A Case Study of the Behavior of Large-Scale Helical Piles in Fine-Grained Soils

Ali Eslampanahi¹ Soheil Ghareh²

1) 1. Ph.D. Student of Civil Engineering- Geotechnics, Islamic Azad University, Science and Research Branch, Tehran,
2) Associate Professor, Department of Engineering, Payam-e-Noor University, Tehran, Iran,

IOI Code : XCCE-EECAG
Publication : 2nd International Congress On Engineering, Technology and Innovation(eticong.com/2nd)
Abstract :
    Helical piles are one of the new tools of geotechnical science. From an engineering point of view, these types of piles can be used for different structures and structures with problematic infrastructures. To this end, this paper reviews the studies of load-bearing capacity quantification in both the field and numerical conditions in real dimensions. In the first part of this study, large-scale helical piles were constructed with lengths of 3, 6, and 9 meters with a number of helices of different diameters. To implement these piles, a site in the western part of Mashhad containing fine-grained soils was selected and compressive and tensile load tests were performed. Besides, pressure grouted helical piles (PGHPs) were then tested. In the second part of this paper, the numerical method is applied based on soil-structure interaction corresponded to the field tests of Plaxis 3D 2018 software. Finally, the results of field and software studies are presented. These results show that field studies in compressive and tensile modes are about 85% and 90% of the results of numerical modeling based on real conditions, despite the complexity of the soil and the limitations of numerical modeling. Compressive load-bearing capacity values of the results of the field tests of grouted piles are about 50% of the values of ungrouted piles. Furthermore, given the piles were constructed and tested with different lengths and diameters, shows that the helix diameter has a greater effect on the load-bearing capacity results than the pile length, according to the FHWA method

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