Influences of thermo-mechanical properties of clay on mechanical responses of energy piles

LU Hao-jie; KONG Gang-qiang; LIU Han-long; WU Di; CHEN Yong-hui

doi:10.11779/CJGE202201004

Volume 44 Issue 1

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Chinese Journal of Geotechnical Engineering > 2022 > 44(1): 53-61. > DOI: 10.11779/CJGE202201004

LU Hao-jie, KONG Gang-qiang, LIU Han-long, WU Di, CHEN Yong-hui. Influences of thermo-mechanical properties of clay on mechanical responses of energy piles[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(1): 53-61. DOI: 10.11779/CJGE202201004

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Influences of thermo-mechanical properties of clay on mechanical responses of energy piles

1.
College of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, China
3.
School of Science, Qingdao University of Technology, Qingdao 266033, China

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Received Date: August 31, 2020
Available Online: September 22, 2022

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Abstract

Abstract

Under the action of temperature variation induced by energy piles, the mechanical properties of soils surrounding the piles will be changed, thereby affecting their deformation, the stress of the pile-soil interface and the bearing capacity of the pile foundation. The ACMEG-T constitutive model for the thermal properties of soils is developed in ABAQUS commercial software. The accuracy of the program is verified by simulating the triaxial test results by using the UMAT subroutine. Based on the numerical simulation, the influence of thermo-mechanical properties of soils on the displacement of pile head, the stress of the pile-soil interface and the axial force of the energy piles in clay are studied. The results show that the change of soil temperature can lead to irretrievable settlement of soils, and further lead to negative skin friction on the pile shaft. The additional settlement and irreversible change of axial force of the energy piles can be induced by the negative skin friction. With the increase of the over-consolidation ratio of clay, the effects of thermo-mechanical properties of soils on the mechanical response of the energy piles decrease.
- energy pile,
- clay,
- constitutive model,
- over-consolidation ratio,
- numerical simulation

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References (24)

References

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