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Chilliwack Fire Department, Chilliwack B.C.

Ground improvement with RIC at Chilliwack fire hall site

Subgrade soils for this site consisted of silty sands and sand with silt. The Rapid Impact Compactor was used as a remedial ground improvement option, with the expectation that the upper 10 to 15 feet would be treated, with a cone depth of about 12 inches. However, typical cone depth (depth of impact crater) was on the order of 3 feet, with an improvement in the blow count from 12 to 20 at a depth of 30 feet! Average overall ground deformation (subsidence) resulting from the RIC process averaged 18 inches. As a result, the building's foundation design was modified, resulting in a significant cost savings for the project.

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