| Summary: | Energy pile becomes a new application of foundation, instead of the traditional ground source heat pump system. The heat exchange efficiency and its structural response induced by thermal stress is an urgent issue for the usage of shallow geothermal in foundations. In this study, the field experiments are systematically carried out by using engineering test pile as energy pile, the comprehensive thermal conductivity and heat exchange rate of each pile are achieved by thermal performance tests. Then the deformation and stress-strain of a heating or cooling pile at different temperature are analyzed to explore the influence of thermal stress on pile structure. Finally, the thermal stress distribution along the pile is calculated, and its bearing capability is analyzed. The results are applied to the design and application of energy piles.
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