Open AccessDesign of reinforced cohesive soil walls accounting for wall facing contribution to stability
Author(s) -
Yara Barbosa Franco,
Stefano Utili,
Jefferson Lins da Silva
Publication year - 2023
Publication title -
géotechnique/geotechnique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.775
H-Index - 135
eISSN - 1751-7656
pISSN - 0016-8505
DOI - 10.1680/jgeot.21.00119
Subject(s) - reinforcement , geotechnical engineering , cohesion (chemistry) , retaining wall , limit analysis , stiffness , dimensionless quantity , soil water , parametric statistics , mechanically stabilized earth , structural engineering , engineering , materials science , finite element method , geology , mathematics , mechanics , chemistry , physics , statistics , organic chemistry , soil science
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.