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Numerical Investigation of the Thermo-mechanical Response of Single Energy Pile and a Group of Energy Piles

Razmkhah, Tahereh | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49755 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzadeh, Fardin; Ghasemi Fare, Omid
  7. Abstract:
  8. Geothermal piles are being used to serve dual purposes: transfer the structural load to the ground and act as heat exchanger elements to harvest and reject heat from and to the ground. Thermal loading can change the mechanical performance and bearing capacity of the geothermal piles during heating and cooling cycles. Therefore the thermo-mechanical responses of the geothermal piles should be comprehensively studied. In this paper the thermo-mechanical performance of a geothermal pile was analyzed using a 3D finite difference model in FLAC. The energy pile tests performed at Lambeth College, London were simulated using the developed numerical model. Comparison of both thermal strain and thermo-mechanical strain along the depth of the geothermal pile during both heating and cooling cycles confirm that the finite difference model can accurately simulate the thermo-mechanical performance of energy piles. The validated model have been used to study the effects of soil properties and thermal operations periods (both short-term, after 10 days, and long-term, after 2 months) on the response of the geothermal pile. Results showed that increasing the soil stiffness induces lower strains and higher stress along the pile. Increasing soil elastic modulus by 10 times results 5% reduction in the minimum axial strain in the geothermal pile. It is also important to note that the position of the null pints depends on the stiffness of the soil and pile. Results indicated that the null point positions moves upward by increasing the soil stiffness. Then energy group piles is modeled and group effects in thermal mode is analyzed
  9. Keywords:
  10. Energy Pile ; Temperature ; Thermal Loading ; Thermo-Mechanical Analysis ; Thermomechanical Loading ; Thermomechanic ; FLAC Software

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