Session 4B
ABSTRACT
The complexity of the three-dimensional (3D) arrangement of stone columns often necessitates simplifications into two-dimensional (2D) models using equivalent strength parameters for design purposes. This study proposes an expression to compute the equivalent block strength and investigates its validity by comparing factors of safety from 2D analyses with those from 3D numerical strip models that account for a realistic interaction between stone columns and surrounding soil.
Information on a real dam tailings stabilisation project is used. The modelling is done for three representative embankment sections under varied replacement ratios and soil conditions. Results show that the factors of safety (FoS) calculated from 3D simulations are in acceptable agreement with those derived from 2D limit equilibrium methods, and so, confirm the reliability of the equivalent strength approach for practical 2D designs. The study also highlights the potential for minor differences in failure mechanisms, emphasising the role of stress distribution and soil-column interactions.
AUTHORS
- Mauro Sottile, SRK Consulting
- Joe Rola, SRK Consulting
- Lisandro Roldan, SRK Consulting
- Alexandre Hubaut, Menard Oceania
- Alejo Sfriso, SRK Consulting
