Yes! There are multiple ways to construct Geopier elements below the groundwater elevation. Temporary casing may be added with the drilled solutions. Alternatively, one of the displacement Geopier systems may be used to allow for aggregate delivery at the bottom of patented system mandrels to ensure that rock is placed at the appropriate elevations.
Yes! If the organic content is low (such as buried topsoil), then a Rammed Aggregate Pier® system may be installed through this layer to tag the underlying native soils. If the organic content is high, then a rigid inclusion technology will likely be required provide confinement and limit settlements. We have several rigid inclusion systems including cement treated aggregate piers, Armorpact® piers, grouted Impact® piers, and GeoConcrete® Columns.
The Geopier system is not intended to specifically mitigate shrink/swell potential, but the use of Geopier elements with high bearing pressure foundations will reduce the effect of expansive soil. The geotechnical engineer’s recommendation for expansive soils should still be followed including proper drainage and grading.
Piers can be installed before or after the placement of grade raise fill. Both sequencings have their merits with respect to cost, schedule, etc. We will work with you to figure out what is best for your project.