可液化砂土中单桩地震响应的振动台试验研究

黄占芳; 王显耀; 吴植安; 白晓红

振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 189-192.

PDF(1318 KB)
PDF(1318 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 189-192.
论文

可液化砂土中单桩地震响应的振动台试验研究

  • 黄占芳1、2, 王显耀1, 吴植安1, 白晓红1
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The study of shaking table test about single pile-soil dynamic interaction in the liquefied foundation soil

  • HUANG Zhan-fang1,2,WANG Xian-yao1, WU Zhi-an1,BAI Xiao-hong1
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摘要

通过小型振动台动力模型试验,观测了饱和砂土中桩—土—结构(PSSI)在模拟地震力作用下的动力响应。研究结果表明:超静孔隙水压力在振动过程中不断增长,不同深度的土层均达到液化,并且离土面越近越先达到液化;土层的液化伴随着桩侧摩阻力的大大减弱,上部结构物的大部分荷载由桩底较硬持力层土承担,桩基的竖向承载力降低,上部结构的沉降量加大。同时在地震力的作用下PSSI效应加大了底层上部结构的地震反应。本研究加深了对饱和砂土在地震力作用下PSSI效应的理解,有助于建立或优化可液化土中桩基抗震设计方法。

Abstract

Based on the shaking table tests, the dynamic responses were observed about pile-soil- structure(PSSI) in the earthquake. The soil in the different depth liquefied with the continuous increase of excess pore water pressure in the vibration process, and the top soil first reached liquefaction. Pile side friction reduced greatly after the soil liquefied, the most of load of the upper structure was beared on bearing stratum, the vertical bearing capacity of pile foundation reduced significantly, the larger settlement of the upper structure produced. At the same time, the PSSI amplified earthquake reaction of the bottom super-structure. In this study, the pile-soil-structure dynamic interaction was understood deeply during liquefaction, which helps to build optimized method of seismic design of pile foundation.

关键词

液化 桩—土—结构 地震响应 孔压比 侧摩阻力 沉降 加速度

Key words

liquefaction / pile-soil-structure / seismic response / pore pressure ratio / side friction / settlement / acceleration

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导出引用
黄占芳; 王显耀; 吴植安; 白晓红. 可液化砂土中单桩地震响应的振动台试验研究[J]. 振动与冲击, 2012, 31(20): 189-192
HUANG Zhan-fang;WANG Xian-yao;WU Zhi-an;BAI Xiao-hong. The study of shaking table test about single pile-soil dynamic interaction in the liquefied foundation soil[J]. Journal of Vibration and Shock, 2012, 31(20): 189-192

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