Vertical dynamic response of energy pile under different load frequencies and thermal conditions
WANG Chenglong1, SU Lingfei1, LIU Hanlong1, DING Xuanming1, KONG Gangqiang2
(1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210024, China)
Abstract：Currently, there is a considerable body of research focused on the thermo-mechanical behavior of energy piles under static loading; however, studies investigating the dynamic response of energy piles under cyclic loading remain limited. This study examines the dynamic response of single energy piles in sandy soil through model testing, analyzing changes in pile top displacement and cyclic stiffness characteristics. Additionally, a three-dimensional finite element model that accounts for the relevant behavior of the pile-soil contact surface under cyclic shear was developed and validated against the test results. Using this numerical model, the effects of the number of cycles, cyclic loading frequency, and temperature gradient on the vertical dynamic response of single energy piles were assessed. The findings indicate that as the number of cycles increases, the pile tip resistance appears to strengthen while the pile side resistance weakens, with the variation trend under heating conditions being more pronounced than that under cooling conditions. Furthermore, an increase in cyclic loading frequency leads to greater cumulative settlement of the energy pile, with the pile tip resistance showing an upward trend and the average pile side resistance a downward trend. Notably, the strengthening of pile tip resistance and the weakening of pile side resistance become less pronounced once a certain threshold is reached.
王成龙1，苏凌飞1，刘汉龙1，丁选明1，孔纲强2. 不同荷载频率与温度工况下能量桩竖向动力响应研究[J]. 岩石力学与工程学报, 2025, 44(12): 3430-3442.
WANG Chenglong1, SU Lingfei1, LIU Hanlong1, DING Xuanming1, KONG Gangqiang2. Vertical dynamic response of energy pile under different load frequencies and thermal conditions. , 2025, 44(12): 3430-3442.
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2025, Vol. 44 
