ABSTRACT
Energy pile is a new shallow geothermal energy mining technology that involves the exchange of heat with surrounding soil through the built-in circulating pipe. To analyze the variation law of the thermodynamic characteristics of the pile body during the cold and heat cycle of the energy pile in the loess foundation, based on the indoor model test, the variation processes of the pile body temperature, the pile top settlement, the pile internal force of the energy pile under the two working conditions of temperature load and thermal-mechanical coupling are measured. The test results show that the temperature of the energy pile in the loess foundation decreases with the increase in effective depth of the pile; at the end of the cold and thermal cycles, the pile top of the energy pile produces cumulative settlement; the strain of pile body in sandy soil layer is greater than that in loess layer.
