Abstract

In the present study, the uplift capacity of the under-reamed piles (also referred to as belled piles) in the sand was determined by following a finite element analysis. In this regard, the soil was assumed to obey Mohr-Coulomb's failure criteria, together with a non-associated flow rule. The pile geometry, soil, and pile properties were selected by following relevant literature. The friction angle (ϕ) of sand varied from 25°-45°, whereas the embedment ratio (L/D) of the pile was kept between 7.0-17.5. The computed uplift capacity was expressed in a non-dimensional manner. After comparison of uplift capacity with literature, an analytical equation to predict the uplift capacity of under-reamed\belled piles was developed using the generated failure patterns from numerical analysis. The proposed equation was validated using 300 datasets from literature which includes field and laboratory test both. The uplift capacity estimated with the developed equation correlates well with literature as the R² value in all the cases was greater than 0.99.

摘要

在本研究中，通过有限元分析确定了扩孔桩（也称为扩孔桩）在沙中的抗拔能力。在这方面，假定土壤遵循 Mohr-Coulomb 失效准则以及非关联流动规则。根据相关文献选择桩的几何形状、土壤和桩特性。沙子的摩擦角（φ）在25°-45°之间变化，而桩的埋入比（L/D）保持在7.0-17.5之间。计算的提升能力以无量纲方式表示。在将抗拔能力与文献进行比较后，利用数值分析生成的失效模式，开发了一个预测扩孔/扩孔桩抗拔能力的解析方程。使用来自文献的 300 个数据集验证了所提出的方程，其中包括现场和实验室测试。用所开发的方程估计的抬升能力与文献有很好的相关性，因为 R²值在所有情况下均大于 0.99。