基于振动台试验的扩孔微型桩受力和变形性能研究

发布时间：2018-06-18 13:12

本文选题：新型半整体式桥台桥梁 + 扩孔微型桩　；参考：《建筑科学与工程学报》2017年04期

【摘要】：为了研究扩孔微型桩在地震作用下的受力和变形性能,在有无扩孔、不同扩孔深度、不同扩孔孔径、不同扩孔材料4种参数下对微型桩进行了振动台试验研究,计算得到了扩孔微型桩桩身弯矩和侧向位移,并分析得到了不同扩孔参数下微型桩的桩身弯矩与侧向峰值位移对应的埋深位置及桩身弯矩与位移的分布规律。结果表明:扩孔微型桩桩身峰值位移最大值出现在土体表面位置,并随桩深不断减小,扩孔后微型桩桩身峰值弯矩和峰值位移增大;随着扩孔深度的增加,桩身峰值位移和桩身峰值弯矩也增大,并且桩身峰值弯矩最大值点有向下移动的趋势;所得结论可为地震作用下扩孔微型桩受力和变形性能研究奠定基础,同时为新型半整体式桥台桥梁中扩孔微型桩的设计和应用提供参考。
[Abstract]:In order to study the mechanical and deformation behavior of reaming micro-pile under seismic action, the shaking table test of miniature pile was carried out under four parameters: with or without reaming hole, with different reaming depth, with different pore diameter and with different reaming material. The bending moment and lateral displacement of miniature pile with reaming hole are calculated, and the burying depth of pile bending moment and lateral peak displacement and the distribution law of bending moment and displacement of pile body are analyzed under different reaming parameters. The results show that the maximum peak displacement of the miniature pile body appears in the soil surface and increases with the increasing of the depth of the pile, and the peak bending moment and the peak displacement of the pile body increase with the increase of the depth of the enlarged hole, and the maximum displacement of the pile body increases with the increase of the depth of the pile. The peak displacement of pile body and the peak moment of pile body also increase, and the maximum point of peak moment of pile body tends to move downwards, which can lay a foundation for the study of stress and deformation behavior of reaming micro-pile under earthquake. At the same time, it provides a reference for the design and application of the new type semi-integral bridge.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金项目(51278126,51578161)
【分类号】：U443.15

【参考文献】