CMH Building B
CMH Building B
Project Details:
Owner: Amazon Web Services
General Contractor: Walbridge
Dates of Work: November 2022 to December 2022
Engineer: Kimley Horn (Civil); HKS Inc. (Structural); GCI (Geotechnical)
Approximate Key Quantities: Stone Columns 3,059 EA.
Project Overview:
Due to the compressible nature of the soils at the site, Menard USA was contracted to provide ground improvement – the selected technique was stone columns.
Ground Conditions:
Solution:
For adjacent structures, undercuts of 10-ft or more were implemented to address soft and saturated soils. The soil required moisture treatment before replacement, which added significant time and cost to the project schedule. To minimize the costs and avoid such delays, Walbridge approached Menard to develop an alternative ground improvement solution – an excavate-and-replace method.
To address the soil at the immediate surface, Walbridge utilized lime kiln dust to moisture-treat fills that were needed to reach the finished floor elevation. Menard designed and installed stone columns to increase bearing capacity and provide settlement control for the building.
The stone columns were installed to depths of 13 ft to 14 ft beneath the building slabs, footings, and generator and equipment pads. The stone column solution was designed to support footings sized for 3,000 psf. The design also supported a slab live load of 440 psf. The design provided for 1-in of post-construction settlement with a differential settlement of less than a ½-in, meeting the performance criteria of the building.
Menard successfully installed 3,059 stone columns to support a new data center in New Albany, OH.
