The thickness of the deposits varies from less than 1m to over 50m, but standard thicknesses of 2 ÷ 3 m are very common. The loss and other soils susceptible to collapse are characterized by a complete absence of gravel or pebbles and by the fact that most of the material passes to the sieve No. 200. The specific weight varies within 2.6 ÷ 2.8 although most of the values are found within 2.65 ÷ 2.72.
Use of mixture during compaction (lime, volatile lime-ash or Portland cement). Adoption of measures ensuring that the land does not get wet and the use of poles to cross the yielding layer to a more compact underlying layer.
Soils subject to volume changes following wet-dry cycles are called dilatable soils handled by Perth Bore Services. These soils are found mainly in arid and semi-arid areas and contain a large quantity of clay minerals.
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