Investigation of the Effect of Helix Diameter and Number of Helical Plates on Bearing Capacity by Model Tests

Year 2025, Volume: 1 Issue: 2, 95 - 105, 31.07.2025

Yunus Cerit , Murat Örnek

Abstract

Helical piles are a type of pile used in many areas of geotechnical engineering. Helical piles are often preferred over traditional piles because they can resist many forces such as compression, tension, and lateral loads. In this study, the bearing capacity behavior of helical piles under compression in loose sand soil was investigated by designing model tests in a laboratory environment, and the load-displacement curves were interpreted. In these tests, the embedded pile length (L), shaft diameter (d), and helix spacing (s) were kept constant. The helix diameter (D) and the number of helical plates (N) were considered as variable parameters. The test results showed that the bearing capacity increased as the helix diameter and the number of helices increased.

Keywords

Helical Pile , Helical Plate Diameter , Helical Plate Number , Bearing Capacity

Helis Çapı ve Helisel Plaka Sayısının Taşıma Gücüne Etkisinin Model Deneylerle Araştırılması

Abstract

Helisel kazıklar geoteknik mühendisliğinin birçok yerinde kullanılan bir kazık türüdür. Helisel kazıklar basınç, çekme ve yanal gibi birçok kuvvete karşı koyabildiğinden geleneksel kazıklara göre daha çok tercih edilir. Bu çalışmada gevşek kum zeminde ve basınç etkisi altında helisel kazıkların taşıma gücü davranışı laboratuvar ortamında model deneyler tasarlanarak incelenmiş ve yük deplasman eğrileri yorumlanmıştır. Bu deneylerde gömülü kazık boyu (L), şaft çapı (d) ve helis aralığı (s) sabit tutulmuştur. Helis çapı (D) ve helisel plaka sayısı (N) değişken parametreler olarak ele alınmıştır. Deney sonuçları helis çapı ve helis sayısı arttıkça taşıma kapasitesinin de arttığını göstermiştir.

Keywords

Helisel Kazık , Helisel Plaka Çapı , Helisel Plaka Sayısı , Taşıma Gücü

References

• Yılmaz, B. 2016. Helisel kazıklar. İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Yüksek Lisans Tezi, 165s, İstanbul.
• Sakr, M. 2009. Performance of helical piles in oil sand. Canadian Geotechnical Journal, 46(9), 1046-1061.
• Perko, H. A., 2009. Helical Piles: A Practical Guide to Design and Installation. John Wiley & Sons, New Jersey, 512
• Vijayalakshmi, R. 2019. Analysis of Helical Piles with Case Study in Medium Stiff Clay. Indian Journal of Science and Technology, 12(6), 1-10.
• Türedi, Y., Örnek, M. 2020. Analysis of model helical piles subjected to axial compression. Gradevinar, Journal of the Croatian Association of Civil Engineers, 72(9), 759-769.
• Li, W., Deng, L. 2019. Axial load tests and numerical modeling of single-helix piles in cohesive and cohesionless soils. Acta Geotechnica, 14(2), 461-475.
• Türedi, Y., Emirler, B., Örnek, M., Yıldız, A. 2023. Helisel Kazıklarda Helis Çapının Basınç Yüküne Etkisinin Laboratuvar Deneyleri ile Araştırılması. Çukurova Üniversitesi Mühendislik Fakültesi Dergisi, 38(4), 1013-1022.
• Sakr, M. 2012. Installation and performance characteristics of high-capacity helical piles in cohesive soils. DFI Journal – The Journal of the Deep Foundations Institute, 6(1), 41-57.
• Hussein, M. M. 2013. Numerical and Experimental Modeling of Helical Piles. Zagazig University, Faculty of Engineering, Master thesis, 137
• Nowkandeh, M. J., Choobasti, A. J. 2021. Numerical study of single helical piles and helical pile groups under compressive loading in cohesive and cohesionless soils. Bulletin of Engineering Geology and the Environment, 80(5), 4001-4023.
• Malik, A. A., Kuwano, J. 2020. Single Helix Screw Pile Behavior Under Compressive Loading/Unloading Cycles in Dense Sand. Geotechnical and Geological Engineering, 38(5), 5565-5575.
• Bashiri, M., Ghazavi, M., Bourne-Webb, P. J. 2024. Small-scale physical modelling of vertically loaded, cyclically thermally-activated helical piles. Geomechanics for Energy and the Environment, 40, 100589.
• Lutenegger, A. J. 2011. Historical Development of Iron Screw-Pile Foundations: 1836-1900. The International Journal for the History of Engineering & Technology, 81(1), 108-128.
• Thusa, C. H. C., Aoki, N., Rault, G., Thorel, L., Garnier, J. 2012. Evaluation of the efficiencies of helical anchor plates in sand by centrifuge model tests. Canadian Geotechnical Journal, 49(9), 1102-1114.
• Emirler, B. 2024. Physical and Finite Element Models for Determining the Capacity and Failure Mechanism of Helical Piles Placed in weak Soil. Applied Sciences, 14(6), 2389.
• Kunduz, S. 2020. Gevşek zeminlerde yanal yüklü helisel kazık davranışının laboratuvar deneyleriyle araştırılması. İskenderun Teknik Üniversitesi, Lisansüstü Eğitim Enstitüsü, Yüksek Lisans Tezi, 92s, Hatay.
• Mursal, U. 2022. Kum Zemine Gömülü Helisel Kazıklarda Örselenme Etkisinin Sayısal Olarak İncelenmesi. Çukurova Üniversitesi, Fen Bilimleri Enstitüsü, Yüksek Lisans Tezi, 161s, Adana.
• Kurniawan, Y., Iqbal, M. M., & Dewi, R. 2016. Effect of Helical Geometry on the Axial Compressive Capacity. International Journal of Innovative Science and Research Technology, 5(6), 717-723.
• Türedi, Y. 2021. Basınç yüküne maruz helisel kazık davranışının laboratuvar ve arazi deneyleri ile araştırılması. İskenderun Teknik Üniversitesi, Lisansüstü Eğitim Enstitüsü, Doktora Tezi, 194s, Hatay.
• Bak, J., Choi, B. H., Lee, J., Bae, J., Lee, K., Kim, D. 2019. Behaviour of single and group helical piles in sands from model experiments. 2nd International Conference on Building Materials and materials Engineering (ICBMM 2018), 278.
• George, B. E., Banerjee, S., Gandhi, S. R. 2019. Helical piles installed in cohesionless soil by displacement method. International Journal of Geomechanics, 19(7), 04019074.