任连伟, 詹俊峰, 张敏霞. 2017: 五星形桩抗拔承载性能模型试验研究. 工程地质学报, 25(1): 58-64. DOI: 10.13544/j.cnki.jeg.2017.01.008
    引用本文: 任连伟, 詹俊峰, 张敏霞. 2017: 五星形桩抗拔承载性能模型试验研究. 工程地质学报, 25(1): 58-64. DOI: 10.13544/j.cnki.jeg.2017.01.008
    REN Lianwei, ZHAN Junfeng, ZHANG Minxia. 2017: MODEL TEST RESEARCH ON UPLIFTING BEARING CAPACITY OF STAR-SHAPED PILE. JOURNAL OF ENGINEERING GEOLOGY, 25(1): 58-64. DOI: 10.13544/j.cnki.jeg.2017.01.008
    Citation: REN Lianwei, ZHAN Junfeng, ZHANG Minxia. 2017: MODEL TEST RESEARCH ON UPLIFTING BEARING CAPACITY OF STAR-SHAPED PILE. JOURNAL OF ENGINEERING GEOLOGY, 25(1): 58-64. DOI: 10.13544/j.cnki.jeg.2017.01.008

    五星形桩抗拔承载性能模型试验研究

    MODEL TEST RESEARCH ON UPLIFTING BEARING CAPACITY OF STAR-SHAPED PILE

    • 摘要: 五星形桩是一种新型的截面异形桩,是在圆桩基础上向内切割5个圆弧,形成截面类似五星形的一种桩型。利用自主研发的多功能桩基模型试验加载系统,砂雨法成桩,进行了4根五星形与圆形桩(周长最大化五星形桩F1、周长面积比最大化五星形桩F2、与F2同截面周长的圆桩C1、与F2同截面面积的圆桩C2)抗拔承载特性对比模型试验研究。试验结果表明:(1)五星形桩F1与F2的极限抗拔力基本相同,大圆桩C1最大,小圆桩C2最小。(2)大圆桩C1的极限抗拔力是F2的1.73倍,说明五星形截面形式对抗拔侧摩阻力产生了较明显的弱化。(3)小圆桩C2的侧表面积是F2的0.66倍,但其极限抗拔力是F2的0.8倍,这进一步说明五星形截面形式对抗拔侧摩阻力有一定程度的弱化。但F2的极限抗拔力是C2的1.25倍,可见桩的截面形式由圆形转变为五星形可一定程度地提高抗拔承载能力。(4)抗拔侧摩阻力与上拔位移呈双曲线分布,仅需较小位移就可达到极值。

       

      Abstract: Star-shaped pile is a new type of special-section pile. It is formed by cutting five circular arcs in a circle pile. This paper aims to explore the uplifting bearing capacity of star-shaped piles. For comparison, the experimental tests on four single piles in dry sand by sand pourer construction are carried out in model tank of independent research and development. The four tested piles are the maximum ratio of perimeter and area of the five-star-shaped pile F1,the maximum of the circumference of the five-star-shaped pile F2,the round pile C1 with the same section of F2, and the round pile C2 with the same cross-sectional area of F2. Test results show:(1) The uplifting bearing capacity values of the pile F1 and F2 are basically the same. The maximum is the pile C1. The minimum is the pile C2. (2) The uplifting bearing capacity value of the pile C1 is 1.73 times that of the pile F1. The uplifting side resistance is weakened because of star-shaped section. (3) The side area of the pile C2 is 0.66 times that of the pile F2,but its uplifting bearing capacity is 0.8 times of the pile F2. So it shows again that the star-shaped section weakens the uplifting side resistance. However, the uplifting bearing capacity value of the pile F2 is 1.25 times that of the pile C2,which shows that the circular section changing into the star-shaped section can improve the uplifting bearing capacity to some extent.(4) The distribution between uplifting side friction and displacement is hyperbolic. The side limiting friction is reached only by a little displacement.

       

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