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Geotechnichal Engineering:
Geophysical exploration techniques have numerous applications in geotechnical engineering. They can be used to determine the depth to and rippability of bedrock, assess seismic hazards, measure earth conductivity, gauge the depth to permafrost, etc. They can also be used to augment drilling programs by providing continuous subsurface information between boreholes and direct drilling programs by identifying anomalous areas for further drilling and/or sampling.
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Engineering Geophysical Services:
Depth to Bedrock/Rippability
Seismic Hazard Assesment
Marine Sub-Bottom Profiling
Permafrost Mapping
Grounding and Cathodic Protection Measurement
Geologic Mapping
Vibration/Blast Monitoring
Rebar/Post-tensioning Location
Utility Mapping/Utility Locating
Void Detection
Depth to Bedrock/Rippability:
Accurate knowledge of depth
to and rippability of bedrock can be very important when planning excavations
and highway or pipeline cuts. Seismic refraction data can provide nearly
continuous depth to bedrock profiles in a cost effective manner. In addition,
seismic refraction surveys provide the necessary seismic velocity information
to estimate the rippability of bedrock.
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Seismic Hazard Assessment:
Downhole seismic surveys and surface wave analysis can be useful in assessing seismic risks. Downhole seismic surveys provide data necessary to create models of the ground's response to earthquakes. This enables engineers to estimate ground motion amplification and liquefaction potential, important considerations in the design of structures in earthquake-prone areas. Downhole Seismic or Passive source Micro-tremor Array Measurements (MAM) are a means of deriving shear wave velocities that allow engineers to classify a site based on the 2000 International Building Code (IBC).
Void Detection :
Voids, abandoned mines, cavities and other subsidence features can be mapped using geophysical methods including microgravity, ground penetrating radar, electrical resistivity imaging and surface wave measurements.
