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Critical length of encased stone columns
Geotextiles and Geomembranes ( IF 5.2 ) Pub Date : 2021-05-30 , DOI: 10.1016/j.geotexmem.2021.05.003
Marina Miranda , Jesús Fernández-Ruiz , Jorge Castro

Encased stone columns are vertical inclusions in soft soils formed by gravel wrapped usually with a geotextile. Their critical length is the one where further lengthening of the column provides a negligible improvement and it is therefore not effective to build columns longer than it. This paper aims to obtain common values of the critical length using simplified two-dimensional axisymmetric and full three-dimensional finite element analyses. A uniform soft soil layer with a linear elastic perfectly plastic behaviour is considered for the sake of simplicity. For the studied cases, the critical column length is around 1.3–2.5 times the footing diameter for encased stone columns, and slightly lower for ordinary stone columns, namely around 1.1–1.9. The critical length of the encasement is found to be slightly lower than the critical column length. The value of the critical column length is related to the extent of plastic deformation and that may be used to decide the column length in the design phase without the need of parametric analyses. As a first approximation, a general value of the critical column length of 2 and 2.5 times the footing diameter may be considered for ordinary and encased stone columns, respectively.



中文翻译:

包围石柱的临界长度

包裹石柱是软土中的垂直夹杂物,由通常用土工布包裹的砾石形成。它们的临界长度是进一步加长柱子提供的改进可以忽略不计的长度,因此建造比它更长的柱子是无效的。本文旨在使用简化的二维轴对称和全三维有限元分析来获得临界长度的常用值。为简单起见,考虑具有线性弹性完美塑性行为的均匀软土层。在研究案例中,围岩柱的临界柱长约为基础直径的1.3-2.5倍,普通石柱的临界柱长略低,约为1.1-1.9。发现外壳的临界长度略低于临界柱长度。临界柱长的值与塑性变形的程度有关,可用于在设计阶段确定柱长,而无需进行参数分析。作为第一个近似值,对于普通石柱和包封石柱,可以分别考虑临界柱长度的 2 倍和 2.5 倍基础直径的一般值。

更新日期:2021-07-28
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