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Pullout resistance of inclined anchors embedded in geogrid reinforced sand
Geotextiles and Geomembranes ( IF 5.2 ) Pub Date : 2021-06-01 , DOI: 10.1016/j.geotexmem.2021.05.009
Sougata Mukherjee , Lucky Kumar , Awdhesh Kumar Choudhary , G.L. Sivakumar Babu

Transmission tower foundations experience large vertical uplift forces during their lifetime. These forces can be resisted by providing anchor foundations below the tower. In this study, laboratory experiments were conducted to investigate the pullout capacity of inclined plate anchors in dry sand. The capacity of inclined anchor significantly improved in the presence of geogrid reinforcement on top of the anchor plate. Besides, the pullout capacity increased with the inclination angle (30°, 45°, 60°) both in unreinforced and reinforced soil. It was observed that the ultimate pullout load is significantly influenced by the embedment depth of the anchor plate and relative density of the backfill material. The experimental results were compared with a three-dimensional numerical model developed in FLAC3D. The comparison shows good agreement between the experimental and numerical results, and the numerical model can predict the pullout behaviour of the inclined anchor plate both in unreinforced and reinforced soil. Comparison of uplift resistance of pile and anchor foundations are shown through a design example of a transmission tower foundation. Results indicate that inclined anchors embedded in reinforced soil can resist the uplift forces at shallow depth compared to piles.



中文翻译:

土工格栅加筋砂斜锚杆抗拔力研究

输电塔地基在其生命周期中会经历巨大的垂直提升力。这些力可以通过在塔下方提供锚地基础来抵抗。在这项研究中,进行了实验室试验以研究斜板锚在干砂中的拉拔能力。在锚板顶部存在土工格栅加固的情况下,斜锚的承载力显着提高。此外,在未加筋和加筋土中,拔出能力随着倾斜角(30°、45°、60°)的增加而增加。据观察,极限拔出载荷受锚固板的嵌入深度和回填材料的相对密度的显着影响。实验结果与开发的三维数值模型进行了比较F一种C3D. 比较表明,实验结果与数值结果吻合良好,数值模型可以预测斜锚板在未加筋和加筋土中的拔出行为。通过输电塔基础的设计实例展示了桩基础和锚基础抗拔力的比较。结果表明,与桩相比,嵌入加筋土中的斜锚可以抵抗浅层的上拔力。

更新日期:2021-07-28
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