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Advancements in Deep Foundations: Augered Cast-In-Place Piles

Located in downtown Fargo, North Dakota, the Block 9 Redevelopment project site contains highly-compressible soils in the upper 100 feet with groundwater about 10 to 15 feet below the existing ground surface. The owner prohibited using driven piles to avoid disturbing neighbors of the project and historically, drilled shafts are used in Fargo as a reduced noise and vibration alternative to driven piles.

However, developments over the last 20 to 30 years in drilling equipment, load testing and integrity testing resulted in the project team identifying augered cast-in-place piles as a suitable alternative for this project. To reduce the risks associated with using a relatively unproven foundation system in the area, the project team used the design-build delivery method for foundation design and construction. The team also specified compression load testing and higher-than-normal integrity testing. A successful bi-directional load test validated the design parameters for the augered cast-in-place pile while thermal integrity profiling gave the team confidence that these piles would perform similarly to the test pile.

To read more about how our team tested the performance of a relatively unproven foundation system in this project’s geography, please fill out the form below to download a complete copy of our white paper.

Matthew Glisson Principal, Principal Engineer

P: 314.569.9883