Coupled model for contaminant diffusion, osmosis and consolidation in soil considering thermal effects

TIAN Gai-lei; ZHANG Zhi-hong

doi:10.11779/CJGE202202009

Volume 44 Issue 2

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Chinese Journal of Geotechnical Engineering > 2022 > 44(2): 278-287. > DOI: 10.11779/CJGE202202009

TIAN Gai-lei, ZHANG Zhi-hong. Coupled model for contaminant diffusion, osmosis and consolidation in soil considering thermal effects[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(2): 278-287. DOI: 10.11779/CJGE202202009

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Coupled model for contaminant diffusion, osmosis and consolidation in soil considering thermal effects

TIAN Gai-lei,
ZHANG Zhi-hong^,

The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

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Received Date: December 24, 2020
Available Online: September 22, 2022

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Abstract

Abstract

To explore the influences of temperature on pollutant transport, a coupled model for contaminant diffusion in soils, osmosis and consolidation considering the thermal effects is proposed to reflect the dynamic changes of physical properties of soils and transport properties in the process of pollutant transport and realize the coupling of diffusion, osmosis and consolidation. On the basis of verifying the validity of the model, the effects of thermal diffusion, thermo-osmosis, thermal consolidation and their combined effect on pollutant transport are analyzed. The simulated results show that the thermal diffusion and thermo-osmosis can accelerate contaminant transport, and with the increase of Soret coefficient and thermal permeability, the thermal diffusion and thermo-osmosis effects enhance. However, the thermal consolidation can slow down the pollutant transport rate, but with the increase of expansion coefficient of soils, the accumulation concentration of pollutant at the bottom of clay layer has little change. When the temperature difference is 40 K, the breakthrough time with considering the combined effects of thermal diffusion, thermo-osmosis and thermal consolidation can be shortened by 53.97 years compared with the results without considering the thermal effects.
- thermal diffusion,
- thermo-osmosis,
- thermal consolidation,
- contaminant transport

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References (34)

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