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首页> 外文期刊>Computers and Geotechnics >Settlement analysis of piled-raft foundations by means of a multiphase model accounting for soil-pile interactions
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Settlement analysis of piled-raft foundations by means of a multiphase model accounting for soil-pile interactions

机译：利用考虑土-桩相互作用的多阶段模型对桩-筏基础进行沉降分析

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摘要

The behavior of vertically loaded raft foundations, strengthened by a large group of floating piles, is investigated by means of a multiphase approach, where special emphasis is put on the ground-pile interactions, which play an important role on the foundation performance. A new specific interaction law relating to the pile tip resistance is incorporated into the multiphase model, in addition to that already developed for pile shaft friction in a previous version. A numerical identification procedure is presented, which allows evaluation of the stiffness and yield strength parameters governing such interaction laws, as functions of the different geometric characteristics defining the pile layout (pile diameter and spacing), along with the material constitutive properties of the soil, modeled as a purely cohesive clay. The improved multiphase model, implemented in a finite element code, is used to analyze the response of a square raft lying upon a group of piles, varying the pile number and pile length. A relatively good agreement is obtained between the results of this approach, expressed in terms of load-settlement behavior as well as pile force distributions, and those derived from direct computationally intensive finite element calculations, where piles are regarded as individual elements embedded in the soil.
机译：通过多阶段方法研究了由大量浮动桩加强的垂直荷载筏式基础的性能，其中特别强调地桩相互作用，这对基础性能起着重要作用。除了在先前版本中已针对桩身摩擦开发的新的特定相互作用定律，还将与桩端阻力相关的新的特定相互作用定律纳入多相模型。提出了一种数字识别程序，该程序可以评估支配这种相互作用规律的刚度和屈服强度参数，以及定义桩布局（桩直径和间距）的不同几何特征以及土壤的材料本构特性的函数，建模为纯粘性粘土。改进的多相模型以有限元代码实现，用于分析放置在一组桩上的方木筏的响应，改变桩数和桩长。在此方法的结果（以载荷沉降行为和桩力分布表示）与直接计算密集型有限元计算（其中桩被视为埋在土壤中的单个元素）中得出的结果之间获得了相对较好的一致性。 。

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