Dynamic Compaction ~ this method of ground improvement
consists of dropping a heavy weight from a considerable height and
is particularly effective in granular soils. Where water is present in
the subsoil, trenches should be excavated to allow the water to
escape and not collect in the craters formed by the dropped
weight. The drop pattern, size of weight and height of drop are
selected to suit each individual site but generally 3 or 4 drops are
made in each position forming a crater up to 2„500 deep and
5„000 in diameter. Vibration through the subsoil can be a problem
with dynamic compaction operations therefore the proximity and
condition of nearby buildings must be considered together with the
depth position and condition of existing services on site.Soil Stabilisation and Improvement