Numerical study of the effects of bed resistance and groundwater conditions on the behavior of geosynthetic reinforced s
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ORIGINAL PAPER
Numerical study of the effects of bed resistance and groundwater conditions on the behavior of geosynthetic reinforced soil walls Vahed Ghiasi 1
&
Amin Farzan 1
Received: 15 October 2017 / Accepted: 31 October 2019 # Saudi Society for Geosciences 2019
Abstract Due to the difference in the behavior of the reinforced soil wall on a compressible or loose bed, relative to rigid bed, investigating the behavior of this system on a compressible bed is considered necessary. In this research, the behavior of geogrid reinforced soil seated on a bed with different resistance parameters and different groundwater levels, using finite element method for the analysis of deformation and forces, and limits equilibrium method for checking wall stability, has been evaluated. Also, the effect of the wall height in two categories with a height of 4 and 8 m is considered and evaluated. The result showed that reducing the resistance parameter bed of reinforced soil wall would lead to increase lateral displacement of the wall and tensile load of the geogrids, and to reduce the wall’s stability. Also, as the surface of groundwater level closer to the below of the reinforced soil wall, the lateral displacement of the wall will be more and the overall stability of the wall will be less, and this effect of groundwater on the wall’s behavior is significant at a distance of 0 to 1 m below the wall. Keywords Reinforced soil wall . Geosynthetic . Bed condition . Finite element method . Limit equilibrium
Abbreviations E Stiffness modulus Eurref Unloading/reloading stiffness E50ref Secant stiffness in standard drained triaxial test Eoedref Tangent stiffness for primary oedometer loading m Power for stress-level dependency of stiffness Rf Failure ratio qf/qa γ Unit weight υ Poisson’s ratio EOC End of construction
Introduction The low soil tensile strength is a major limitation in soil structure, while this limitation can be resolved by reinforcing the Responsible Editor: Zeynal Abiddin Erguler * Vahed Ghiasi [email protected]; [email protected] 1
Department of Civil Engineering, Faculty of Civil and Architecture Engineering, Malayer University, Malayer, Iran
soil in a reinforced soil wall system. Geosynthetic reinforced soil walls over the past two decades around the world are considered to be very popular and widely used due to many benefits, such as economic savings, accelerate in construction, apparent beauty, and more flexible than conventional walls, such as gravity walls (Bilgin 2009; Jackson 2010). Among the applications of the geosynthetic reinforced soil wall can be expressing the maintenance of embankments, bridges abutment, and the widening and maintenance of roads or railroads in areas where differences in height exist (Koerner and Soong 2001). Generally, reinforced soil walls are composed of three parts, the backfill, facing, and the reinforcement. The mechanism of the reinforced soil walls is based on the interaction between the reinforcement and the soil, which prevents the soil against ruptures. Investi
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