Abstract：In order to analyze the thermal-mechanical coupling behavior of energy piles, the temperature distribution in energy piles should be investigated firstly. In this study, the temperature distribution laws in energy piles from the practical measurements are summarized, and numerical simulations are conducted on the thermal responses of Xinyang piles for 168 hours. The numerical model is verified by comparing the simulation results and measured results on inlet/outlet fluid temperature, the temperature distribution in the pile section and the surrounding soil temperature. Based on the simulation results from various TRT tests with different thermal conductivity of soil , different heating duration and different exchanger types, it can be concluded that after 7 days′ heating with the heating power of 70W/m, the average temperature of pile shaft may increase by 0.7 ℃ as the thermal conductivity of surrounding soil decreases by 0.3W/(m·K), while it may decrease by 1 ℃ as the pile diameter increases by 200mm; Compared to the pile with U-shaped exchanger, the pile with spiral-shaped exchanger possesses higher average temperature with the sectional temperature distributed more uniformly.
李翔宇 郭红仙 程晓辉. 能源桩温度分布的试验与数值研究[J]. 土木工程学报, 2016, 49(4): 102-110.
Li Xiangyu Guo Hongxian Cheng Xiaohui. Experimental and numerical study on temperature distribution in energy piles. 土木工程学报, 2016, 49(4): 102-110.
