ASDSO Dam Safety Toolbox

Support of Excavation

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Construction of deep excavations must be made prior to a modification to the existing structure or new structure can be built. When excavations have the potential to endanger lives or adjacent properties, bracing to support the soil must be designed. Excavation support systems are temporary earth retaining structures that allow the sides of excavation to be cut vertical or near vertical. Excavation support systems are typically top/down construction consisting of vertical h-pile or micro-pile supports with wood or concrete lagging using tieback anchoring systems. This minimizes the excavation area by keeping the sides of deep excavations stable and ensure that movements will not cause damage to neighboring structures or to utilities in the surrounding ground. This is done to minimize the size of an excavation; when space is limited by property lines, utilities or existing structures. In large construction areas where space isn’t an issue, excavation walls may be sloped, instead of providing structural support.


Revision ID: 7486
Revision Date: 07/28/2023