Metro Point – One Bell Drive

Project Details:

Owner: Sitex Group
General Contractor: RC Andersen, LLC
Duration of Work: 6 weeks
Subsurface Conditions: Upper layer of historic fill over a layer of soft, highly compressible organic peat
Approximate Key Quantities: 560 prints of Dynamic Compaction, 1,900 prints of Rapid Impact Compaction, 1,066 Controlled Modulus Column (CMC)® Rigid Inclusions

Project Overview:

One Bell Drive is an industrial complex located in Ridgefield, New Jersey that is composed of two new distribution warehouses. Investigations of the site’s soils revealed an upper layer of historic fill over a layer of soft, highly compressible organic peat. The presence of the organic peat layer was of great concern to project engineers due to the large settlements that were expected to occur following the construction of the two warehouses. The concerning soil layers also varied in thickness between the two sites of the proposed warehouses. To reduce anticipated settlement and improve the unique ground conditions under each warehouse foundation, Menard proposed an innovative ground improvement solution that combined several proven techniques, including Controlled Modulus Column (CMC)® rigid inclusions, dynamic compaction (DC) and rapid impact compaction (RIC).

In addition to these techniques being an economical alternative to aggregate piers and traditional pile support,they were implemented simultaneously which saved the client considerable schedule duration.

Ground Conditions:

The larger warehouse covered an area of approximately 195,000 sq. ft and the fill layer extended from 0 to 8 ft below the existing grade. Below the fill was a thin layer of soft organic peat extending from 8 to 10 ft, and underneath the organic peat layer was a stratum of silty sand from 10 to 60 ft grading from loose to medium dense to dense. The thin organic layer was present in small quantities and not close to the surface.

The smaller warehouse covered an area of approximately 83,000 sq ft. While the general soil profile at this location was similar to that of the larger warehouse, the organic peat layer was thicker and closer to the surface at a depth of 5 to 8 ft below grade.

Solution:

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