DFI Journal - The Journal of the Deep Foundations Institute
Volume 18, Issue 2, November 2024
DOI: 10.37308/DFIJnl.20230824.293
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A Behavior Comparison of Grouted and Screw Nailed Walls in Sandy and Clayey Soils
Article Type: Research Paper
Zahedi, P., et al.
Abstract
The study investigated the behavior of walls reinforced by screw and grouted nails in both sandy and clayey soils, along with examining the interaction between screw nails and the surrounding soil. Results indicated that the cylindrical mechanism of screw nails diminishes the influence of soil-shaft interaction on pullout resistance. Abaqus/Standard software faces difficulty in resolving slope stability issues when employing the penalty method to mimic screw nail-soil interface behavior. Modeling the interaction of screw nails and surrounding soil as an embedded region within the soil in Abaqus/Standard software is suggested. Passive stresses acting on the soil behind screw plates enhanced the horizontal stress behind the plates. Vertical and horizontal displacements of walls reinforced with screw nails were smaller than those of grout-nailed walls in sandy soils. Additionally, the effectiveness of screw nails in controlling horizontal displacement of reinforced walls increased with higher surcharge loads. However, there was no significant difference observed in associated values in clayey soils. For optimal effectiveness, it is advisable to use screw nails in soils with smaller Rankine zones (higher internal friction angle values) or with a minimum number of screw plates within the Rankine zone.
Keywords:
crew nail, grouted nail, abaqus-3D, sandy soil, clayey soil, screw nail interaction