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Investigating the Behavior of the Group Energy Pile in Unsaturated Silty Sand Soil Using Physical Modelling

Fardin Jafarzadeh | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56095 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzadeh, Fardin
  7. Abstract:
  8. A physical model has been developed in the advanced soil mechanic lab of the sharif university of technology. This model has been used to investigate the thermo-hydro-mechanical behavior of the group energy pile, which was embedded in the unsaturated silty sand soil. This model contains a steel soil box, 4 aluminum piles, strain gauges, the total pressure cells, the thermocouples, and the mechanical load. Three sets of tests were conducted on these piles. In the first the thermal cycles were applied on 1 pile and in the second and third tests, the number of the energy piles was 2 and 3, respectively. The result has shown there was a permanent settlement at the end of the thermal cycles. Also, by increasing temperature, the axial force in energy piles increased. However, in other piles because of the pile's cap tilting, axial force decreased. The total pressure in the pile’s toe decreased by increasing applying heat cycles and decreased by decreasing temperature. The pile’s shaft resistance in the upper half of the piles increased while the temperature increased. However, in the lower half, it increased during heat cycles. By increasing the number of thermal cycles, there is a small change in the pile’s shaft resistance. The bending moment in the upper part of the piles changes as the temperature changes. But, at the lower part of the piles because of the soil confinement, the bending moment didn’t change significantly
  9. Keywords:
  10. Physical Modeling ; Pile Group ; Energy Pile Group ; Heat Exchangers ; Unsaturated Soil

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