桩底土参数对桩顶速度波影响的研究

Study of Influence of Pile-bottom-soil Parameters on the Velocity Wave at Top of Pile

选用黄土作为桩底土进行桩土相互作用的模型试验．应用回传射线矩阵法对不同压实状态下桩底土的刚度系数和阻尼系数进行拟合。试验结果表明：土越密实，桩底刚度系数就越大．实测桩顶速度波时程曲线就越往下倾斜。

Loess was used as pile-bottom-soil, and the interaction of pile-bottom-soil and pile was researched with laboratory model experiments. The reverberation-ray matrix method was applied to fit stiffness and damping coefficients of pile-bottom-soil at different compaction condition. The experimental restilts showed that the denser soil is, the greater stiffness coefficients are, the more downward the measured velocity time-history curves at top of pile bias.