The effect of water injection pressure on the performance of conical helical piles

Document Type : Research Article

Authors

1 Assistant Professor of Science and Research branch of Azad University

2 Department of Civil Engineering, Science and Research Branch, Islamic Azad University

3 Department of Civil and Environmental Engineering, Amirkabir University of Technology

Abstract

Loess deposits exist in some areas of Golestan Province, and the type of sedimentation of these deposits has caused a loose honeycomb structure with low density, which is the cause of geotechnical and structural challenges. There are several solutions for improving such problematic soils, one of which is the use of conical helical piles. In this study, eight three-blade conical helical piles with a length of 6.2 m and a blade-to-diameter ratio of 3, under installation stresses of 200-400-450 kPa in two dry and wet conditions, were used to improve the performance of loess soil located at the Dashli Borun site in Golestan Province. In the dry method, the piles were installed and loaded under three stresses, and in the wet method, the optimal water injection pressure was first determined, and then the performance of the piles was examined. The results show that with increasing installation stress, the capacity of conical piles in both dry and wet states increases, and the injection pressure is an effective parameter on the behavior of these types of piles, and non-use of optimal water injection pressure causes a 45% reduction in the pile's bearing capacity.

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Amirkabir Journal of Civil Engineering
Volume 57, Issue 5
August 2025
Pages 851-870

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