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首页> 外文期刊>Mathematical Problems in Engineering >Bearing Characteristics of Composite Pile Group Foundations with Long and Short Piles under Lateral Loading in Loess Areas
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Bearing Characteristics of Composite Pile Group Foundations with Long and Short Piles under Lateral Loading in Loess Areas

机译：黄土地区长短桩复合桩基的横向荷载承载特性。

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摘要

It is very necessary to research the bearing characteristics of composite pile group foundations with long and short piles under lateral load in loess areas, because these foundations are used widely. But few people researched this problem in loess areas up to now worldwide. In this paper, firstly, an indoor test model of a composite pile foundation with long and short piles is designed and then employed to explore the vertical load bearing characteristics and load transfer mechanisms of a single pile, a four-pile group, and a nine-pile group under different lateral loads. Secondly, ANSYS software is employed to analyze the load-bearing characteristics of the test model, and for comparison with the experimental results. The results demonstrate the following. (1) The lateral force versus pile head displacement curves of the pile foundation exhibit an obvious steep drop in section, which is a typical feature of piercing damage. A horizontal displacement limit of the pile foundation is 10 mm and 6 mm for the ones sensitive to horizontal displacement. (2) The axial force along a pile and frictional resistance do not coincide, due to significant variations and discontinuities in the collapsibility of loess; a pile body exhibits multiple neutral points. Therefore, composite pile groups including both long and short piles could potentially maximize the bearing capacity and reduce pile settlement. (3) The distribution of stress and strain along the pile length is mainly concentrated from the pile head to a depth of about 1/3 of the pile length. If the lateral load is too large, short piles undergo rotation about their longitudinal axis and long piles undergo flexural deformation. Therefore, the lateral bearing capacity mainly relies on the strength of the soil at the interface with the pile or the horizontal displacement of the pile head.
机译：黄土地区在水平荷载下长短桩复合桩基的承载特性研究十分必要。但是迄今为止，很少有人在黄土地区研究此问题。本文首先设计了长短桩复合桩基础的室内试验模型，然后研究了单桩，四桩，九桩的竖向承载特性及荷载传递机理。桩在不同的侧向荷载作用下。其次，采用ANSYS软件对测试模型的承载特性进行分析，并与实验结果进行比较。结果证明了以下内容。 （1）桩基的横向力与桩头位移曲线表现出明显的截面陡降，这是穿刺破坏的典型特征。对于水平位移敏感的桩基，水平位移极限为10 mm和6 mm。 （2）由于黄土湿陷性的显着变化和不连续性，沿桩的轴向力和摩擦阻力不一致。桩身具有多个中性点。因此，包括长桩和短桩的复合桩组都可能最大化承载力并减少桩沉降。 （3）沿桩长方向的应力和应变分布主要从桩头集中到桩长的1/3左右。如果侧向载荷太大，则短桩会绕其纵轴旋转，而长桩会发生弯曲变形。因此，侧向承载力主要取决于与桩的交界处的土壤强度或桩头的水平位移。

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  • 来源
    《Mathematical Problems in Engineering》 |2018年第15期|8145356.1-8145356.17|共17页
  • 作者

    Ma Tianzhong; Zhu Yanpeng; Yang Xiaohui; Ling Yongqiang;

  • 作者单位

    Lanzhou Univ Technol Key Lab Disaster Prevent & Mitigat Civil Engn Gan Lanzhou 730050 Gansu Peoples R China|Lanzhou Univ Technol Western Engn Res Ctr Disaster Mitigat Civil Engn Minist Educ Lanzhou 730050 Gansu Peoples R China;

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