Improving Anchor Uplift Capacity in Sand Using Geogrid Reinforcement

What is it about?

Anchor-type foundations, used in structures subject to tensile forces, are typically designed based on soil weight and frictional resistance. This study examines the potential of using geogrid material to increase the uplift capacity of strip anchor plates without increasing their burial depth. Experiments using a centrifugal setup and numerical analyses were conducted on sand with different densities and embedment ratios (H/B = 2 and H/B = 5). Results showed that using geogrid significantly enhanced uplift capacity, with a single geogrid layer inclined at 45 degrees proving most effective. Uplift capacity increased by up to 98% with reinforcement, and a comparison between experimental and numerical results indicated good compatibility. Practical suggestions are offered based on these findings.

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Photo by Etienne Girardet on Unsplash

Photo by Etienne Girardet on Unsplash

Why is it important?

This research is important because it addresses the challenge of increasing the uplift capacity of foundation anchors without the need for deeper embedment, which can be both costly and impractical. By exploring the use of geogrid materials, the study aims to provide a more economical and efficient solution for enhancing the performance of infrastructure subjected to tensile forces, such as towers, offshore structures, and buried pipelines. The findings could lead to significant improvements in the design and construction of foundations, ensuring better stability and safety while reducing construction costs. Key Takeaways: - The uplift capacity of anchor plates can be significantly improved by using geogrid materials. Specifically, a single geogrid layer placed just above the anchor plate at a 45-degree angle proved to be the most effective, resulting in uplift capacity increases of up to 98%. - The experimental results showed that the uplift capacity of anchors in dense sand increased by 19% and 55% for embedment ratios H/B = 2 and H/B = 5, respectively, without geogrid reinforcement. With geogrid reinforcement, these increases were even more pronounced. - Numerical analysis using a finite element method confirmed that the experimental results were reliable, as both methods yielded compatible outcomes. This validation supports the practical application of using geogrid to enhance uplift capacity in various soil conditions.