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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Effect of cyclic jacking on sand-pile interface shear behaviour
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Effect of cyclic jacking on sand-pile interface shear behaviour

机译：循环超出对砂桩界面剪切行为的影响

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摘要

Pile jacking is a kind of competitive method for pile installation due to its less noise and vibration pollution. In this paper, the pile jacking process has been numerically simulated by considering the friction fatigue, and the characteristics of sand-pile interface shear paths at different depths were thoroughly investigated. It is found that during the cyclic jacking process, the interface shear path at a specified depth tends to transform from one-way shear to two-way shear, especially for the shallow to middle depth. But for the deep soil layer, one-way cyclic shear is still the dominated loading mode. Focusing the effects of different paths on the sand-pile interface shear behaviours, a series of cyclic interface shear tests have been conducted, in which two types of sands and four typical shear paths were adopted. It has been revealed that during continuous jacking process, the sample volume response changes significantly with different interface shear paths. The previous shear path also plays a key role in the cyclic degradation of interface strength with CNS (constant normal stiffness) condition. If the sample contraction is small during jacking process, the cyclic degradation of interface strength is obvious. But, when the sample contraction during jacking process is significant, the interface strength degradation is largely suppressed. This is mainly because the abundant broken fine particles along the pile shaft will fill into the voids and make the sand sample near the interface much denser. It is shown that the changes of pile-soil interface characteristics will affect the pile responses.
机译：由于其噪音和振动污染较小，桩顶是一种斗桩安装的竞争方法。本文通过考虑摩擦疲劳来进行数值模拟桩起动过程，彻底研究了不同深度的砂桩界面剪切路径的特征。结果发现，在循环起动过程中，指定深度的界面剪切路径倾向于从单向剪切转换为双向剪切，特别是对于浅到中间深度。但对于深土层，单向循环剪切仍然是主导的装载模式。对不同路径对砂桩接口剪切行为的影响，已经进行了一系列循环界面剪切测试，其中采用了两种类型的砂和四种典型的剪切路径。据透露，在连续的顶层过程中，样品体积响应随着不同的界面剪切路径而显着变化。先前的剪切路径在具有CNS（恒定正常刚度）条件的界面强度的循环劣化中也起着关键作用。如果在顶层过程中样品收缩较小，则界面强度的循环降解是显而易见的。但是，当顶升过程中的样品收缩很大时，界面强度降解大大抑制。这主要是因为沿着桩轴的丰富破碎的细颗粒将填充到空隙中并使砂样在界面附近更密集。结果表明，桩土界面特性的变化会影响桩响应。

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  • 来源
    《Soil Dynamics and Earthquake Engineering》 |2021年第2期|106479.1-106479.14|共14页
  • 作者

    Zhou Wenjie; Guo Zhen; Wang Lizhong; Li Jiahao; Rui Shengjie;

  • 作者单位

    Zhejiang Univ Coll Civil Engn & Architecture Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China;

    Zhejiang Univ Coll Civil Engn & Architecture Res Ctr Coastal & Urban Geotech Engn Hangzhou 310058 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pile jacking; Sand-pile interface shear; Shear path; Sample contraction; Particle breakage; Cyclic degradation;

    机译：堆起角;砂桩界面剪切;剪切路径;样品收缩;颗粒破损;循环降解;

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