Study on the Heat Propagation Characteristics of Energy Pile-Soil under Long-Term Cycling Temperature
A centrifugal model test was conducted on an energy pile-soil heat conduction system,fea-turing a pile length of 52.5 meters and a pile diameter of 1.05 meters.This study investigated the heat transfer patterns between the energy pile and the surrounding soil over 30 cycles of cold and hot tem-perature.A long-term numerical model for the temperature field around the pile was established using ABAQUS finite element simulations and validated against centrifugal model test results.The follow-ing conclusions were drawn:the simulated temperature variations within each cycle closely matched the measured values,exhibiting consistent overall fluctuations and a maximum relative error of 5.6％,confirming the model's accuracy.The overall operational efficiency of the energy pile showed a declin-ing trend under long-term thermal cycling.Temperature changes in the soil at the pile end lagged be-hind those in the soil at the mid-section of the pile.To enhance the heat exchange performance of the energy pile,it was suggested to increase the density of the pipeline layout within the pile end area.During the heating stage of the thermal cycling,the peak temperature in the simulated variable temper-ature zone was higher than the measured peak temperature.Conversely,at the end of the cold cycle,the simulated values were lower.Additionally,the measured temperature variation time intervals at different distances from the pile lagged behind the simulated time intervals.This lag effect became more pronounced with an increasing number of cycles.
energy pilecentrifugal testthermal cyclingtemperature fieldnumerical simulation
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