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Hybrid seismic surveying is instrumental for a preliminary geotechnical assesssment of the subsoil with infrastructural projects.
Key benefits
- Be aware of all hazards related to geologically unstable areas
- No costly bore holes required or slash the number of boreholes by drilling at meaningful locations only
- Detection of faults and decompaction zones
- Assessment of mechanical rock properties
- Recognition of karstified zones
- Delineation of the bedrock surface
- Area-wide investigation
- Environmentally friendly – no or negligible field and crop damage
- Applicable also in urban areas
- Fast field data acquisition, daily progress 1 – 2 km
- Readily available evaluation results within 2 – 3 days
Examples
- Example 1: Road bypass tunnel project
- Example 2: Early structural investigation of the subsurface for the extension of a motorway by one lane
- Example 3: Geotechnical dam site investigation in Turkey using p- and s-wave seismic data surveying
Example 1: Road bypass tunnel project
Area wide hybrid seismic survey using five profiles for optimal positioning of the tunnel:
Interpreted hybrid seismic section (line 13KITZ-5 in red) clearly maps the bedrock surface and was used for the positioning of various boreholes:
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Example 2: Early structural investigation of the subsurface for the extension of a motorway by one lane
Detailed survey in the region east of Basel (Switzerland) known for its wide spread karst leaching features:
P-wave velocity field derived by analytic refraction tomography inversion allowed the detection of ongoing karst leaching in a 90 m long and up to 35 m high dissolution zone with the potential of a developing, and eventually capsizing cavity:
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Example 3: Geotechnical dam site investigation in Turkey using p- and s-wave seismic data surveying
Situation map of the seismic profiles:
High resolution hybrid seismic survey using p- & s-wave refraction tomography with a non-intrusive derivation of spatially continuous dynamic elasticity moduli (Young’s modulus E, shear modulus G & Poisson’s ratio):
