According to the technical characteristics of preloading piles, by analyzing the mechanism of interaction of piles and soil, the mechanism of rebound of piles in the course of underpinning was gained.

• 摘要根据预压桩托换法的工艺特点，通过桩-土相互作用的工作原理分析，得出预压桩托换中桩体回弹的工作机理。