Florida's karst limestone terrain, the Florida Platform, a carbonate formation groundwater has been slowly dissolving for millions of years, produces dissolution voids and loosely consolidated ground that collapse conventional drilled pier boreholes before concrete can be placed. In west-central Florida, where dense, cohesive soils overlie this porous limestone, that risk is compounded by cover-collapse sinkholes that can open with little surface warning. Foundation contractors across the state's central karst belt, including the Sinkhole Alley counties of Hernando, Pasco, and Hillsborough, have learned through repeated failed attempts that standard pier installation cannot reliably cross this ground condition.
GSI treats this as one of several Subsurface Void & Sinkhole Problems issues the state's infrastructure owners regularly face.
As a cased micropile is drilled, a high-strength steel casing advances just behind the drill bit, keeping the borehole open through karst voids and loosely consolidated dissolution-affected soil that would collapse an open hole before concrete placement. This draws directly on GSI's cased micropiles work.
Florida cased micropiles bear in competent limestone or sand strata below confirmed dissolution zones, verified through test borings at each location rather than assumed at a standard depth, since void depth varies even across a single site. GSI's foundation bearing micropiles capability supports this step.
The steel casing, combined with grout and internal reinforcement, gives Florida cased micropiles higher compression, tension, and shear capacity than standard micropiles, and depending on soil stiffness and casing specifications they can extend to depths of up to 250 feet, accommodating both standard structural loading and the additional design margin karst-affected sites often warrant.
GSI often considers its water infrastructure experience alongside this work when scoping Florida projects, since utilities and treatment facilities across the state face the same karst-affected ground. Prompt site assessments and fast proposal turnaround help project teams move from evaluation to design without delay.
Engineered for Florida's conditions. GSI's Florida cased micropiles solve the exact borehole collapse problem that has defeated conventional pier installation across the state's karst belt. GSI's commercial properties and water infrastructure experience backs this approach.
Design/build delivery. One contract covers design and construction, eliminating coordination gaps between engineering and construction.
FDOT specification compliance. Design and construction records satisfy applicable DOT specifications from the first review cycle.
Rapid response when conditions demand it. Beyond planned installation work, GSI's emergency response team is available around the clock for sudden sinkhole activity affecting roadways and commercial sites.
GSI's engineers deliver a warrantied, design/build cased micropile solution built to bore safely through Florida's karst dissolution zones.
