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Design of geosynthetic - reinforced slopes in cohesive backfills

Lookup NU author(s): Akram (PGR) Abd, Professor Stefano Utili

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

Currently, geosynthetic reinforcements for slopes are calculated assuming the ground strength to bepurely frictional, i.e. without any cohesion. However, accounting for the presence of even a modestamount of cohesion could allow using locally available cohesive soils as backfills to a greater extent andless overall reinforcement. But cohesive soils are subject to the formation of cracks that tend to reduceslope stability so their presence has to be accounted for in the design of the slope reinforcement. In thepaper, limit analysis was employed to derive a semi-analytical method for uniform c  f slopes thatprovides the amount of reinforcement needed as a function of ground cohesion, tensile strength, angle ofshearing resistance and of the slope inclination. Both climate induced cracks as well as cracks that formas part of the slope collapse mechanism are accounted for. Design charts providing the value of therequired reinforcement strength and embedment length are plotted for both uniform and linearlyincreasing reinforcement distributions.From the results, it emerges that accounting for the presence of cohesion allows significant savings onthe reinforcement to be made, and that cracks are often significantly detrimental to slope stability sothey cannot be overlooked in the design calculations.


Publication metadata

Author(s): Abd A, Utili S

Publication type: Article

Publication status: Published

Journal: Geotextiles and Geomembranes

Year: 2017

Volume: 45

Issue: 6

Pages: 627-641

Print publication date: 01/12/2017

Online publication date: 05/09/2017

Acceptance date: 08/08/2017

Date deposited: 29/09/2017

ISSN (print): 0266-1144

Publisher: Elsevier

URL: https://doi.org/10.1016/j.geotexmem.2017.08.004

DOI: 10.1016/j.geotexmem.2017.08.004


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