Project:
Sector – Manufacturing Storage Facility, River soil
Location – Cape Girardeau, Missouri
Application(s) – Vibratory Stone Columns (VSCs) / Aggregate Piers

Project Description:
A company in Cape Girardeau, Missouri, was adding a new storage facility at their existing manufacturing site. The sub-surface conditions generally consisted of a lean clay fill material to a depth of approximately 3 feet. The material below the fill consisted of high plastic clays approximately 9 to 18 feet thick. Below the high plastic clay was 5 to 13 feet layer of silt. This site was close to the Mississippi River and wetlands area.

Project Requirements & Challenges:
The design for this new facility required the stone columns and continuous footings to have a bearing pressure of 1300 psf and the floor slab was 230 psf. The maximum long-term settlement was less than 1 inch and the maximum differential settlement was less than a half an inch.

Solution:
Based on the sub-surface conditions and the design requirements, Helitech chose Vibratory Stone Columns (VSCs) as the ground improvement method. Helitech installed vibratory stone columns to a depth of 20 feet under the column and continuous footings. In the floor slab area, Helitech installed VSCs to a depth of 10 feet. Overall, Helitech installed over 1,600 Vibratory Stone Columns to support the new foundation and floor slab.

Result:
Helitech performed load tests to validate the design and installation of the Vibratory Stone Columns. The all load tests had deflections ranging from 0.14 to 0.25 inches.

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