Chapter
Mar 30, 2017
Soil-Concrete Interface Properties Subjected to Temperature Changes and Cycles Using Direct Shear Tests
Authors: Suguang Xiao, S.M.ASCE [email protected], Muhannad T. Suleiman, Ph.D., M.ASCE [email protected], Rehab Elzeiny, S.M. ASCE [email protected], Huan Xie [email protected], and Mohammed Al-Khawaja [email protected]Author Affiliations
Publication: Geotechnical Frontiers 2017
Abstract
Geothermal foundations (energy piles) combine the structural function of deep foundations with the ground source heat exchangers to transfer geothermal energy to superstructures. The intermittent operation of the geothermal energy pile system results in cyclic thermal loading on the soil-pile interface. To investigate the effects of cyclic thermal loading on soil-concrete interface properties, a conventional direct shear device was modified by replacing the bottom shear box with a concrete plate that has embedded aluminum tubes to heat and cool the interface. A series of tests were conducted with interface temperatures of 4.5, 22.5, and 42.5 °C, respectively. The normal stresses of the direct shear tests were 27.6, 41.4, and 100 kPa. The tests were performed both under cooling and heating with thermal cycle numbers of 0.5 and 10.5. The aforementioned tests were conducted at a shearing rate of 3 mm/min, and the water contents of all the samples were approximately 18.5%. The responses of soil-concrete interface at different temperatures and temperature cycles are presented in this paper.
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© 2017 American Society of Civil Engineers.
History
Published online: Mar 30, 2017
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ASCE Technical Topics:
- Energy engineering
- Energy sources (by type)
- Engineering fundamentals
- Foundations
- Geomechanics
- Geotechnical engineering
- Laboratory tests
- Measurement (by type)
- Pile foundations
- Pile tests
- Renewable energy
- Shear tests
- Soil mechanics
- Soil properties
- Soil tests
- Stress (by type)
- Structural analysis
- Structural behavior
- Structural engineering
- Temperature effects
- Temperature measurement
- Tests (by type)
- Thermal loads
- Thermal power
Authors
Affiliations
Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015. E-mail: [email protected]
Associate Professor, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015. E-mail: [email protected]
Graduate Student, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015. E-mail: [email protected]
Undergraduate Student, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015. E-mail: [email protected]
Associate Professor, Dept. of Mechanical and Industrial Engineering, Qatar Univ., Doha, Qatar. E-mail: [email protected]
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