Vibro-Replacement (aka Stone Columns or Aggregate Piers)
Vibro-Replacement (aka Stone Columns or Aggregate Piers) using the Wet Top Feed method. This method is commonly used on sandy sites. Water flowing around the tool keeps the hole open in soils that would otherwise cave, allowing the stone backfill to be added from the ground surface.
Video source:https://youtu.be/7SSzmeDtKuY . Earth Tech.
Instagram video: https://www.youtube.com/watch?v=gPyzJjSf5qk