For the larger warehouse Menard originally proposed DC. However, the effects of vibrations associated with DC on a nearby residential neighborhood became a concern after Menard’s initial proposal was offered. Menard found that the incorporation of RIC would impart enough energy into the soil to provide adequate densification while minimizing disturbances to the residential neighborhood.
Several ground improvement options were considered for the construction of the smaller warehouse, including aggregate piers and piles. CMC rigid inclusions were selected as the most appropriate solution to improve the soil based on Menard’s experience with similar projects, construction schedule, and cost-effectiveness. The presence of the thicker, organic layer made DC and RIC a less desirable option for ground improvement because a surcharge and waiting period would have been needed to increase the rate of settlement of the compressible materials. Menard’s solution of CMC rigid inclusions to improve the ground saved the client money over traditional foundations, such as piles, and was a better technical fit than aggregate piers. The CMC rigid inclusions could also be installed in the vicinity of an existing utility line that was sensitive to vibration. Menard installed more than 1,000 CMC rigid inclusions at depths up to 42 ft to support the foundation of the smaller warehouse.
This project required the coordination of multiple techniques to be implemented simultaneously, in complex soil conditions and over large areas. Secondary settlement of the organic peat layer was of concern and was addressed in Menard’s design. Confirmatory borings for the larger warehouse and a load test for the CMC rigid inclusions in the smaller warehouse were performed to verify the design parameters.