Over excavation
The term 'excavation' refers to the process of removing earth to form a cavity in the ground, typically to allow a below-ground structure to be constructed.
The term ‘over excavation’ refers to an excavation that goes beyond the depth required for the formation of a below-ground structure.
This might be necessary for example if the ground conditions at the level that the below-ground structure will be constructed do not have sufficient stability or load-bearing capacity to support that structure. In this case the excavation must be taken to a deeper, more stable level, the unsuitable material removed, the ground at the lower level may need to be treated to ensure it has suitable load-bearing capacity, then the excavation back-filled to the required level with suitable compacted fill.
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Five signs you are at risk.
Biotechnology as it applies to the built environment.
Stopping sound coming through windows.
Government response to the Building a Safer Future consultation.
The real cost of BREEAM Excellent
Energy savings quickly payback any small additional capital investment.
Overbuild and air-space developments.
Airports National Policy Statement and its impact on infrastructure.
A quick introduction to the elements of effective site messaging.
Project 13 partners with World Economic Forum
Organisations will collaborate on infrastructure initiatives.
Technology informs procurement and planning practices.
Industrial gas boiler market update
BSRIA releases market sector growth projections.
Designing for durability and resilience.