Imaging karstic structures with GPR along a motorway under construction

Sophie Geraads; Gildas Omnes

doi:10.1117/12.462224

12 April 2002 Imaging karstic structures with GPR along a motorway under construction

Sophie Geraads, Gildas Omnes

Proceedings Volume 4758, Ninth International Conference on Ground Penetrating Radar; (2002) https://doi.org/10.1117/12.462224
Event: Ninth International Conference on Ground Penetrating Radar (GPR2002), 2002, Santa Barbara, CA, United States

Abstract

The construction of motorways generally involves the removal of the loose clayey surficial deposits thus creating adequate conditions for the illumination of structures several meters deeep within resistive bedrocks. The present paper describes the acquisition, processing interpretation and drilling results associated with the construction of a motorway intersecting karstic limestones in southwestern France. The processing sequence was similar to to sequences routinely applied to reflection seismic data from gain recovery to migration. In addition a Georadar Index section was derived from the envelope of the analytic signal after migration. Drilling on a vertical anomaly about 1.5 m high at a depth of 1,5 m confirmed the presence of a void between 1.5 m and 3.0 m. Many other structural details such as joints enlarged by karstification, layering, faults, can be seen on the sections.

Citation Download Citation

Sophie Geraads and Gildas Omnes "Imaging karstic structures with GPR along a motorway under construction", Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); https://doi.org/10.1117/12.462224

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