Construction and application of a PCC energy pile model test system

Abstract

PCC energy piles represent a new type of energy pile technology. At present, research on the bearing characteristics of PCC energy piles is relatively limited. This study designs and builds a PCC energy pile model test system, including a model pile, optical fiber sensors, and heat transfer, loading, and data acquisition devises. The system is used to study the bearing characteristics of PCC energy piles under different temperatures. Results show that the temperature of the pile is transferred to the soil along the radial direction under the action of a circulating temperature and the moisture in the soil around the pile migrates along the direction of heat transfer. The migration speed increases when the temperature gradient is large. At the end of circulation, the displacement of the pile top increases by 0.6% D, the resistance at the pile end increases by 1.28 times, and the maximum strain point of the pile body is 70%L from the pile top. The PCC energy pile test system proposed in this work is feasible and applicable.