Sinkholes that propagate during construction present a severe safety hazard for on-site personnel and can result in additional, unanticipated project costs. This paper discusses cover-subsidence and cover-collapse sinkholes that occurred on a site in western Citrus County, Florida, between initial geotechnical exploration and completion of drilled shaft construction. The sinkholes occurred in several locations across the project site, which resulted in the deterioration of the working platform and posed an imminent threat to worker safety. This paper also discusses several factors that may have contributed to the propagation of sinkholes. This study includes site investigation, field observation, meteorological, and groundwater data gathered throughout the duration of the project. During this time, more than 110 sinkholes were repaired using more than 1,000 cubic yards of backfill material.
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