Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil
In this paper, the methane hydrate phase transition process in deep-sea methane hydrate-bearing soil under heating and compression was simulated by the molecular dynamics method. The evolution of deep-sea methane hydrate-bearing soil’s microstructure, system energy, intermolecular interaction energy...
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ftdoajarticles:oai:doaj.org/article:d8c1d2ca39c64e2b8fc9201ff17b6d52 2024-09-15T18:18:30+00:00 Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil Yanmei Zhang Jian Zhang Guoxun Li Changda Sun Yalin Luan Jianlin Liu 2021-01-01T00:00:00Z https://doi.org/10.1155/2021/3716891 https://doaj.org/article/d8c1d2ca39c64e2b8fc9201ff17b6d52 EN eng Wiley http://dx.doi.org/10.1155/2021/3716891 https://doaj.org/toc/1687-8094 1687-8094 doi:10.1155/2021/3716891 https://doaj.org/article/d8c1d2ca39c64e2b8fc9201ff17b6d52 Advances in Civil Engineering, Vol 2021 (2021) Engineering (General). Civil engineering (General) TA1-2040 article 2021 ftdoajarticles https://doi.org/10.1155/2021/3716891 2024-08-05T17:48:44Z In this paper, the methane hydrate phase transition process in deep-sea methane hydrate-bearing soil under heating and compression was simulated by the molecular dynamics method. The evolution of deep-sea methane hydrate-bearing soil’s microstructure, system energy, intermolecular interaction energy, and radial distribution function during heating and compression was investigated. The micromechanism of the influence of the methane hydrate phase transition on the mechanical properties of deep-sea methane hydrate-bearing soil was analyzed. The results demonstrated that the methane hydrate dissociation starts from both sides to the middle and the void spaces between the soil particles had nearly no change during the heating process. For the compression process, the methane hydrate on both sides and the middle dissociated at the same time, and the void spaces became smaller. The methane hydrate phase transition on the effects of mechanical properties of the deep-sea methane hydrate-bearing soil is mainly caused by three aspects. (1) the dissociation of methane hydrate incurs the decrease of methane hydrate saturation. The free water and methane molecules generated cannot migrate in time and thus lead to the increase of excess pore water press and excess pore gas press. (2) The dissipated energy causes the decrease of the effective stress between the soil particles. (3) Due to the methane hydrate decomposition, the free water molecules increase, which reduces the friction of soil particles. Article in Journal/Newspaper Methane hydrate Directory of Open Access Journals: DOAJ Articles Advances in Civil Engineering 2021 1 10 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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topic |
Engineering (General). Civil engineering (General) TA1-2040 |
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Engineering (General). Civil engineering (General) TA1-2040 Yanmei Zhang Jian Zhang Guoxun Li Changda Sun Yalin Luan Jianlin Liu Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil |
topic_facet |
Engineering (General). Civil engineering (General) TA1-2040 |
description |
In this paper, the methane hydrate phase transition process in deep-sea methane hydrate-bearing soil under heating and compression was simulated by the molecular dynamics method. The evolution of deep-sea methane hydrate-bearing soil’s microstructure, system energy, intermolecular interaction energy, and radial distribution function during heating and compression was investigated. The micromechanism of the influence of the methane hydrate phase transition on the mechanical properties of deep-sea methane hydrate-bearing soil was analyzed. The results demonstrated that the methane hydrate dissociation starts from both sides to the middle and the void spaces between the soil particles had nearly no change during the heating process. For the compression process, the methane hydrate on both sides and the middle dissociated at the same time, and the void spaces became smaller. The methane hydrate phase transition on the effects of mechanical properties of the deep-sea methane hydrate-bearing soil is mainly caused by three aspects. (1) the dissociation of methane hydrate incurs the decrease of methane hydrate saturation. The free water and methane molecules generated cannot migrate in time and thus lead to the increase of excess pore water press and excess pore gas press. (2) The dissipated energy causes the decrease of the effective stress between the soil particles. (3) Due to the methane hydrate decomposition, the free water molecules increase, which reduces the friction of soil particles. |
format |
Article in Journal/Newspaper |
author |
Yanmei Zhang Jian Zhang Guoxun Li Changda Sun Yalin Luan Jianlin Liu |
author_facet |
Yanmei Zhang Jian Zhang Guoxun Li Changda Sun Yalin Luan Jianlin Liu |
author_sort |
Yanmei Zhang |
title |
Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil |
title_short |
Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil |
title_full |
Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil |
title_fullStr |
Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil |
title_full_unstemmed |
Molecular Dynamics Simulation of the Effects of Methane Hydrate Phase Transition on Mechanical Properties of Deep-Sea Methane Hydrate-Bearing Soil |
title_sort |
molecular dynamics simulation of the effects of methane hydrate phase transition on mechanical properties of deep-sea methane hydrate-bearing soil |
publisher |
Wiley |
publishDate |
2021 |
url |
https://doi.org/10.1155/2021/3716891 https://doaj.org/article/d8c1d2ca39c64e2b8fc9201ff17b6d52 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Advances in Civil Engineering, Vol 2021 (2021) |
op_relation |
http://dx.doi.org/10.1155/2021/3716891 https://doaj.org/toc/1687-8094 1687-8094 doi:10.1155/2021/3716891 https://doaj.org/article/d8c1d2ca39c64e2b8fc9201ff17b6d52 |
op_doi |
https://doi.org/10.1155/2021/3716891 |
container_title |
Advances in Civil Engineering |
container_volume |
2021 |
container_start_page |
1 |
op_container_end_page |
10 |
_version_ |
1810456625088036864 |