饱和砂土地基中群桩侧向动力响应试验与数值模拟对比研究

发布时间：2018-03-20 14:11

本文选题：饱和砂土　切入点：群桩振动台试验　出处：《世界地震工程》2016年04期 　论文类型：期刊论文

【摘要】：可液化场地中桩基尤其是群桩的横向动力响应特性的研究,一直是国内外岩土地震工程领域关注的热点问题。由于桩-土-承台结构动力相互作用过程的复杂性,基于砂土-群桩-承台结构模型振动台试验,对饱和砂土中群桩侧向动力响应特性进行了分析。在此基础上,通过大型有限元软件OpenSees建立了三维模型,展开了数值模拟研究,并将数值模拟结果与试验结果进行了对比研究。结果表明:在正弦波输入下,无论是干砂还是饱和砂土试验,群桩承台加速度和位移时程与模拟承台加速度和位移时程在曲线趋势和峰值上基本吻合;在El-Centro地震波输入下,干砂和饱和砂土的模拟承台加速度时程曲线峰值和趋势与试验的比较吻合,而承台位移时程曲线频率比试验要高,但承台位移峰值基本一致。
[Abstract]:The study of lateral dynamic response of pile foundation, especially pile group in liquefiable site, has always been a hot issue in the field of geotechnical seismic engineering at home and abroad, because of the complexity of pile-soil-cap structure dynamic interaction process. Based on the shaking table test of the sand pile group pile cap structure model, the lateral dynamic response characteristics of the pile group in saturated sand are analyzed. On this basis, a three dimensional model is established through a large finite element software OpenSees, and the numerical simulation is carried out. The numerical simulation results are compared with the experimental results. The results show that under sinusoidal wave input, both dry sand and saturated sand are tested. The acceleration and displacement time history of pile cap is basically consistent with that of simulated cap acceleration and displacement time history on the curve trend and peak value, and under the input of El-Centro seismic wave, The peak value and trend of the simulated acceleration time history curve of dry sand and saturated sand are consistent with that of the test, while the frequency of the displacement time history curve of the cap is higher than that of the test, but the peak displacement of the cap is basically the same.
【作者单位】：河北工业大学土木与交通学院;河北省土木工程技术研究中心;
【基金】：河北省自然科学基金资助项目(E2013202118) 中国博士后科学基金资助项目(2014M561169) 河北省住房和城乡建设厅(2014-231)
【分类号】：TU435

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