Numerical Simulations of Soil Nailing Applied to Urban Excavations Considering the Effect of Post Grouting-Video

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Video Summary

The presentation examines numerical simulation of sectorized post-grouted soil nails for urban excavations. In this Brazilian technique, grout is injected through multiple hoses after initial grouting, improving soil–nail interface resistance; studies have reported gains of at least 50%. A 19.2-meter retaining wall in sandy silt, reinforced with closely spaced nails, was monitored using inclinometers and extensometers. Conventional simulations predicted 43 mm of wall displacement, far above the measured maximum of 2.1 mm. Modeling the nail tips as fixed to represent stronger post-grouted interaction produced results closer to field observations, suggesting the technique can enable soil nailing in tall, challenging excavations.

Keywords

sectorized post-grouted soil nails

numerical simulation

urban excavations

retaining wall displacement

soil-nail interface resistance