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Determination of the depth of the interface between wind sand and cemented sand of the Gilbraltar rock

  • Complex tasks
  • Geotechnical surveys

Slope stability diagnosis

Gibraltar

Contracting authority :          Edmond NUTTAL (UK)

The Rock of Gibraltar, on the Mediterranean side, had a slope covered with metal sheets used to collect rainwater.

Before the removal of these sheets and perpendicular nailing, the aim was to define the thickness of the wind sand, accumulated over time in a significant thickness (of the order of 3 to 5 metres), and slightly cemented against the rock face (consolidation at the limit of equilibrium).

The Panda®, used over the entire surface (operator secured by rappel) gave full satisfaction with the expected results, and thus made it possible to determine the interface between this cemented sand and the natural sand making up this slope.

The correlation qd Panda® and the undrained Cu cohesion also gave an idea of the stability of the slope.

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