- Ideal for caving soils
- Rapid installation (schedule savings)
- 20-50% savings versus deep foundations and over-excavation
- No spoils and haul-off costs
The Geopier Impact® system is our solution to soils that simply won’t stay open during drilling. Impact piers are a displacement type system that uses a steel pipe mandrel outfitted with a patented compaction chamber to penetrate through caving soils and construct piers from the bottom up. This installation method allows for the construction of high-quality Rammed Aggregate Piers (RAPs) below the groundwater table without having to worry about contamination and/or fouling of the aggregate. The end result is a dense column of aggregate surrounded by stiffened matrix soils that provide excellent settlement control and allow for higher bearing capacities.
• Caving sands below the groundwater table and soft squeezing clays and silts
• Organic soils after the addition of grout to the aggregate
• Liquefiable soils
Geopier Impact® piers are installed by advancing a displacement mandrel through unsuitable soils to a desired design depth. Once at depth, the mandrel is withdrawn several feet to allow open-graded aggregate to flow into the annular space. The mandrel is then redriven to create a densified 2-foot-thick lift of aggregate. These steps are repeated up to the ground surface to create a dense column of aggregate surrounded by stiffened matrix soils.
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