Unconsolidated Soil: Backfill
Soil is called backfill, if “it has been artificially placed”.
Backfill is divided into:
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Non-compacted fillings of any composition
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Compacted fillings of non-cohesive or cohesive soil types or inorganic filling material (e. g. building rubble, slag, ore residues), whenever the fillings have been sufficiently compacted
Image:
Compacted backfill under a motorway [Source: STEIN Ingenieure GmbH]
Most of the areas below the surface of traffic ways and centre islands, as well as the backfilled utility trenches of existing sewers, are composed of backfill, thus, they require special attention.
