Modelling installation of helical anchors in clay
Modelling installation of helical anchors in clay
复制标题
粘土中螺旋锚杆的安装建模
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Gaudin
中科院分区：
文献类型：
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作者：
C. Todeshkejoei;J. Hambleton;Xu Stanier;C. Gaudin
螺旋锚杆是一种通过旋转安装在地面上的深基础，主要用于抵抗上拔。尽管安装过程起着中心作用，特别是关于土壤扰动的影响，但人们对安装过程中发生的力和变形知之甚少。一个例外是被称为扭矩-能力关联的现场验证技术，该技术试图将安装扭矩与提升能力直接联系起来。然而，由于并不是所有的重要参数，如安装垂直力和螺旋螺距，都被考虑在内，所以这种方法还存在一些悬而未决的问题。这可能是文献中报道的广泛的扭矩相关系数背后的主要原因之一。本研究对粘土中螺旋锚杆的安装过程进行了三维数值分析。结果被综合成方便的屈服包络，该包络预测安装扭矩与法向力之间的关系，作为螺距、粗糙度和厚度的函数。文中还讨论了这些结果在力矩-容量关联中的应用。©2015 Taylor&Francis Group，伦敦。
Helical anchors, which are mostly used to resist uplift, are deep foundations installed by rotation into the ground. Despite the central role of the installation process, especially with respect to the effect of soil disturbance, relatively little is known about the forces and deformations occurring during installation. An exception is the field verification technique known as torque-capacity correlation, which attempts to relate installation torque directly to uplift capacity. However, there are open questions regarding this approach, since not all significant parameters, such as installation vertical force and helix pitch, are taken into consideration. This could be one of the main reasons behind the wide range of torque-correlation factors reported in the literature. This study presents a three-dimensional numerical analysis of the installation process for helical anchors in clay. The results are synthesised into convenient yield envelopes that predict the relationship between installation torque and normal force as functions of helix pitch, roughness, and thickness. The application of the findings to torque-capacity correlation is also discussed. © 2015 Taylor & Francis Group, London.