Sinkhole Collapse Mapping - Soil & Bedrock Void Detection
and Subsidence Characterization
SINKHOLE REPAIRS: Sinkhole excavation.
SINKHOLE REPAIRS: Graded fill and filter fabric.
SUPERSTING SURVEY: Profile mapping across central
KY horse farm.
Bluestone Geologic uses the latest geophysical techniques to locate sites with unstable underground conditions in the limestone bedrock or soil where voids form at shallow depths causing surface subsidence. Many horse farms in central Kentucky and new build sites around Bowling Green & southern Kentucky experience collapse where very soluble limestone buried near to the surface undergoes weathering that compromises its support structure. These conditions are found even more often in areas where the structural integrity of the bedrock has been compromised - along faults, fractures, and linear sinkhole and karst conduit trends where dissolution of the limestone is concentrated. Building collapse, subsiding parking lots and loss or injury of livestock has been documented throughout these regions. Our electrical or radar (GPR) mapping systems can screen >10 acres per day, and prove to be an effective way to locate sites with the potential for future collapse; especially important in areas designated for new construction, e.g. buildings, parking lots, etc.
Electric Resistivity (ER) profiling & GPR mapping quickly locates very specific areas with the greatest risk for failure, resulting in a cost effective way to identify potential problem sites. These very accurate subsurface maps can pinpoint sites needing additional subsurface investigation, monitoring, or remedial repairs prior to construction.
Soil ER measurements by 4-Point Wenner and SuperSting profiling run across commercial and large-scale construction sites are integral pre-build surveys that generate data identifying sites where follow-up geotechnical mapping is required. Soil boring and bedrock coring can then be advanced to better detail subsurface conditions beneath properties planned for new building construction. The ER & GPR data is collected quickly, typically in 1-3 days in-field survey time, and generates real-time mapping results that can be used to clear a prospect site for next phase construction, or to pinpoint areas needing additional inspection or drainage repairs.