Ohio State University Apartments Aggregate Piers

Project
Sector – Government Facility
Location – Ohio State University, Columbus, OH
Application(s) – Aggregate Piers / VSCs and Vibro Concrete Piers / VCCs for Ground Improvement

Description
A residential housing design consisting of six new residential buildings was proposed on a site with poor upper soils.

Requirements & Challenges
Three of the new buildings required a 7000 psf bearing pressure. In order to reach this bearing pressure, Helitech was selected to install an Aggregate Pier/VSC Ground Improvement design.
In addition to the poor soils, there were many project challenges, including a shale shelf that ran through site from two to ten feet below bottom of footing.
Access was limited not only due to the tight urban setting, but there were four additional buildings being constructed simultaneously alongside Helitech’s job site. This affected the daily delivery of rock for the aggregate columns.

Solution & Results
Helitech worked to install approximately 1,000 Aggregate Piers to meet the design requirements of 7000 psf with less than one inch of total settlement, and less than a half an inch of differential settlement. Helitech validated the design and installation by performing full scale load tests and plate load tests.