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Lookup NU author(s): Yara Franco,
Professor Stefano Utili
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2022 Thomas Telford Ltd.Where granular materials are not easily available, local cohesive soils are increasingly employed in geosynthetic reinforced soil walls as a cheap and sustainable option. Conventional design methods do not yet account for the beneficial effect of cohesion in reducing the amount of required reinforcement. Similarly, the contribution of the face to stability is rarely accounted for, despite plenty of experimental evidence in its favour. In this paper, a semi-analytical method based on limit analysis is developed for the design of reinforced soil walls in frictional-cohesive backfills accounting for the wall contribution. A parametric analysis was conducted to evaluate the effect of soil cohesion and friction angle, facing batter, block width, location of the reaction force acting on the face, facing-backfill interface friction, facing-foundation interface friction, and reinforcement length. Dimensionless design charts providing the required amount of reinforcement for lengths recommended in design standards are provided for both uniform and linearly increasing reinforcement distributions. It emerges that accounting for the presence of cohesion and the facing element can lead to significant savings in the overall level of reinforcement, and that tension cracks can be particularly detrimental to wall stability for highly cohesive soils so they cannot be overlooked in the design.
Author(s): Franco YB, Utili S, Da Silva JL
Publication type: Article
Publication status: Published
Print publication date: 01/08/2023
Online publication date: 24/03/2022
Acceptance date: 30/07/2021
Date deposited: 13/12/2022
ISSN (print): 0016-8505
ISSN (electronic): 1751-7656
Publisher: ICE Publishing
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