Axial bearing capacity of helical piles in moist and saturated conditions using frustum confining vessel (FCV)

Document Type : Research

Authors

1 PhD Candidate, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Assistant Professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

3 Professor, Department of Civil and Environment Engineering, Amirkabir University, Tehran, Iran

Abstract

Due to the increasing demand in construction and use of different types of piles on the one hand, and the high cost of conducting large-scale tests on different types of piles, on the other hand, new methods have been proposed to study the behavior of different types of piles. Physical modeling provides the researcher the capability of studying model piles in the scaled environment at low costs. Among the different methods of physical modeling, the use of frustum confining vessels (FCV) have gained attraction in recent years. FCV is a cone-shaped vessel that can produce a stress distribution similar to the idealized linear stress distribution in depth. Helical piles are common types of deep foundations which their first usage dates back to about 200 years ago. Helical piles are driven to the soil by applying a torque to the end of piles, in the presence of vertical loads. Their quick and noise-free installation method, the minimal disturbance during the installation, and their environmental compatibility make them popular for working in urban areas. In this research, FCV apparatus with optimal dimensions were designed and constructed. A total of 18 compression tests were performed on Anzali sand in different relative densities and moisture contents using single-helix and three-helices piles. Results indicate that increasing the number of helices and soil relative density increases the pile and sand contact and causes higher bearing capacity for helical piles. Soil saturation, on the other hand, significantly reduces the ultimate strength.

Keywords

Main Subjects

Numerical Methods in Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 02 December 2022

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History

  • Receive Date: 25 June 2022
  • Revise Date: 19 November 2022
  • Accept Date: 02 December 2022

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