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Numerical Thermo-Mechanical Analysis of Single Thermal Piles in Clay

Kabiri Tadi, Matin | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52538 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. In recent years, growth of industries has led to consistent increase in energy consumption around the globe. On the other hand, non-renewable energy sources are the most consumed ones in the world. Therefore, governments and companies have tried to introduce budgets to facilitate the use of renewable energy sources and make their use cheaper. One of the renewable energy sources is geothermal energy which one economical way to havest it is thermal energy exchange between the building foundation and the ground. Therfore, thermal piles , by the use of a heat exchanger fluid, transfer the heat on the surface to the ground in warmer seasons and in cold seasons, they transfer the heat from the ground to the surface. By doing this, the amount of required energy for cooling or heating the building and water will be reduced. Many of these piles have been built around the world, but studying thermal effects on mechanical behavior of them has recently begun. Hence, in this study, a two dimensional thermo-mechanical analysis of the single thermal pile by COMSOL is represented. In this study, the clay is analyzed by its saturated thermal and strength parameters. For the matter of validation, field test results of the Lambeth college have been used. Also, the effect of temperature, pile size, pile ends restraint, Young’s modulus of soil and pile, and thermal expansion coefficient of soil and pile is studied. Results show that during the cooling process, tension and pile toe detachment from the soil occurs. Due to the lower tensile strength of concerete compared to its compressive strength, this amount of tensile force near the toe needs to be studied
  9. Keywords:
  10. Energy Pile ; Single Pile ; Thermo-Mechanical Analysis ; Axisymmetric Model ; Finite Element Method

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