Developing an Efficiency Equation for Tapered Pile Groups in Sand Using Mathematical and Numerical Analyses

Shafaghat, A; Khabbaz, H; Fatahi, B

Developing an Efficiency Equation for Tapered Pile Groups in Sand Using Mathematical and Numerical Analyses

Shafaghat, A

Khabbaz, H Fatahi, B

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Publisher:: Springer
Publication Type:: Conference Proceeding
Citation:: Advances in Urban Geotechnical Engineering Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions -- Nanchang, China, 2021, 2021, pp. 16-30
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Shafaghat, A https://orcid.org/0000-0003-4424-5475
dc.contributor.author	Khabbaz, H
dc.contributor.author	Fatahi, B https://orcid.org/0000-0002-7920-6946
dc.date	2021-07-19
dc.date.accessioned	2022-06-24T04:04:01Z
dc.date.available	2022-06-24T04:04:01Z
dc.date.issued	2021-01-01
dc.identifier.citation	Advances in Urban Geotechnical Engineering Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions -- Nanchang, China, 2021, 2021, pp. 16-30
dc.identifier.isbn	9783030801519
dc.identifier.issn	2366-3405
dc.identifier.issn	2366-3413
dc.identifier.uri	http://hdl.handle.net/10453/158347
dc.description.abstract	This study presents a new simple equation for prediction of pile group efficiency considering the effect of tapering angle in cohesionless soil under vertical loading. Firstly, a simple analytical relationship based on the mathematical definition of the pile group efficiency is developed. However, the effect of tapering angle is captured by defining a new geometry efficiency coefficient associated with the shaft vertical bearing component of tapered piles. Thereafter, a mathematical equation is developed by taking into account the shaft vertical bearing ratio and the new geometry efficiency coefficient. On the other hand, a numerical analysis is performed for modelling a single bored cylindrical pile and a tapered pile with the same volume as well as bored tapered pile groups to validate the proposed mathematical equation. The UBC sand constitutive model is adopted for the modelling of piles in loose Cambria sand. Subsequently, the load-displacement diagrams of single and group of piles are obtained. Then, the bearing capacities of cylindrical and tapered bored piles both as single and group are computed and compared, using a specific settlement criterion. Besides, the friction resistance ratio and the shaft vertical bearing ratio are separated, applying numerical methods. Having calculated the ratios of various components of bearing capacity, pile group efficiencies can be obtained from both numerical and mathematical models. The results show that the proposed equation can predict the pile group efficiency incorporating the tapering angle as well as other influencing parameters as a simple and novel relationship.
dc.language	en
dc.publisher	Springer
dc.relation.ispartof	Advances in Urban Geotechnical Engineering Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions -- Nanchang, China, 2021
dc.relation.ispartof	GeoChina International Conference
dc.relation.ispartofseries	Sustainable Civil Infrastructures
dc.relation.isbasedon	10.1007/978-3-030-80152-6_2
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Developing an Efficiency Equation for Tapered Pile Groups in Sand Using Mathematical and Numerical Analyses
dc.type	Conference Proceeding
utslib.location.activity	China
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Teaching and Learning)
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-06-24T04:03:58Z
pubs.finish-date	2021-07-21
pubs.publication-status	Published
pubs.start-date	2021-07-19

Abstract:

This study presents a new simple equation for prediction of pile group efficiency considering the effect of tapering angle in cohesionless soil under vertical loading. Firstly, a simple analytical relationship based on the mathematical definition of the pile group efficiency is developed. However, the effect of tapering angle is captured by defining a new geometry efficiency coefficient associated with the shaft vertical bearing component of tapered piles. Thereafter, a mathematical equation is developed by taking into account the shaft vertical bearing ratio and the new geometry efficiency coefficient. On the other hand, a numerical analysis is performed for modelling a single bored cylindrical pile and a tapered pile with the same volume as well as bored tapered pile groups to validate the proposed mathematical equation. The UBC sand constitutive model is adopted for the modelling of piles in loose Cambria sand. Subsequently, the load-displacement diagrams of single and group of piles are obtained. Then, the bearing capacities of cylindrical and tapered bored piles both as single and group are computed and compared, using a specific settlement criterion. Besides, the friction resistance ratio and the shaft vertical bearing ratio are separated, applying numerical methods. Having calculated the ratios of various components of bearing capacity, pile group efficiencies can be obtained from both numerical and mathematical models. The results show that the proposed equation can predict the pile group efficiency incorporating the tapering angle as well as other influencing parameters as a simple and novel relationship.

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http://hdl.handle.net/10453/158347