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https://hdl.handle.net/2142/19807
Description
Title
Analysis of soil nailed retaining walls
Author(s)
Salama, Mohamed Elkhairy Ibrahem
Issue Date
1992
Doctoral Committee Chair(s)
Cording, Edward J.
Department of Study
Civil and Environmental Engineering
Discipline
Civil and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
A finite element (F.E.) computer program, SNAP, has been developed in this study. The analysis simulates the sequence of excavation and support of soil nailed retaining walls. The program contains isoparametric elements for the soil, beam elements for the wall facing and soil nails, and interface elements between the soil and the nails and between the soil and the wall facing. The subsequent analyses were conducted using a nonlinear-plasticity model with non-associated flow rule and both isotropic and kinematic hardening to simulate granular soil behavior. SNAP can simulate soil layers with different soil properties. The capability of the material model for simulating soil behavior has been demonstrated for triaxial compression, extension, transition from triaxial extension to compression and plane strain compression. The possible range of the values of the soil parameters used in the material model has been evaluated and correlated with soil density.
A full scale field test of a combined soil nailed and tieback wall has been analyzed using SNAP. Field measurements of the wall deformation and loads in the nails have been compared with the F.E. results. Contours of stresses have been presented. The F.E. analysis was used to compare the measured and predicted performance of soil nailed walls with ties and without ties. The influence of some of the soil model parameters on the prediction of the deformation and the ratio of the volume of surface displacements to the volume of the lateral displacements of the soil nailed wall has been compared with ratio obtained from the field test and the F.E. parametric study.
The parameters of nail length and, spacing and excavation height have been investigated for their influence on wall deformations and volume of lateral and vertical deformation and the results have been shown in a series of figures, for soil nailed walls without tiebacks. A suggestion has been made for the ratios of the length of the nails to the current height of the wall and the spacing between the nails to the current height of the wall required for certain displacement level as well as to achieve adequate global factor of safety.
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