Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity Analysis
Different gas hydrate types, such as methane hydrate and carbon dioxide hydrate, exhibit distinct geomechanical responses and hydrate morphologies in gas-hydrate-bearing sediments (GHBSs). However, most constitutive models for GHBSs focus on methane-hydrate-bearing sediments (MHBSs), while largely o...
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2025-02-01
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| Series: | Journal of Marine Science and Engineering |
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| author | Chenglang Li Jie Yuan Jie Cui Yi Shan Shuman Yu |
| author_facet | Chenglang Li Jie Yuan Jie Cui Yi Shan Shuman Yu |
| author_sort | Chenglang Li |
| collection | DOAJ |
| description | Different gas hydrate types, such as methane hydrate and carbon dioxide hydrate, exhibit distinct geomechanical responses and hydrate morphologies in gas-hydrate-bearing sediments (GHBSs). However, most constitutive models for GHBSs focus on methane-hydrate-bearing sediments (MHBSs), while largely overlooking carbon-dioxide-hydrate-bearing sediments (CHBSs). This paper proposes a modified Mohr–Coulomb (M-C) model for GHBSs that incorporates the geomechanical effects of both MHBSs and CHBSs. The model integrates diverse hydrate morphologies—cementing, load-bearing, and pore-filling—into hydrate saturation and incorporates an effective confining pressure. Its validity was demonstrated through simulations of reported triaxial compression tests for both MHBSs and CHBSs. Moreover, a variance-based sensitivity analysis using Sobol’s method evaluated the effects of hydrate-related soil properties on the geomechanical behavior of GHBSs. The results indicate that the shear modulus influences the yield axial strain of the CHBSs and could be up to 1.15 times more than that of the MHBSs. Similarly, the bulk modulus showed an approximate 5% increase in its impact on the yield volumetric strain of the CHBSs compared with the MHBSs. These findings provide a unified framework for modeling GHBSs and have implications for CO<sub>2</sub>-injection-induced methane production from deep sediments, advancing the understanding and simulation of GHBS geomechanical behavior. |
| format | Article |
| id | doaj-art-d533e478cf9e440cbace78fe86fdbb65 |
| institution | Kabale University |
| issn | 2077-1312 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-d533e478cf9e440cbace78fe86fdbb652025-08-20T03:43:22ZengMDPI AGJournal of Marine Science and Engineering2077-13122025-02-0113344010.3390/jmse13030440Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity AnalysisChenglang Li0Jie Yuan1Jie Cui2Yi Shan3Shuman Yu4School of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, ChinaHildebrand Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, TX 78712, USADifferent gas hydrate types, such as methane hydrate and carbon dioxide hydrate, exhibit distinct geomechanical responses and hydrate morphologies in gas-hydrate-bearing sediments (GHBSs). However, most constitutive models for GHBSs focus on methane-hydrate-bearing sediments (MHBSs), while largely overlooking carbon-dioxide-hydrate-bearing sediments (CHBSs). This paper proposes a modified Mohr–Coulomb (M-C) model for GHBSs that incorporates the geomechanical effects of both MHBSs and CHBSs. The model integrates diverse hydrate morphologies—cementing, load-bearing, and pore-filling—into hydrate saturation and incorporates an effective confining pressure. Its validity was demonstrated through simulations of reported triaxial compression tests for both MHBSs and CHBSs. Moreover, a variance-based sensitivity analysis using Sobol’s method evaluated the effects of hydrate-related soil properties on the geomechanical behavior of GHBSs. The results indicate that the shear modulus influences the yield axial strain of the CHBSs and could be up to 1.15 times more than that of the MHBSs. Similarly, the bulk modulus showed an approximate 5% increase in its impact on the yield volumetric strain of the CHBSs compared with the MHBSs. These findings provide a unified framework for modeling GHBSs and have implications for CO<sub>2</sub>-injection-induced methane production from deep sediments, advancing the understanding and simulation of GHBS geomechanical behavior.https://www.mdpi.com/2077-1312/13/3/440carbon-dioxide-hydrate-bearing sedimentsmethane-hydrate-bearing sedimentsconstitutive modelglobal sensitivity analysis |
| spellingShingle | Chenglang Li Jie Yuan Jie Cui Yi Shan Shuman Yu Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity Analysis Journal of Marine Science and Engineering carbon-dioxide-hydrate-bearing sediments methane-hydrate-bearing sediments constitutive model global sensitivity analysis |
| title | Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity Analysis |
| title_full | Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity Analysis |
| title_fullStr | Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity Analysis |
| title_full_unstemmed | Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity Analysis |
| title_short | Mohr–Coulomb-Model-Based Study on Gas Hydrate-Bearing Sediments and Associated Variance-Based Global Sensitivity Analysis |
| title_sort | mohr coulomb model based study on gas hydrate bearing sediments and associated variance based global sensitivity analysis |
| topic | carbon-dioxide-hydrate-bearing sediments methane-hydrate-bearing sediments constitutive model global sensitivity analysis |
| url | https://www.mdpi.com/2077-1312/13/3/440 |
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