颗粒级配和含水率对含团粒泥炭土导热特性的影响

石修松; 刘素素; 陆钊; 刘磊磊; 张福海

doi:10.3799/dqkx.2024.032

Volume 50 Issue 4

Apr. 2025

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Article Navigation > Earth Science > 2025 > 50(4): 1612-1624

Shi Xiusong, Liu Susu, Lu Zhao, Liu Leilei, Zhang Fuhai, 2025. Effect of Grading and Water Content on Thermal Conductivity of Natural Peat Aggregated Soils. Earth Science, 50(4): 1612-1624. doi: 10.3799/dqkx.2024.032

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Shi Xiusong, Liu Susu, Lu Zhao, Liu Leilei, Zhang Fuhai, 2025. Effect of Grading and Water Content on Thermal Conductivity of Natural Peat Aggregated Soils. Earth Science, 50(4): 1612-1624. doi: 10.3799/dqkx.2024.032

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Effect of Grading and Water Content on Thermal Conductivity of Natural Peat Aggregated Soils

doi: 10.3799/dqkx.2024.032

Shi Xiusong^{1, 2
,
,},
Liu Susu¹,
Lu Zhao^{3, 4},
Liu Leilei^{5, 6
,
,
,},
Zhang Fuhai¹

1.
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
2.
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
3.
HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute, Shenzhen 518031, China
4.
Research and Development Center, Shenzhen Foundation Engineering Co. Ltd., Shenzhen 518000, China
5.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
6.
Hunan Key Laboratory of Non-Ferrous Resources and Geological Hazard Exploration, Changsha 410083, China

Received Date: 2023-12-29
Available Online: 2025-05-10
Publish Date: 2025-04-25

Abstract

Abstract

Peat soil is a natural insulation material, which has a significant effect on the underlying frozen soil layer. Natural peat soil usually exists in the form of aggregates, and its particle size distribution has a spatial variability. However, the effect of gradings on the thermal conductivity is rarely reported. In this work, 66 laboratory tests were conducted on the peat soil to investigate the effects of coarse content, particle size ratio and water content on its thermal conductivity by a non-steady-state probe method.The results show that under the same relative density, the thermal conductivity of peat soil first increases and then decreases with the increase of coarse content, and reaches the peak value when the coarse content reaches 50%. For the peat soil with coarse dominated structure, the thermal conductivity increases distinctly with the increase of particle size ratio. However, the effect of particle size ratio reduces in the fine dominated structure. For a given void ratio, the thermal conductivity increases with the rising coarse content due to the thermal resistance and the particle contacts which are affected by particle size distribution; it increases with increasing particle size ratio in fine grain dominated structure but decreases in coarse grain dominated structure. In addition, the thermal conductivity of peat soil increases significantly with increasing water content, and the growth rate varies with the internal pores and the water distribution in the pores.
- peat soil,
- thermal conductivity,
- aggregate particle,
- particle size distribution,
- moisture content,
- engineering geology

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References(60)

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Effect of Grading and Water Content on Thermal Conductivity of Natural Peat Aggregated Soils

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