Abstract
Seismic refraction tomography field data were collected on several bridge foundation sites in Pennsylvania, in close proximity to geotechnical boring locations. Profiles determined from these field measurements were plotted against drilling data, and these comparisons revealed the ability of seismic wave velocities to differentiate overburden soil from rock. In addition, foundation construction data were collected at each of the sites and compared with refraction test results determined prior to construction. In particular, top of rock revealed by an excavation, and pile tip elevations at driving refusal, were compared with refraction test results. From these data it appears that seismic wave tomograms can characterize the soil/rock interface, and that it is possible to predict expected design pile lengths based upon a measured P-wave velocity tomogram. It can be concluded from these site comparisons that geophysical techniques such as seismic refraction tomography can provide important additional information to site characterization for bridge foundations in karst terrane. However, these techniques should not be viewed as a replacement, but should be conducted during design stage site investigation to aid selection of borehole locations and other testing needs.
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