砂土液化过程中桩-土动力相互作用 p-y 曲线特性

In order to study the pile-soil dynamic interaction in the process of soil liquefaction, the shake-table test of pile-soil structure interaction was completed based on sine wave loading, in which the p-y curve of pile-soil dynamic interaction was established and the p-y curve characteristics of pile-soil dynamic interaction in the soil liquefaction process were described. Results show that the pore pressure of the sand layer increases rapidly under high-frequency sine wave loading; in the process of sand liquefaction, the bending moment of the pile increases and then decreases. Under low-frequency loading, the hysteresis loop of the dynamic p-y curve of sand does not soften; under high-frequency loading, the area of the hysteresis loop of the dynamic p-y curve increases, and the reaction force of pile side soil increases. The dynamic p-y curve of liquefied sand is concave. The research results can provide a reference for pile foundation design and engineering construction in liquefaction sites.