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首页> 外文期刊>Proceedings of the Institutuion Civil Engineers >Numerical analysis of vertically loaded rammed aggregate piers and pier groups
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Numerical analysis of vertically loaded rammed aggregate piers and pier groups

机译：竖向夯实骨料墩和墩群的数值分析

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摘要

Predicting the effects of piers in settlement control and capacity enhancement of foundations supported by rammed aggregate piers (RAPs) is an important aspect in design of these foundations. To quantify these effects, employing the finite-element approach, a series of three-dimensional elasto-plastic numerical models of RAP foundations were developed. To take into account the influence of radial stress development in the matrix soil during the ramming process, which forces aggregate downwards and outwards into the borehole wall, the cavity was expanded both in radial direction and downward at the base of the pier. Using a parametric study, the effects of some parameters such as piers slenderness, the ratio of piers area to the foundation area and soil properties on static behaviour of such a foundation system were investigated. Using the results of the parametric study conducted on single piers, the research aimed also to provide new insights into the group behaviour of piers when they are subjected to vertical loads. The results demonstrated that the dominant deformation of piers in group is a tendency to tip-stress behaviour. Based on the results provided in this study, which were focused on the load-settlement behaviour of RAPs-supported foundations, a settlement-based design procedure was presented for RAP systems in which the values of slenderness and the area ratios are determined.
机译：预测墩台在夯实骨料墩（RAP）支撑下的基础的沉降控制和容量增强中的作用，是这些基础设计的重要方面。为了量化这些影响，采用有限元方法，开发了一系列RAP基础的三维弹塑性数值模型。考虑到夯实过程中基质土壤中径向应力发展的影响，该力会迫使骨料向下和向外进入井壁，因此在墩墩的底部沿径向和向下都扩展了空腔。通过参数研究，研究了墩长，墩面积与基础面积之比以及土壤特性等参数对此类基础系统静态性能的影响。利用在单个墩上进行的参数研究的结果，该研究还旨在为墩在垂直荷载下的群行为提供新的见解。结果表明，群中墩的主要变形是一种尖端应力行为。基于本研究提供的结果（专注于RAP支持的基础的荷载沉降行为），提出了基于沉降的RAP系统设计程序，其中确定了细长值和面积比。

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