Florida sits atop the Florida Platform, a carbonate formation of limestone that slightly acidic groundwater has been dissolving for millions of years, leaving cavities and voids beneath much of the state. In west-central Florida, where dense, cohesive soils overlie this porous limestone, those voids can develop unevenly beneath a single foundation footprint and, in some cases, collapse suddenly with little surface warning — the pattern known as cover-collapse sinkholes. Hernando, Pasco, and Hillsborough counties, often called Florida's Sinkhole Alley, alone accounted for roughly two-thirds of the state's sinkhole insurance claims in the years FDEP has tracked them closely. FDOT and Florida commercial property owners manage the same underlying risk: differential settlement tied to confirmed or suspected limestone dissolution.
It's a recurring example of the Foundation Settlement Issues conditions FDOT and local owners manage statewide.
Micropiles are small-diameter, high-capacity piles — typically 5 to 12 inches across — that are drilled and grouted in place, bearing past confirmed dissolution zones into competent limestone or sand strata and bypassing ground that geophysical investigation has flagged as void-prone. Because installation produces minimal vibration and noise, this approach is well suited to underpinning occupied structures without extensive excavation. This is one application of GSI's broader foundation bearing micropiles expertise.
Helical piers give Florida foundations verified, load-tested bearing capacity in karst terrain where conventional footings risk future settlement as dissolution continues beneath untreated ground. GSI's foundation footings for sinking structures experience informs this approach.
Once underpinning confirms stable, long-term bearing capacity, hydraulic jacks relevel structures displaced by karst-related differential settlement back toward their original design grade. This draws directly on GSI's ground improvement solutions work.
GSI's engineers' experience also shapes how these Florida projects are scoped from the start, with prompt site assessments and fast proposal turnaround so project teams can move from evaluation to design without delay.
Engineered for Florida's conditions. GSI's Florida underpinning verifies bearing capacity against confirmed karst dissolution zones, addressing a foundation risk unique to the state's limestone geology. Supported by commercial properties and asset owners capability statewide.
Design/build delivery. One team carries the project from design to install, removing the handoff delays between design and field work.
FDOT specification compliance. Documentation and field practices satisfy state DOT specifications from first submittal.
Rapid response when conditions demand it. Beyond planned underpinning work, GSI's emergency response team is available around the clock for sudden sinkhole activity or structural distress affecting roadways, bridges, and commercial facilities.
GSI's engineers deliver a warrantied, design/build foundation solution built to verify bearing capacity against Florida's karst dissolution risk.
