Vertical Cutting Edge Forces Measured During the Sinking of Pneumatic Caisson

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Abstract
During the construction of the pneumatic caissons supporting the towers of the Youngjong Grand Bridge in South Korea, the cutting edge of the Incheon side caisson was equipped with a number of strategically positioned reaction force gauges to measure vertical cutting edge contact pressures and to assess the contact pressure distribution developed during caisson sinking through a range of ground conditions. The magnitude of the contact pressure and its distribution under a foundation varies depending principally upon the physical properties of the founding material, foundation dimensions and the rigidity of the foundation construction. This requires the designer to make an engineering judgment based on the results of the site investigation and the rigidity of the foundation.

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