with the experimental values. |
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| format | Article |
| id | doaj.art-6ce7fc0d3db4463e903e5b8ba3bbafca |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-12T19:55:40Z |
| publishDate | 2019-11-01 |
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| series | Energies |
| spelling | doaj.art-6ce7fc0d3db4463e903e5b8ba3bbafca2022-12-22T03:18:41ZengMDPI AGEnergies1996-10732019-11-011222427710.3390/en12224277en12224277Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment SamplesXudong Zhang0Yiming Zhu1Zhanfeng Ying2Tingting Luo3School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaKey Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaStudying the strength and deformation properties of sediments containing gas hydrates is one of the key problems during the process of hydrate resource exploitation. In this paper, considering the effects of temperatures (−5, −3, −1 °C), confining pressures (0.5, 1, 2 MPa) and porosities (40%, 80%) on the dynamic modulus characteristics of sediments containing methane hydrates, several dynamic loading experiments were conducted. The results show that the sediment structure was more easily destroyed under a larger amplitude of dynamic loading. According to the dynamic stress−strain curves, the skeleton curves of the sediment samples were obtained, and it was shown that the deformation behaved with elastic characteristics in the initial stage, and then plastic deformation increased gradually and played a leading role with the increase in external loading. The maximum dynamic elastic modulus of sediments was reduced under the conditions of higher temperature and porosity, and effectively enhanced under higher confining pressure. Finally, on the basis of the Hardin−Drnevich equivalent model, and considering the influences of temperatures and confining pressures on model parameters, a viscoelastic constitutive model applied to analyze the dynamic modulus characteristics of sediments containing methane hydrate was established. The comparison showed that these calculated values of sediments’ dynamic elastic modulus accorded quite well with the experimental values.https://www.mdpi.com/1996-1073/12/22/4277methane hydrate-bearing sedimentsstress–strain relationshipskeleton curvedynamic modulusconstitutive model |
| spellingShingle | Xudong Zhang Yiming Zhu Zhanfeng Ying Tingting Luo Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples Energies methane hydrate-bearing sediments stress–strain relationship skeleton curve dynamic modulus constitutive model |
| title | Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples |
| title_full | Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples |
| title_fullStr | Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples |
| title_full_unstemmed | Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples |
| title_short | Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples |
| title_sort | experimental investigation on the dynamic modulus properties of methane hydrate sediment samples |
| topic | methane hydrate-bearing sediments stress–strain relationship skeleton curve dynamic modulus constitutive model |
| url | https://www.mdpi.com/1996-1073/12/22/4277 |
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