Florida's coastal plain—Miami-Dade and Broward counties—sits atop porous limestone capped by thin sequences of sand, marl, and organic soils. Ground subsidence driven by compressible soil consolidation, organic soil oxidation, and groundwater management changes causes progressive damage to highways, commercial buildings, utility infrastructure, and stormwater systems across the region's most densely developed corridors.
As sea level rises, Florida's already-thin freeboard margin shrinks further—making every inch of subsidence doubly consequential. Roads built to specific drainage grades lose their design slope. Stormwater systems that relied on gravity flow toward the coast lose gradient. Building foundations settle unevenly as compressible marl and organic soil layers consolidate under structural loading. FDOT manages subsidence-affected highway segments across the region where traditional repaving cannot keep pace with ongoing settlement.
Compaction grouting densifies the compressible marl and organic soil layers causing settlement—arresting further subsidence and providing a platform for grade restoration. GSI designs injection programs targeting the specific soil layers identified through CPT soundings and borings as the primary drivers of settlement at each site.
Where settlement has displaced structures beyond tolerance, underpinning transfers loads to the Miami Limestone or competent sand layers below the compressible zone. GSI installs micropiles or helical piers and relevels the structure to design grade—addressing both the foundation support and the visible damage.
Florida's high water table and tidally influenced groundwater complicate every subsurface treatment program. GSI designs grouting programs that account for groundwater conditions—specifying grout rheology, injection rates, and treatment sequences that perform in saturated, tidally fluctuating ground conditions.
Subsidence treatment that works in dry, stable ground conditions can fail in Florida's tidally influenced, high-water-table environment. GSI engineers for these conditions:
Every inch of subsidence in Florida reduces the freeboard margin protecting your infrastructure from flooding. GSI's coastal plain specialists design treatment for the ground conditions and groundwater realities Florida presents.
