Several techniques may be utilized to remediate sinkhole conditions which are adversely affecting a structure. Compaction Grouting, Underpinning, and Shallow Surface Grout Injection are several examples of remediation techniques commonly utilized to mitigate structural and/or architectural distress attributed to sinkhole conditions. Geohazards, Inc. provides structural assessments, structural and geotechnical remediation plans, in addition to structural and geotechnical remediation monitoring and certifications which address sinkhole conditions and sinkhole remediation.
Compaction Grouting is performed by injecting grout under pressure through a steel casing into the ground immediately around and below the affected structure. Grout injected below the ground surface fills voids, cavities, and soft zones within limestone. The process of grout injection also serves to stabilize the sediment above the underlying limestone surface by compression and compaction.
Underpinning is a technique utilized to repair structures that exhibit major distress. The process of underpinning forces thick walled steel pipes, commonly referred to as Pin Piles, vertically into the ground surface using the weight of the structure as the reaction mass. The Pin Piles are hydraulically advanced until downward force results in structural lift. The Pin Piles are then welded to a bracket that is attached to the foundation of the structure. Underpinning transfers the weight of the structure from unstable surficial soils to stable sub-surface materials.