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GEC Sinkhole Services

GEC Project: FDOT I-4/Maitland Boulevard
Interchange Stabilization Project

Starting December 2008, the Florida Department of Transportation (FDOT) will begin work to prepare the Maitland Boulevard interchange on Interstate 4 for future improvements as part of the Ultimate I-4 project.

  • The stabilization will take place just east of the eastbound I-4 lanes at an existing retention pond within the interchange.

  • The stabilization process will take 18 to 24 months to complete.

  • The cost of the project is estimated to be $14 million.

 

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The Pine Hills Sinkhole

GEC rapidly developed unique engineering solutions to protect two 3-story structures
from the largest sinkhole to occur in Central Florida in 20 years.

View the Pine Hills Sinkhole Video

View sinkhole slideshow

Pine Hills Sinkhole
(image courtesy of Giken America Corp.)

The Pine Hills Sinkhole project was spotlighted in the Summer 2003 Pile Driver Magazine
Pile Driver Magazine, Cover Story
How Sinkholes Form
(courtesy of St. Johns River Water Management District)
sinkhole prior to remediation
Vew Prior to Remediation
(Click on picture to enlarge)
lip of sinkhole
View from Lip of Sinkhole

Sinkhole Facts

  • Within 2 hours the sinkhole grew to a surface diameter of 150 feet and a depth of 60 feet.

  • The stability of two 3-story apartment buildings was threatened; the apartments were evacuated.

  • Due to heavy rainfall, an impenetrable liner was installed to prevent saturation and erosion of soils between the buildings and sinkhole.

  • As a temporary measure, a chemical grout was injected to solidify the sands beneath the building foundations.

  • The ultimate solution was to install a 200-foot long Giken Wall between the buildings and the sinkhole. Comprised of interlocked 36-inch diameter steel tubular piles that extended to a depth of 50 feet.

  • The Giken wall was installed with the Press-In method that is virtually silent and creates little ground vibration, which was critical for protecting the structures.

sinkhole
Closer view of sinkhole.
Cone penetrometer test sounding equipment
Cone penetrometer test sounding equipment
GEC Geologist
GEC Geologist with
ground penetrating radar equipment
Sinkhole being covered by PVC liner
Sinkhole being covered by PVC liner
PVC liner further covering sinkhole
PVC liner further covering sinkhole
Standard Penetration Test
Standard Penetration Test
drilling near sinkhole edge
Exposed sewer lines within sinkhole
Exposed sewer lines within sinkhole
Sinkhole Formation Mechanism
Sinkhole Formation Mechanism
Steel tubular piles lifted into place over building
Steel tubular piles lifted into place over building
Giken silent piler wall installation
Giken silent piler wall installation

All images, unless otherwise specified, © Geotechnical and Environmental Consultants.

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