Skip to main content

Research Repository

Advanced Search

Performance of circular footings on sand by use of multiple-geocell or -planar geotextile reinforcing layers

Moghaddas Tafreshi, S.N.; Sharifi, P.; Dawson, Andrew

Authors

S.N. Moghaddas Tafreshi

P. Sharifi

Andrew Dawson



Abstract

This paper describes a series of reduced scale tests, at unit gravity, performed on circular footings supported by reinforced sand. Reinforcement by multiple layers of geocell was investigated and performance of the footing was compared to one on the same sandy soil containing multi-layered planar geotextile reinforcement. The comparison used geocell and geotextile layers formed from the same parent geosynthetic material having the same characteristics but with less mass of geocell. Results show that the reinforcements’ efficiency (described in terms of the load carrying and subgrade modulus enhancement) decreased as the number of layers increased. In tests at moderate and low footing settlements, significant improvements in bearing capacity and subgrade modulus were obtained with the application of three layers of geocell. On the whole, multi-layered geocell-reinforced soil provides a more effective and much stiffer system that can deliver greater foundation loads and subgrade modulus, as compared to the multi-layered planar-reinforced soil, even when less parent geosynthetic material is used in the multi-layered geocell arrangement. Furthermore, reinforcement benefit is achievable at settlements as small as 0.2-0.4% of footing diameter for the geocell installations whereas settlements 4 to 5 times larger are needed before benefit is gained from a comparable planar geotextile system. To achieve comparable performances, the multi-layered geocell requires 1/4 to 1/2 the mass of geosynthetic material as needed in the form of a multi-layered planar geotextile reinforcement (depending on the settlement allowable). The multi-layered geocell reinforcement needs considerably less parent geosynthetic (reducing transport and, perhaps supply costs) and reduces the size of reinforcement zone required, consequently reducing excavation and the amount of backfill required.

Citation

Moghaddas Tafreshi, S., Sharifi, P., & Dawson, A. (2016). Performance of circular footings on sand by use of multiple-geocell or -planar geotextile reinforcing layers. Soils and Foundations, 56(6), 984-997. https://doi.org/10.1016/j.sandf.2016.11.004

Journal Article Type Article
Acceptance Date Jul 27, 2016
Publication Date Dec 5, 2016
Deposit Date Aug 1, 2016
Publicly Available Date Dec 5, 2016
Journal Soils and Foundations
Print ISSN 0038-0806
Electronic ISSN 0038-0806
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 56
Issue 6
Pages 984-997
DOI https://doi.org/10.1016/j.sandf.2016.11.004
Keywords Multi-layered geocell; Multi-layered geotextile; Bearing pressure; subgrade modulus; Circular footing
Public URL https://nottingham-repository.worktribe.com/output/787286

Files

Performance of circ footings on reinf sand - Final 28-7-16.pdf (606 Kb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





You might also like



Downloadable Citations