Laboratory Investigation of behavior of Helical piles under monotonic loading at different loading speeds

Articles in Press

Document Type : Research Note

Authors

1 master's degree student of geotechnical engineering, Faculty of Civil Engineering of Shahrood University, Shahrood

2 School of Civil & Architectural Engineering, Shahrood University of Technology

3 Ph.D Student of geotechnical engineering of Shahid Beheshti University, Tehran, Iran.

10.24200/j30.2024.64018.3300

Abstract

Today, one of the primary challenges faced by geotechnical engineers in dealing with problematic soils is to choose a suitable improvement method that, in addition to strengthening the soil, does not cause harmful damage to the environment. Helical piles are a new method that has become very popular in recent years due to the unique features of this type of pile, the most important of which is that it is environmentally friendly. Due to their unique shape and section (having one or more helixes along the shaft of the pile), Helical piles have a higher load capacity than usual concrete piles. Among the advantages of using this type of piles, it can be a short installation time with minimal noise and vibration (no need to vibrate for installation), is Easy to implement due to limited access, lightweight, reduction of disturbance soil during installation, and less environmental risks and compatible with nature.

According to past studies, it has been found that the current knowledge of the performance of this type of piles and the methods of predicting and determining the bearing capacity currently need to be improved, and this shows the necessity of researching the behavior of these piles.

This research, to predict the tensile behavior of Helical piles under different loading speeds and also to investigate the addition of a second helix to a single-helix Helical pile, using the 1g physical modeling device, in two cases of high (95%) and low (45%) relative densities has been studied.

The results obtained in this study show that the effect of relative soil compaction on improving the bearing capacity of the soil was more significant than the loading speed and the number of helixes. According to the results of the monotonic tests, the final bearing capacity decreased by about 56% with increasing loading speed; on the other hand, by increasing the relative density and increasing the number of helixes, the final load capacity increased, respectively about 468% and 54%.

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Sharif Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 19 March 2025

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