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首页> 外文期刊>Advances in civil engineering >A Full-Scale Field Study on Bearing Characteristics of Cast-in-Place Piles with Different Hole-Forming Methods in Loess Area
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A Full-Scale Field Study on Bearing Characteristics of Cast-in-Place Piles with Different Hole-Forming Methods in Loess Area

机译：黄土地区不同成孔方法的灌注桩承载特性全尺寸研究

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摘要

This paper presents the results from a full-scale field study on the 3 different types of cast-in-place piles: rotary drilling piles (RDPs), manual digging piles (MDPs), and impact drilling piles (IDPs), for a bridge construction project of Wuqi-Dingbian Expressway, in Shaanxi. The results indicate that under the similar conditions, MDP exhibits the largest bearing capacity (11000kN) in the loess area, followed by RDP (9000kN) and IDP (8000kN). And all tested values exceed the estimated value (7797.9KN), indicating that the calculation formula of bearing capacity recommended by the Chinese standard is safe and conservative. During the load transfer process, the axial force attenuation rate of the pile body increases with pile side resistance. The average attenuation rate of MDP is the largest (24.2%), followed by RDP (19.72%) and IDP (16.69%). The bearing characteristics of these test piles are mainly pile side resistance, but the manual digging method created the least amount of disturbance to the soil around the pile, and due to its hole wall being rough, this enhances the pile-soil interactions. Hole-forming methods mainly affect the exertion of pile side resistance compared with pile end resistance. In view of pile side resistance and pile end resistance not taking effect at the same time, degree of exertion of these 2 resistances should be considered when designing cast-in-place piles in loess areas, and different partial coefficients should be used.
机译：本文介绍了对三种不同类型的现浇桩进行的全面实地研究的结果：旋转钻桩（RDP），手动挖掘桩（MDP）和冲击钻桩（IDP），用于桥梁陕西吴起-定边高速公路建设项目。结果表明，在相似的条件下，MDP在黄土地区表现出最大的承载能力（11000kN），其次是RDP（9000kN）和IDP（8000kN）。并且所有测试值均超过估计值（7797.9KN），表明中国标准推荐的承载力计算公式是安全和保守的。在荷载传递过程中，桩身的轴向力衰减率随桩侧阻力而增大。 MDP的平均衰减率最大（24.2％），其次是RDP（19.72％）和IDP（16.69％）。这些测试桩的承载特性主要是桩侧阻力，但是手动挖掘方法对桩周围土壤的干扰最小，并且由于其孔壁粗糙，这增强了桩-土的相互作用。与桩端阻力相比，成孔方法主要影响桩侧阻力的发挥。考虑到桩侧阻力和桩端阻力不能同时发挥作用，在黄土地区设计现浇桩时应考虑这两个阻力的作用程度，并应使用不同的分项系数。

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  • 来源
    《Advances in civil engineering》 |2019年第6期|1450163.1-1450163.12|共12页
  • 作者

    Zhou Zhijun; Yang Tao; Fan Haobo;

  • 作者单位

    Changan Univ Sch Highway Xian 710064 Shaanxi Peoples R China;

    Changan Univ Sch Highway Xian 710064 Shaanxi Peoples R China|China Railway Eryuan Engn Grp Co Ltd Chengdu 610031 Sichuan Peoples R China;

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