ISSN 1003-8035 CN 11-2852/P
    邓时容,肖世国. 嵌固段顶部拓宽型抗滑桩计算方法[J]. 中国地质灾害与防治学报,2022,33(4): 84-91. DOI: 10.16031/j.cnki.issn.1003-8035.202107006
    引用本文: 邓时容,肖世国. 嵌固段顶部拓宽型抗滑桩计算方法[J]. 中国地质灾害与防治学报,2022,33(4): 84-91. DOI: 10.16031/j.cnki.issn.1003-8035.202107006
    DENG Shirong, XIAO Shiguo. Calculation method of stabilizing piles with broadened top at the built-in section[J]. The Chinese Journal of Geological Hazard and Control, 2022, 33(4): 84-91. DOI: 10.16031/j.cnki.issn.1003-8035.202107006
    Citation: DENG Shirong, XIAO Shiguo. Calculation method of stabilizing piles with broadened top at the built-in section[J]. The Chinese Journal of Geological Hazard and Control, 2022, 33(4): 84-91. DOI: 10.16031/j.cnki.issn.1003-8035.202107006

    嵌固段顶部拓宽型抗滑桩计算方法

    Calculation method of stabilizing piles with broadened top at the built-in section

    • 摘要: 针对边坡工程中可能出现的普通抗滑桩嵌固段顶端前侧地层抗力不足的问题,提出嵌固段顶部拓宽型抗滑桩结构。基于水平受荷的弹性地基梁模型,推导滑床为多层岩土体的嵌固段顶部拓宽型桩的内力、位移、地层反力计算公式。实例分析表明,当桩体局部拓宽宽度为原桩宽度2倍时,嵌固段顶端地层反力可减小约25%,桩体最大弯矩及剪力减少5%~10%。讨论了拓宽宽度与深度、桩体嵌固深度、桩间距等主要因素对拓宽型桩内力与位移的影响,结果显示:普通桩经嵌固段顶部拓宽后,桩身水平位移与嵌固段顶端前侧地层反力显著降低;拓宽宽度与深度、嵌固段深度的增加均能增强拓宽型抗滑桩的水平承载能力,但当拓宽宽度达到原桩2倍、拓宽深度超过嵌固段深度40%后,继续拓宽对桩体水平承载能力的增加效果不显著。

       

      Abstract: In order to solve lacking of horizontal bearing capacity of local strata resistance before built-in section of the stabilizing pile, stabilizing piles with locally broadened top at the built-in section is proposed as a new type pile. According to analysis model of laterally loaded beam on elastic foundation, formulas for internal forces, displacement and strata resistance of the pile built in multiple stable layers are derived. Analysis results of an example show that if the width of the broadened section reaches double width of the normal pile, the resistance of the strata at the top of the broadened section reduces about 25% and the maximum bending moment and shear force of the pile decreases about 5%−10%. Further, influence of main factors such as broadened width and depth, length of the pile part in stable layers and pile spacing on internal forces and displacements of the pile is discussed. The results indicate that compared with the normal piles, the lateral displacement and the strata resistance of the new pile are significantly reduced. The horizontal bearing capacity of the broadened pile is increasing with the broadened width and depth as well as length of the built-in section. However, the improvement of the horizontal bearing capacity of the local strata is limited if the broadened pile width reaches double width of the normal pile and the broadened depth exceeds 40% of the length of the built in section.

       

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