Publication Date
5-2020
Abstract
Over a period of several years, multiple investigation methods were used to assess conditions within the area of a stormwater infiltration basin. The initial investigation was a conventional geotechnical study using auger borings. This was supplemented with conductivity based electrical methods of geophysics. No adverse risk was identified in the initial investigation, however sometime later sinkholes formed and additional investigations were undertaken. The new investigation added seismic and spontaneous potential geophysics, as well as, rock cores with borehole televiewer. Subsequently, the area was excavated to expose the top of rock surface. Comparison of both the initial and additional investigations to the exposed conditions show limitations of the methods used. This paper presents a comparison of the results by the different methods and the actual conditions exposed in excavations as well as the effectiveness of each method in representation of subsurface features.
DOI
https://doi.org/10.5038/9781733375313.1025
Comparison of investigation methods at a karst site
Over a period of several years, multiple investigation methods were used to assess conditions within the area of a stormwater infiltration basin. The initial investigation was a conventional geotechnical study using auger borings. This was supplemented with conductivity based electrical methods of geophysics. No adverse risk was identified in the initial investigation, however sometime later sinkholes formed and additional investigations were undertaken. The new investigation added seismic and spontaneous potential geophysics, as well as, rock cores with borehole televiewer. Subsequently, the area was excavated to expose the top of rock surface. Comparison of both the initial and additional investigations to the exposed conditions show limitations of the methods used. This paper presents a comparison of the results by the different methods and the actual conditions exposed in excavations as well as the effectiveness of each method in representation of subsurface features.
