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Experimental Study on the Behavior of X-Section Pile Subjected to Cyclic Axial Load in Sand

机译：砂土中轴心荷载作用下X型桩性能的试验研究

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摘要

X-section cast-in-place concrete pile is a new type of foundation reinforcement technique featured by the X-shaped cross-section. Compared with a traditional circular pile, an X-section pile with the same cross-sectional area has larger side resistance due to its larger cross-sectional perimeter. The behavior of static loaded X-section pile has been extensively reported, while little attention has been paid to the dynamic characteristics of X-section pile. This paper introduced a large-scale model test for an X-section pile and a circular pile with the same cross-sectional area subjected to cyclic axial load in sand. The experimental results demonstrated that cyclic axial load contributed to the degradation of shaft friction and pile head stiffness. The dynamic responses of X-section pile were determined by loading frequency and loading amplitude. Furthermore, comparative analysis between the X-section pile and the circular pile revealed that the X-section pile can improve the shaft friction and reduce the cumulative settlement under cyclic loading. Static load test was carried out prior to the vibration tests to investigate the ultimate bearing capacity of test piles. This study was expected to provide a reasonable reference for further studies on the dynamic responses of X-section piles in practical engineering.
机译：X形现浇混凝土桩是一种新型的基础加固技术，其特征是X形横截面。与传统的圆形桩相比，具有相同横截面积的X型桩由于其较大的横截面周长而具有更大的侧阻力。静态加载的X形桩的性能已得到广泛报道，而对X形桩的动态特性却很少关注。本文介绍了X型截面桩和相同横截面的圆形桩在沙土中承受循环轴向载荷的大型模型试验。实验结果表明，循环轴向载荷有助于降低轴的摩擦力和桩头的刚度。 X形截面桩的动力响应由加载频率和加载幅度确定。此外，X形桩和圆形桩的对比分析表明，X形桩可以提高轴的摩擦力，减少循环荷载下的累积沉降。在振动测试之前进行了静载荷测试，以研究测试桩的极限承载力。该研究有望为进一步研究X形截面桩在实际工程中的动力响应提供合理的参考。

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  • 来源
    《Shock and vibration》 |2017年第8期|335-343|共9页
  • 作者

    Lu Yiwei; Liu Hanlong; Zheng Changjie; Ding Xuanming;

  • 作者单位

    Hohai Univ Sch Civil & Transportat Engn Nanjing 210098 Jiangsu Peoples R China|Hohai Univ Minist Educ Geomech & Embankment Engn Key Lab Nanjing 210098 Jiangsu Peoples R China|Univ Western Australia Sch Civil Environm & Min Engn Perth WA 6009 Australia;

    Hohai Univ Sch Civil & Transportat Engn Nanjing 210098 Jiangsu Peoples R China|Hohai Univ Minist Educ Geomech & Embankment Engn Key Lab Nanjing 210098 Jiangsu Peoples R China|Chongqing Univ Sch Civil Engn Chongqing 400045 Peoples R China;

    Chongqing Univ Sch Civil Engn Chongqing 400045 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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