水泥土桩及CFG桩刚柔组合桩复合地基动力试验结果分析

The Analysis of Dynamic Test Results on Cement-soil Pile and CFG Pile Combined Composite Foundation

基于优化桩型的思想,选取夯实水泥土桩及CFG桩进行优化组合,组成刚柔组合桩复合地基。用爆破的方式模拟地震提供震源,进行现场动力试验,通过研究不同载荷作用下,组合桩中夯实水泥土桩、CFG桩两种桩不同的动力反应,分别从峰值加速度、主频及持续时间的角度进行了对比研究,得到了在爆破地震荷载作用及其他条件都相同时,随着静载试验载荷量的增大,两种桩型的峰值加速度逐渐减小;两种桩型爆破地震动持续时间从桩顶到桩底逐渐增大的结论。

Based on the idea of pile-type optimization,rammed soil-cement pile and CFG pile composition were grouped to rigid-flexible piles composite foundation,the dynamic test were completed using blasting simulating earthquake,two different kinds piles dynamic response in rigid-flexible piles composite foundation were studied. From the Angle of the peak acceleration,frequency and duration are analyzed in comparison,we got the conclusions. In the same under blasting vibration loading,all other conditions being equal,along with the rising of the upper load,the peak accelerations of cement-soil pile and CFG pile composite foundation were decrease,Blasting vibration duration were increase gradually,from the pile bottom to top,the maximum were located on the top of the pile.