开口与闭口管桩连续贯入机理的可视化模型试验研究
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TU 443

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Visual model experimental study on penetration behaviour of open-ended and closed-ended pipe piles
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    摘要:

    静压管桩连续贯入的动力响应不仅会引起土体的局部大变形,还会改变桩周土体的有效应力状态,从而影响自身的贯入阻力以及桩基承载力时效。现有研究更多关注的是沉桩后的承载变化,对于沉桩过程贯入机理的认识仍相对不足。为此,克服传统全模型试验不可视的局限,通过透明土可视化物理模型试验开展了开口与闭口管桩静压沉桩连续贯入全过程的对比试验,获得了开口与闭口管桩相同沉桩条件下的桩周土体的位移场。系统研究了两种形式下全时空域的桩周土体扰动变化规律及承载特性的发挥,并讨论了开口与闭口管桩贯入机理的差异性。试验结果表明:由于土塞效应渐进调动的原因导致开口与闭口管桩的挤土效应发挥机理存在较大差异,闭口管桩连续贯入引起的位移矢量场的模式主要以桩端放射状挤压土体运动为主,而开口管桩的位移矢量场则表现为管桩内部竖向位移最大、桩身两侧的扰动变形较小;贯入初期,开口管桩所调动的贯入阻力远小于闭口管桩,随着土塞程度的增大,土塞效应引起的开口管桩的土塞端阻对于总贯入阻力的贡献占比逐渐增大。

    Abstract:

    The dynamic response of continuous penetration of pipe piles will not only cause large local deformation, but also change the effective stress state, thus affecting the penetration resistance and pile set-up. The penetration mechanism of pile penetration is still unclear. Therefore, to overcome the limitation of a traditional model test, a comparative test of the penetration process of open-ended and closed-ended pipe piles was carried out through the transparent soil model test. The displacement field of soil around the pile under the same condition as open-ended and closed-ended pipe piles was obtained. The variation law of soil disturbance around the pile and the bearing characteristics are systematically studied, and the differences in the penetration mechanism of open-ended and closed-ended pipe piles are discussed. The test results show that: Due to the progressive mobilization of plugging effect leads to a large difference in the mechanism of squeezing effect between open-ended and closed-ended pipe pile; The mode of displacement vector field of closed-ended pile is mainly dominated by the radial extruded, while open-ended pipe pile shows more significant vertical displacement disturbance inside the pile; With the increase of the degree of soil plug, the contribution of end resistance caused by plugging effect to total penetration resistance increases gradually.

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于洪川,代楠,陈逸飞,等. 开口与闭口管桩连续贯入机理的可视化模型试验研究[J]. 科学技术与工程, 2023, 23(15): 6573-6580.
Yu Hongchuan, Dai Nan, Chen Yifei, et al. Visual model experimental study on penetration behaviour of open-ended and closed-ended pipe piles[J]. Science Technology and Engineering,2023,23(15):6573-6580.

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历史
  • 收稿日期:2022-09-27
  • 最后修改日期:2023-05-11
  • 录用日期:2022-12-02
  • 在线发布日期: 2023-06-05
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