EXPERIMENTAL STUDY ON THERMO-MECHANICAL PROPERTIES OF ENERGY PILES UNDER ACTION OF CYCLIC TEMPERATURE

CHANG Hong; LIU Jinnan; MENG Qingyu

doi:10.13204/j.gyjzG20041107

Volume 51 Issue 1

Apr. 2021

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2021 > 51(1): 125-130

Yang Jun, Xu Wei. THE LOADED SWELLING RATIO TEST AND MODEL PREDICTION OF WEATHERED SAND IMPROVED EXPANSIVE SOIL UNDER FREEZE-THAW CYCLES[J]. INDUSTRIAL CONSTRUCTION, 2015, 45(1): 113-117. doi: 10.13204/j.gyjz201501022

Citation:

CHANG Hong, LIU Jinnan, MENG Qingyu. EXPERIMENTAL STUDY ON THERMO-MECHANICAL PROPERTIES OF ENERGY PILES UNDER ACTION OF CYCLIC TEMPERATURE[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(1): 125-130. doi: 10.13204/j.gyjzG20041107

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EXPERIMENTAL STUDY ON THERMO-MECHANICAL PROPERTIES OF ENERGY PILES UNDER ACTION OF CYCLIC TEMPERATURE

doi: 10.13204/j.gyjzG20041107

1. Surveying and Exploration Engineering Institute, Jilin Jianzhu University, Changchun 130118, China;
2. Jilin Province Engineering Technology Co., Ltd., Changchun 130012, China;
3. Shenkan Engineering & Technology Corporation, MCC Group, Shenyang 110169, China

Received Date: 2020-04-11
Available Online: 2021-04-30

Abstract

Abstract

Energy piles are combinations of pile foundations and ground source heat pumps. They not only bear the upper building load but also act as media for heat exchange with the shallow geothermal energy, which are of advantage on energy-saving and pollution reduction. Based on indoor model tests, the displacement of pile tops, pile bottom pressure, temperature stress and side friction resistance of energy piles in clay foundation under the action of cyclic temperature were experimentally studied. It was concluded that the rise or fall in temperature could also cause tensile and compressive stress in piles, stress increased first and then decreased in pile shafts from tops to bottoms of piles, and the maximum stress was close to the lower middle parts of piles. The compressive stress of pile bottoms increased with the increase of temperature, and the maximum compressive stress decreased with the increase of temperature cycles. Friction resistance of pile sides increased with the increase of temperature. During the period of being heated and cooled, and the negative friction resistance would be generated on upper parts and lower parts of piles respectively.
- energy pile,
- temperature field,
- side friction resistance,
- settlement,
- additional stress

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References(14)

References

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