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Do circular slurry wall shafts require bracing?

Circular and some elliptical shafts, constructed as slurry walls, typically require no internal bracing. Unbraced foundation excavations offer cost and scheduling advantages over conventionally braced excavations. Typically, the entire structure behaves as a self supporting compression ring. However, for very large diameters, in excess of 200’, the structure behaves more like a thin shell structure, which may not accommodate deviations caused by typical construction tolerances and internal ring beams may be required.  

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