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Comparative Analysis of Helical Piles and Granular Anchor Piles for Foundation Stabilization in Expansive Soil: A 3D Numerical Study

Author

Listed:
  • Ammar Alnmr

    (Department of Structural and Geotechnical Engineering, Széchenyi István University, 9026 Győr, Hungary)

  • Richard Paul Ray

    (Department of Structural and Geotechnical Engineering, Széchenyi István University, 9026 Győr, Hungary)

  • Rashad Alsirawan

    (Department of Structural and Geotechnical Engineering, Széchenyi István University, 9026 Győr, Hungary)

Abstract

This study investigates the performance of granular anchor piles and helical piles in expansive soils. Expansive soils pose challenges for engineering due to their significant swelling and shrinkage characteristics. Special considerations are required for constructing foundations on expansive soil to mitigate volumetric changes. While helical piles provide uplift resistance in light structures, they may not fully stabilize foundations in expansive soils. In contrast, granular anchor piles offer a simpler alternative for resisting uplift forces. A numerical study was conducted to analyze the pullout loads, compressive loads, and heave behavior of these anchor techniques. The results demonstrate that granular anchor piles outperform helical piles in terms of pullout and compressive performance, with improvements ranging from 17% to 22.5% in pullout capacity and 0.5% to 19% in compressive capacity, depending on specific pile lengths and diameters examined. However, both techniques show similar effectiveness in reducing heave, achieving reductions of over 90% when specific conditions are met. Additionally, the use of high-rise cap piles contributes to significant heave reduction, effectively minimizing heave to nearly negligible levels compared to low-rise cap piles. It is found that the relative density of the granular material has a more pronounced effect on the pullout load compared to the compressive load, and its impact varies depending on the length of the pile. Therefore, it is recommended to avoid high relative density when the pile is entirely within the expansive soil while utilizing higher relative density is beneficial when the pile penetrates and settles in the stable zone.

Suggested Citation

  • Ammar Alnmr & Richard Paul Ray & Rashad Alsirawan, 2023. "Comparative Analysis of Helical Piles and Granular Anchor Piles for Foundation Stabilization in Expansive Soil: A 3D Numerical Study," Sustainability, MDPI, vol. 15(15), pages 1-36, August.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:15:p:11975-:d:1210191
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    References listed on IDEAS

    as
    1. Carlos J. Medina-Martinez & Luis Carlos Sandoval-Herazo & Sergio A. Zamora-Castro & Rodrigo Vivar-Ocampo & David Reyes-Gonzalez, 2022. "Natural Fibers: An Alternative for the Reinforcement of Expansive Soils," Sustainability, MDPI, vol. 14(15), pages 1-21, July.
    2. Bikash Devkota & Md Rajibul Karim & Md Mizanur Rahman & Hoang Bao Khoi Nguyen, 2022. "Accounting for Expansive Soil Movement in Geotechnical Design—A State-of-the-Art Review," Sustainability, MDPI, vol. 14(23), pages 1-27, November.
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