Review on research and engineering application of energy pile technology

The energy pile technology is an innovative development of the borehole buried pipe heat exchanger technology, which has the advantages of saving floor area, reducing cost and improving construction efficiency. In order to make full use of the energy saving and high efficiency advantages of energy pile technology on the basis of structural safety, it is necessary to deeply understand and master the heat transfer characteristics and thermo-mechanical coupling laws of energy piles. Summarizes the research and engineering application progress of energy pile technology in Austria, Switzerland, the United Kingdom, the United States, Japan, South Korea and other countries, including the heat transfer performance of energy piles, the law of thermo-mechanical coupling and typical application cases, analyses the existing problems and challenges, and puts forward the key research and development direction in the future.