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

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The presentation examines numerical simulations of soil nailing for an urban excavation in São Paulo, Brazil, with a focus on sectorized post grouting. The analysis uses the Singh and Babu (2009) procedure, incorporating an initial-stress (K₀) approach and the Mohr–Coulomb soil model. The authors modify the method to represent fully anchored nails, allowing for stronger interaction between the nails and surrounding soil.<br /><br />The case study defines geotechnical properties for four soil layers, along with parameters for the excavation facing and nails. Plaxis 2D simulations compare conventional soil nailing with a sectorized post-grouting configuration.<br /><br />The reported excavation displacements are approximately 0.012% of the excavation height (H), which the presentation identifies as serviceable. This is below the 0.1–0.3% H range cited from FHWA (2003). The authors suggest that the low displacements may result from the greater soil–nail interface resistance provided by post grouting.

Keywords

soil nailing

numerical simulation

urban excavation

São Paulo

sectorized post grouting

Singh and Babu 2009

K0 approach

Mohr-Coulomb model

Plaxis 2D

geotechnical displacement