We were called in on a project near Circular Quay where a 15-meter basement excavation sat just meters from a heritage sandstone wall. The owner had an architectural vision but no geotechnical design for the deep excavation. We stepped in with a staged approach: first, we ran a site investigation using cimentaciones superficiales to understand the bearing capacity of the underlying Hawkesbury Sandstone, then modeled the excavation sequence to keep lateral displacements under 10 mm. That project finished on time and without a single crack in the adjacent building. That is the kind of outcome we deliver routinely across Sydney.
A deep excavation design without site-specific ground investigation is just a guess. In Sydney, the difference between sandstone and clay can mean millions in extra shoring cost.