Numerical Study of Helical Piles in Sandy Soils Under Vertical and Lateral Loads

Subject Areas : Analysis of Structure and Earthquake

Farhad Nabizadeh ¹ , Ali Zahmatkesh ^{2 *} , Amirhosin Moslemi ³

1 - Department of Civil Engineering<Chaloos branch,Islamic Azad Univercity<Chaloos, Iran
2 - Department of Civil Engineering, Ferdows branch, Islamic Azad University, Ferdows, Iran
3 - Islamic Azad University, Chaloos, Iran

Received: 2024-12-16 Accepted : 2025-04-09 Published : 2025-05-19

Keywords: Helical pile, Helical blade, Bearing capacity, Shaft diameter ,

Abstract :

The application of screw piles as a deep foundation type has increased significantly in recent years. The increasing use of helical piles can be attributed to their unique advantages, including relatively low construction and installation costs compared to other foundations, the ability to install in different soils without the need for measures such as casing, curing and maintenance (as is required for concrete piles), and the lack of need for pre-drilling. This research investigated the bearing capacity of piles by numerical modeling of 9 piles with spiral blades. By drawing load-displacement diagrams and comparing them at a constant settlement value, the bearing capacity has been calculated. The results indicated that the bearing capacity of the structure increased with increasing the shaft diameter and the number of pile blades. According to the results, the shaft diameter has a greater impact on the bearing capacity than the number of blades. The best performance of the helical spark plug system was related to the three-blade spark plug model with a diameter of 25 mm.

References:

[1] Perlow JM. Helical Pile Acceptance Criteria, Design Guidelines, and Load Test Verification. Geo-Frontiers Adv. GeotechnicalEngineering.2011;94-102. https://doi.org/10.1061/41165(397)11
[2] Cerato AB, Victor R. Effects of Long-Term Dynamic Loading and Fluctuating Water Table on Helical Anchor Performance for Small Wind Tower Foundations. Journal of Performance of Constructed Facilities. 2009; 23:251-61 https://doi.org/10.1061/(ASCE)CF.1943-5509.0000013
[3] Vesic AS. Breakout resistance of objects embedded in ocean bottom. Journal of Soil Mechanics and Foundation Division.1971;1183-1205. https://doi.org/10.1061/JSFEAQ.0001659
[4] Wang L, Zhang P, Ding H, Tian Y, Qi X. The uplift capacity of single-plate helical pile in shallow dense sand including the influence of installation. Marine Structures.2020; 71, 102697 . https://doi.org/10.1016/j.marstruc.2019.102697
[5] Garakaki AA, Maleki J. Load Capacity of Helical Piles with Different Geometrical Aspects in Sandy and Clayey Soils: A Numerical Study. In International Congress and Exhibition Sustainable Civil Infrastructures. 2019; Springer, Cham, 73-84. https://doi.org/10.1007/978-3-030-34178-7_7
[6] Ghosh P, Samal S. Ultimate pullout capacity of isolated helical anchor using finite element analysis. In Soil Dynamics and Earthquake Geotechnical Engineering. 2019; Springer, Singapore. 237-245. https://doi.org/10.1007/978-981-13-0562-7_26
[7] Abbas HO, Ali OK. Comparing the axial performance of screw pile with ordinary piles in soft clay layer overlaying sandy soil. In Modern Applications of Geotechnical Engineering and Construction. 2021; Springer, Singapore. 119-132. https://doi.org/10.1007/978-981-15-9399-4_11
[8] Bak HM, Halabian AM, Hashemolhosseini, H, Rowshanzamir M. Axial response and material efficiency of tapered helical piles. Journal of Rock Mechanics and Geotechnical Engineering. 2021; 13(1), 176-187.‏ https://doi.org/10.1016/j.jrmge.2020.04.007
[9] Fayez AF, El Naggar MH, Cerato AB. Assessment of SSI effects on stiffness of single and grouped helical piles in dry sand from large shake table tests. Bulletin of Earthquake Engineering. 2021; 1-40.‏ https://doi.org/10.1007/s10518-021-01257-z
[10] Saleem HD, Aldefae AH, Mearek SM. Effect of Wing Ratio of Single Helix Screw Pile on Ultimate Compression Capacity Embedded in Cohesionless Soil. In Geotechnical Engineering and Sustainable Construction, 2022; Springer, Singapore.‏ 367-378. https://doi.org/10.1007/978-981-16-6277-5_29

[11] فلاحپور، محمد؛ شوش پاشا، عیسی. ارزیابی ظرفیت باربری قائم شمع تحت بار جانبی در خاک ماسه‌ای بابلسر. دومین همایش ملی مهندسی سازه ایران، تهران، دانشگاه صنعتی امیرکبیر، 1394. شناسه ملی کنفرانس: ISSEE02،
https://www.symposia.ir/ISSEE02
[12] نافع پسند، بهنام؛ هادیانی، نوید؛ اقبالی، امیر حسین. تحلیل ظرفیت باربری پیچشی گروه شمع‌های مایل تحت بارهای جانبی برون محور. کنفرانس بین‌المللی عمران، معماری و مدیریت توسعه شهری در ایران، تهران، 1397. شناسه ملی کنفرانس: CAUM01،
https://cum2018.com.siteindices.com/
[13] معمار، میثم؛ زمردیان، سید محمدعلی؛ وکیلی، امیرحسین. بررسی اثر شکل مقطع شمع در ظرفیت باربری جانبی گروه شمع در خاک ماسه‌یی. مجله مهندسی عمران شریف، دوره 36، شماره 3، 1399 :47-39 . https://doi.org/10.24200/j30.2019.53173.2536
[14] نبی زاده، سید فرهاد؛ جانعلی زاده؛ عسکر ، مطالعه آزمایشگاهی و صحرایی عملکرد شمعهای پیچی در خاک ماسه‌ای ،نشریه مهندسی سازه و ساخت، دوره3، شماره3 ، 1395: 5-15.
https://doi.org/10.22065/jsce.2016.40247