Geophysical techniques have been used for many years in subsurface explorations and subsurface utility engineering (SUE) work; however, the two fields have historically been regarded as separate disciplines. Recent developments in geophysical technologies, in particular Multi-Channel Analysis of Surface Waves (MASW) and ground penetrating radar (GPR), have led to the marriage of SUE and subsurface exploration for the assessment of existing infrastructure; including detailed utility location, sewer condition studies, and evaluation of aging/distressed structures. Practical applications have shown that geophysical techniques are fast, efficient, and cost effective tools that can aid in the assessment of a wide variety of infrastructure related problems. A single case study will be presented that illustrates the use of the MASW method to detect areas where existing interceptor sewers (tunnels) are in danger of potential collapse, in direct correlation with information obtained by performing test borings and closed-circuit television inspections.
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