A three-dimensional numerical comparison of bearing capacity and settlement of tapered and under-reamed piles

Article

Vali, Ramin, Mehrinejad Khotbehsara, Elham, Saberian, Mohammad, Li, Jie, Mehrinejad, Mojdeh and Jahandari, Soheil. 2019. "A three-dimensional numerical comparison of bearing capacity and settlement of tapered and under-reamed piles." International Journal of Geotechnical Engineering. 13 (3), pp. 236-248. https://doi.org/10.1080/19386362.2017.1336586
Article Title

A three-dimensional numerical comparison of bearing capacity and settlement of tapered and under-reamed piles

ERA Journal ID40355
Article CategoryArticle
AuthorsVali, Ramin (Author), Mehrinejad Khotbehsara, Elham (Author), Saberian, Mohammad (Author), Li, Jie (Author), Mehrinejad, Mojdeh (Author) and Jahandari, Soheil (Author)
Journal TitleInternational Journal of Geotechnical Engineering
Journal Citation13 (3), pp. 236-248
Number of Pages13
Year2019
Place of PublicationUnited States
ISSN1938-6362
1939-7879
Digital Object Identifier (DOI)https://doi.org/10.1080/19386362.2017.1336586
Web Address (URL)https://www.tandfonline.com/doi/full/10.1080/19386362.2017.1336586
Abstract

Tapered piles by top cross sections larger than the toe cross sections and under-reamed piles by having one or more bulbs, have the potential for substantial major sides over conventional straight-sided piles. Most of the studies on tapered and under-reamed piles have been conducted on the experimental side, while, theoretical studies, such as finite element method, have been mainly confined to conventional straight-sided piles. On the other hand, although several field, laboratory and experimental studies have been conducted to study the behaviour of tapered and under-reamed piles, few numerical studies have been carried out to simulate the behaviour of the piles. In addition, there is no research to compare and evaluate behaviour of these two piles due to different geotechnical and geometrical properties. Therefore, the aim of this study was to numerically investigate bearing capacity and settlement of tapered and underreamed piles by changing the soil type, cohesion, angle of internal friction, the length and diameter of piles, tapering degree and the number of bulbs using finite element method. Based on the FEM results, it was found that by increasing the values of geotechnical and geometrical properties, bearing capacity of the tapered pile was more than that of the under-reamed one (i.e. settlement of tapered pile was less than that of the under-reamed one). The reason for this trend could be attributed to increasing contact surface area, friction resistance and more adhesion between soil and the tapered pile. In addition, bulb number of under-reamed piles and tapering degree of tapered piles had significant effects on settlement and bearing capacity of the piles.

Keywordstapered pile; under-reamed pile; bearing capacity; settlement; finite element method; geotechnical properties; geometrical properties
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400599. Civil engineering not elsewhere classified
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Byline AffiliationsMohajer Technical University of Isfahan, Iran
Islamic Azad University, Iran
Royal Melbourne Institute of Technology (RMIT)
Centre for Future Materials
Graduate University of Advanced Technology, Iran
Institution of OriginUniversity of Southern Queensland
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