Foundation inspections are carried out following excavation but prior to pouring concrete to confirm that ground conditions and geotechnical properties are the same as those to which the foundations have been designed.
Foundation inspections might be carried out where ground conditions are particularly variable, where unexpected ground conditions have been encountered, where the bearing capacity is particularly critical and/ or where an inspection might result in less conservative foundation design/ construction.
Foundation inspections might include in-situ testing, e.g. hand shear vane or plate bearing testing.
A bearing capacity will normally be provided. Re-design of foundations is sometimes necessary/ recommended.
Foundation Inspections Reduce Construction Costs, East Devon
Ruddlesden geotechnical are currently undertaking foundation inspections on a plot-by-plot basis for a regional housing developer at a new residential development site in East Devon.
The consulting engineer had specified that all foundations be reinforced to accommodate local changes in the ground conditions, identified in the original geotechnical investigation.
However, following a reduction in site levels, the majority of footings were to be founded in the relatively more homogenous underlying Dawlish Sandstone Formation and, where not encountered, it was found to be more cost effective to deepen foundations into the Dawlish Sandstone Formation, rather than reinforcing shallower footings, founded in the overlying superficial deposits.
Ruddlesden geotechnical are responsible for providing an account of the ground conditions encountered in each foundation excavation and specifying whether further excavation (or reinforcement) is required for each plot.