How are Geopier RAPs different than stone columns?
Geopier RAPs are similar to stone columns in that they are both composed of aggregate replacement columns. Except that Geopier RAPs are 10 to 25 times stiffer than stone columns. This means that Geopier RAPs can carry much higher loads than stone columns and they also improve the surrounding soil much better. Stone columns create a weak mudded zone at the perimeter. Geopier RAPs create a well compacted rough perimeter with aggregate that has been rammed and embedded into the adjacent soil.
