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| Slab Jacking
and Void Grouting | Case Study |
Project: Renovation of Ivy Farms Apartments, Newport
News, Virginia
• Architect- Burkhart Thomas, P.C.
• Geotechnical Engineer- Herbert and Associates, Ltd.
• Structural Engineer- Donald Coghlan P.C.
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General Contractor- Beacon Construction Company
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Financing- Virginia Housing Development Authority
Description- The apartment complex was built
over a landfill around 1960. The project consists of one hundred
and forty-four, two story, wood framed apartment units that
have brick veneer exteriors. The exterior walls are on pilings
with concrete grade beams. The interior slabs are floating
on grade construction. There is severe to moderate interior
settlement and voids between the slabs and sub-soils.
Solution- Herbert and associates recommended slab
jacking and pressure grouting for the problem areas. Advanced
Builders, Inc. designed an injection schedule and a layout
grid to complete the following . . .
Slab Jacking and Void Grouting-
• Apartments- 54 total
• Foyer/ Entrance Halls- 1 total
Pressure Grouting to 11' Below Grade-
• Apartments- 7 total
• Foyer/ Entrance Halls- 1 total
A total of 396 cubic yards of stabilizing cementitious grout
was utilized for the jacking and grouting process, which filled
the voids and achieved corrections of the slabs with lifts
as great as 8".
Exterior Problems- Several of the units showed
signs of exterior settlement, which consisted of cracking
of the foundation and masonry veneers. The solution was to
install Magnum 3" steel piers, with heavy-duty Magnum
angle brackets. The piers were installed 6' on center, as
directed by the Architect, to stop further settlement and
stabilize the affected areas.
• Magnum Piers Installed- 38 total
• Average Depth- 39' deep
• Average Ultimate Bearing Capacity- 30 kips
• Average Working Bearing Capacity- 15 kips |
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