Abstract

This case presents combined geotechnical and geophysical investigations with electrical resistivity tomography (ERT) used ahead of a horizontal directional drilling (HDD) planned for crossings of a stream. Former results were inconclusive concerning the depth to shallow limestone, so detection of a fault zone and HDD installation work were delayed. A seismic refraction line and additional ERT profiles were acquired, and advanced inversion techniques combining the geophysical and geotechnical data were applied. Despite the lack of resolution in the seismic refraction data, the ERT results were able to image the top of the limestone, and an area affected by faulting was established so that the pipeline installation could continue. The case includes practical survey and planning considerations along with examples of interpretations and results.

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