Contemporary conceptual models for predicting carrying capacity of multi helices screw piles

Contemporary conceptual models for predicting carrying capacity of multi helices screw piles

Tahar Ayadat, Hocine Lefkir, Zahar Said Haddad, Danish Ahmed, Andi Asiz

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Abstract. Contemporary civil constructions are based on foundation systems consisting mainly of shallow, semi deep and deep foundations. The screw pile resembles essentially to a large screw that is inserted into the ground by a special machine. Basically, it acts as a foundation or an anchor. In general, it is composed of a central shaft and one or more graded steel helices. Screw piles have made great progress in recent decades, particularly when it comes to their axial capabilities and installation processes. Using screw piles for anchoring and supporting structures is advancing rapidly. Despite this, screw piles are still lacking design methods that require further research. This study consists on developing three conceptual models to predict the carrying capacity of a screw pile of multi helices. The first analytical model takes into account shaft friction, grooves’ geometry, and configuration of helices’ assembly. The second analytical model is based on the observed failure surface of screw piles proclaimed in literature. Whereas, the third empirical model considers the existing correlation between the torsional resistance generated during screw pile installation and its carrying capacity. The three models were validated against some actual testing results and some experimental data reported in literature. It was noted that the first analytical model underestimate the compressive carrying capacity of screw piles by about 5 to 15%. For the second model, a reasonable agreement was noted between the calculated and the measured results when the ratio L/B ≥ 10. However, in the opposite, the model overestimates the ultimate capacity of screw piles by about 15.3%. Likewise, the empirical model (third model) overestimates the tensile carrying capacity of screw piles by 10 to 20% with an average of 12.4%.

Screw Pile, Multi Helices, Axial Loading, Theoretical Model, Carrying Capacity

Published online 8/10/2023, 12 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Tahar Ayadat, Hocine Lefkir, Zahar Said Haddad, Danish Ahmed, Andi Asiz, Contemporary conceptual models for predicting carrying capacity of multi helices screw piles, Materials Research Proceedings, Vol. 31, pp 269-280, 2023


The article was published as article 28 of the book Advanced Topics in Mechanics of Materials, Structures and Construction

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

[1] Deng, R. F. Construction technique of half-screwed filling pile and its application in railway engineering. Railway Construction Technology 33(4): 84-87. (2016).
[2] Liu, Z. Application research of screw pile in deep fill foundation reinforcement. Resources Environment& Engineering 29(3): 323-326. (2015).
[3] Wan, P. Z. Key construction techniques and bearing behaviors of railway foundation treatment with screw pile in saline soil area. Railway Construction Technology 33(5): 82-86. (2016).
[4] Rao, S. N., Prasad Y.V.S.N. and Shetty M. D. The behavior of model screw piles in cohesive soils. Soils & Foundations 31(2): 35-50. (2008).
[5] Kurian, N.P., Shah, S.J. Studies on the behaviour of screw piles by the finite element method. Can. Geotech. J. 46 (6), 627-638. (2009).
[6] Sakr, M. Performance of helical piles in oil sand. Can. Geotech. J. 46 (9), 1046-1061. (2009).
[7] Meng Z., Chen J.J., Wang J.H. and Yin Z.Y. Study of model test on bearing capacity of screw piles in sand. Rock and Soil Mechanics 33(s1): 141-145. (2012).
[8] Stanier, S.A., Black, J.A. and Hird, C.C. Modelling helical screw piles in soft clay and design implications. Geotechnical Engineering 167(5): 447-460. (2014).
[9] Qian, J., Wang, B., Chen, H., and Huang, M. Model test and bearing mechanism study on grouting-screw uplift piles. Journal of Building Structures 36(10): 146-152. (2015).
[10] Lee C.W., Kim Y.S. and Park S.Y. Development of pre-bored screw pile method and evaluation of its bearing characteristics. Marine Georesources & Geotechnology 34(1): 42-56. (2016).
[11] Zahedi, P. and Soltani-Jigheh, H. A study of the bearing capacity of screw piles in sand. International Geotechnical Symposium, Istanbul, turkey, November. (2019).
[12] Karkush, M.O. and Hussein, A.A. Experimental Investigation of Bearing Capacity of Screw Piles and Excess Pore water Pressure in Soft Clay under Static Axial Loading, Second International Conference on Geotechnical Engineering, Iraq, Volume 318, (2021).
[13] Pack, J.S. Design of helical piles for heavily loaded structures. In: New Technological and Design Developments in Deep Foundations. American Society of Civil Engineers, USA, pp. 353-367. (2000).
[14] Sakr, M. Lateral resistance of high capacity helical piles: case study. In: Proceedings of the 63rd Canadian Geotechnical and 6th Canadian Permafrost Conference. Calgary, Alberta, 12-16 September, pp. 402-412. (2010).
[15] Perlow Jr., M. Helical pile acceptance criteria, design guidelines and load test verification. In: Geo-Frontiers 2011. American Society of Civil Engineers, USA, pp. 94-102. (2011).
[16] Livneh, B., Naggar, M.H.M. Axial testing and numerical modelling of square shaft helical piles under compressive and tensile loading. Can. Geotech. J. 45 (8), 1142-1155. (2008).
[17] Mohajeranin, A., Bosnjak, D., Bromwich, D. Analysis and design methods of screw piles: A review, Soils and Foundations, 56(1):115-128. (2016).
[18] Vito, D., Cook, T. Highly loaded helical piles in compression and tension applications: a case study of two projects. In: Proceedings of the Pan-Am CGS Geotechnical Conference, pp. 1-4.(2011).〈〉.
[19] Das, B. M. and Sivakugan, N. Principles of Foundation Engineering, 9th Edition, Cengage Learning, ISBN-13: 978-1-337-70503-5. (2019).
[20] IPENZ. Practice Note 28 Screw Piles: Guidelines for Design, Construction & Installation, e IPENZ Engineering Practice Advisory Committee, Version 1, October, (2015).
[21] Harnish, J.L. (2015). Helical Pile Installation Torque and Capacity Correlations, Electronic Thesis and Dissertation Repository. 2855. The University of Western Ontario,
[22] Mudge Fasteners, Inc. Determining Torque: The Facts About Required Torque, Tension and Clamp Loads, February, (2018).
[23] Tappenden, K. M. Predicting the Axial Capacity of Screw Piles Installed in Western Canadian Soils. Edmonton: The University of Alberta. (2007).
[24] European Standard (EN1926), European Committee for Standardization, Technical Committee CEN/TC 246Brussels, December (2006).