Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils
Arctic permafrost often contains gas-saturated horizons. The gas component in freezing and frozen soils can exist under different pressures, which are expected to affect their properties and behavior. The effect of pore gas pressure on the thermal conductivity of frozen and unfrozen silt loam satura...
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| Format: | Article |
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MDPI AG
2023-11-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/13/11/347 |
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| author | Evgeny Chuvilin Dinara Davletshina Boris Bukhanov Sergey Grebenkin |
| author_facet | Evgeny Chuvilin Dinara Davletshina Boris Bukhanov Sergey Grebenkin |
| author_sort | Evgeny Chuvilin |
| collection | DOAJ |
| description | Arctic permafrost often contains gas-saturated horizons. The gas component in freezing and frozen soils can exist under different pressures, which are expected to affect their properties and behavior. The effect of pore gas pressure on the thermal conductivity of frozen and unfrozen silt loam saturated with methane or carbon dioxide at pressures below the hydrate formation conditions is observed in the current study. The variable gas pressure and temperature conditions are simulated in a specially designed pressure cell, which allows thermal conductivity measuring in pressurized samples at positive and negative temperatures. The experiments using natural samples collected near the gas emission crater (Yamal Peninsula) show that thermal conductivity is sensitive to pore gas pressure even at high moisture contents. The thermal conductivity of methane-saturated soil becomes 4% and 6% higher in frozen and unfrozen samples, respectively, as the gas pressure increases from 0.1 MPa to 2 MPa. In the case of CO<sub>2</sub> saturation, the respective thermal conductivity increase in frozen and unfrozen samples reaches 25% and 15% upon pressure change from 0.1 to 0.9 MPa. The results stimulate further special studies of the effects of gas type and pressure on the thermal properties of closed gas-saturated taliks, of which the pore pressure is increasing during freezing up. |
| first_indexed | 2024-03-09T16:48:06Z |
| format | Article |
| id | doaj.art-a3298dfaff2645afb6d7fcf87c73867a |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T16:48:06Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-a3298dfaff2645afb6d7fcf87c73867a2023-11-24T14:44:30ZengMDPI AGGeosciences2076-32632023-11-01131134710.3390/geosciences13110347Thermal Conductivity of Frozen and Unfrozen Gas-Saturated SoilsEvgeny Chuvilin0Dinara Davletshina1Boris Bukhanov2Sergey Grebenkin3Center for Petroleum Science and Engineering, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 121205 Moscow, RussiaCenter for Petroleum Science and Engineering, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 121205 Moscow, RussiaCenter for Petroleum Science and Engineering, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 121205 Moscow, RussiaCenter for Petroleum Science and Engineering, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 121205 Moscow, RussiaArctic permafrost often contains gas-saturated horizons. The gas component in freezing and frozen soils can exist under different pressures, which are expected to affect their properties and behavior. The effect of pore gas pressure on the thermal conductivity of frozen and unfrozen silt loam saturated with methane or carbon dioxide at pressures below the hydrate formation conditions is observed in the current study. The variable gas pressure and temperature conditions are simulated in a specially designed pressure cell, which allows thermal conductivity measuring in pressurized samples at positive and negative temperatures. The experiments using natural samples collected near the gas emission crater (Yamal Peninsula) show that thermal conductivity is sensitive to pore gas pressure even at high moisture contents. The thermal conductivity of methane-saturated soil becomes 4% and 6% higher in frozen and unfrozen samples, respectively, as the gas pressure increases from 0.1 MPa to 2 MPa. In the case of CO<sub>2</sub> saturation, the respective thermal conductivity increase in frozen and unfrozen samples reaches 25% and 15% upon pressure change from 0.1 to 0.9 MPa. The results stimulate further special studies of the effects of gas type and pressure on the thermal properties of closed gas-saturated taliks, of which the pore pressure is increasing during freezing up.https://www.mdpi.com/2076-3263/13/11/347permafrostgas-saturated sedimentsthermal propertyexperimental modellingfreezing under gas pressurethermal conductivity |
| spellingShingle | Evgeny Chuvilin Dinara Davletshina Boris Bukhanov Sergey Grebenkin Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils Geosciences permafrost gas-saturated sediments thermal property experimental modelling freezing under gas pressure thermal conductivity |
| title | Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils |
| title_full | Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils |
| title_fullStr | Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils |
| title_full_unstemmed | Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils |
| title_short | Thermal Conductivity of Frozen and Unfrozen Gas-Saturated Soils |
| title_sort | thermal conductivity of frozen and unfrozen gas saturated soils |
| topic | permafrost gas-saturated sediments thermal property experimental modelling freezing under gas pressure thermal conductivity |
| url | https://www.mdpi.com/2076-3263/13/11/347 |
| work_keys_str_mv | AT evgenychuvilin thermalconductivityoffrozenandunfrozengassaturatedsoils AT dinaradavletshina thermalconductivityoffrozenandunfrozengassaturatedsoils AT borisbukhanov thermalconductivityoffrozenandunfrozengassaturatedsoils AT sergeygrebenkin thermalconductivityoffrozenandunfrozengassaturatedsoils |