Similar concept to the wet stone column method, Dry stone column is not using water instead using compressed air as in the dry method. They are particularly useful if washout of soil to the surface is to be prevented or where handling of process water for the Wet Top Feed method is problematic.
The conventional dry method is suited for firmer soils with a relatively low ground water table (FHWAA, 1983). However, the main controlling factor is the availability of a nearby source of water for wet method. Otherwise, it would be the dry method. While The wet method is generally used where the “borehole” stability is questionable. Hence, it is suited for sites underlain by very soft to firm soils and a high ground water table.
Installation of stone columns by bottom feed dry method