Constitutive Model for Gas Hydrate-Bearing Soils Considering Hydrate Occurrence Habits
文献类型：期刊论文
| 作者 | Wei, Changfu2; Yan, Rongtao1 |
| 刊名 | INTERNATIONAL JOURNAL OF GEOMECHANICS
 |
| 出版日期 | 2017 |
| 卷号 | 17期号:8页码:- |
| 关键词 | Gas hydrate-bearing soil (GHBS) Mechanical behavior Constitutive model Bonding effect Hydrate dissociation Occurrence habit |
| ISSN号 | 1532-3641 |
| DOI | 10.1061/(ASCE)GM.1943-5622.0000914 |
| 英文摘要 | To exploit the resource of methane hydrate, it is crucial to understand the mechanical behavior of hydrate-bearing sediments. In this paper an elastoplastic constitutive model is developed for describing the mechanical behavior of gas hydrate-bearing soils (GHBS). To address the effect of the hydrate occurrence habits, the concept of the effective degree of saturation of the gas hydrate is introduced, and the effective stress stresses are redefined for describing the mechanical response of the GHBS. Within this context, a yield or loading function is developed while considering the bonding effect of gas hydrate; thus, the yield function can expand or shrink as gas hydrate forms or dissociates. To describe more realistically the mechanical behavior of the GHBS, a nonassociative flow rule is proposed by assuming the dilatancy to be a function of bonding stresses, suction stress, and stress ratio. The proposed model is applied to analyze the mechanical responses of the GHBS with different hydrate occurrence habits under different environmental loadings. It is demonstrated that the proposed model can well capture the main features of the mechanical behavior of GHBS, including the hydrate-induced enhancements of stiffness, strength and dilatancy, the unsaturation-related characteristics, and the hydrate occurrence habits dependency, showing that the proposed model is capable of describing the mechanical behavior of GHBS due to hydrate dissociation or under other environmental loadings. |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000400166100028 |
| 出版者 | ASCE-AMER SOC CIVIL ENGINEERS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/4102]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.Guilin Univ Technol, Guangxi Key Lab Geomech & Geotech Engn; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn |
| 推荐引用方式 GB/T 7714 | Wei, Changfu,Yan, Rongtao. Constitutive Model for Gas Hydrate-Bearing Soils Considering Hydrate Occurrence Habits[J]. INTERNATIONAL JOURNAL OF GEOMECHANICS,2017,17(8):-. |
| APA | Wei, Changfu,&Yan, Rongtao.(2017).Constitutive Model for Gas Hydrate-Bearing Soils Considering Hydrate Occurrence Habits.INTERNATIONAL JOURNAL OF GEOMECHANICS,17(8),-. |
| MLA | Wei, Changfu,et al."Constitutive Model for Gas Hydrate-Bearing Soils Considering Hydrate Occurrence Habits".INTERNATIONAL JOURNAL OF GEOMECHANICS 17.8(2017):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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