Three-Dimensional Lower Bound Solutions for Stability of Plate Anchors in Clay
Three-Dimensional Lower Bound Solutions for Stability of Plate Anchors in Clay
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DOI：
10.1061/(asce)1090-0241(2003)129:3(243
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发表时间：
2003-03
影响因子：
3.9
通讯作者：
R. Merifield;A. Lyamin;S. Sloan;Hai-Sui Yu
中科院分区：
文献类型：
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作者：
R. Merifield;A. Lyamin;S. Sloan;Hai-Sui Yu
土锚通常被用作需要提升或横向阻力的结构的基础系统。这些类型的结构包括输电塔、板桩墙和埋地管道。虽然锚通常形状复杂（例如，拖曳或螺旋锚），但许多先前的分析将锚理想化为平面应变条件下的连续条形。这种假设具有数值上的优势，可以在二维空间中求解。与以往的数值研究不同，本文采用三维数值极限分析方法来评价锚杆形状对不排水粘土中水平锚杆拉拔能力的影响。锚被理想化为正方形、圆形或长方形。根据极限分析的下界定理的有限元公式，采用一种新开发的三维数值计算方法，得到了极限拉拔载荷的估计。这个公式假设了一个完全塑性土壤模型和一个Tresca屈服准则。结果以常见的基于不同锚固形状和嵌入深度的破裂因子形式呈现，并与现有的数值解和经验解进行了比较。
Soil anchors are commonly used as foundation systems for structures that require uplift or lateral resistance. These types of structures include transmission towers, sheet pile walls, and buried pipelines. Although anchors are typically complex in shape (e.g., drag or helical anchors), many previous analyses idealize the anchor as a continuous strip under plane strain conditions. This assumption provides numerical advantages and the problem can be solved in two dimensions. In contrast to recent numerical studies, this paper applies three-dimensional numerical limit analysis to evaluate the effect of anchor shape on the pullout capacity of horizontal anchors in undrained clay. The anchor is idealized as either square, circular, or rectangular in shape. Estimates of the ultimate pullout load are obtained by using a newly developed three-dimensional numerical procedure based on a finite-element formulation of the lower bound theorem of limit analysis. This formulation assumes a perfectly plastic soil model with a Tresca yield criterion. Results are presented in the familiar form of break-out factors based on various anchor shapes and embedment depths, and are also compared with existing numerical and empirical solutions.