Geomechanics and Engineering

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Experimental approach to evaluate weathering condition of granite using electrical resistivity

  • Oh, Tae-Min (Geologic Environment Division, Underground Space Department, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Cho, Gye-Chun (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Son, Thai An (Architectural Planning Manager, Department of Planning, GS E&C) ;
  • Ryu, Hee-Hwan (Power Transmission Laboratory, Korea Electric Power Research Institute) ;
  • Lee, Changho (Department of Marine and Civil Engineering, Chonnam National University)
  • Received : 2014.02.12
  • Accepted : 2015.01.26
  • Published : 2015.05.25
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Abstract

Weathering is the breaking/cutting down process of rocks due to physical and chemical processes in natural as well as artificial environment including $CO_2$ injection for storage in the sediment, or natural resource recovery process. This study suggests an alternative method to estimate the degree of weathering for granites. A series of laboratory and field experiments are performed to measure electrical resistivities on various rock samples experienced different degrees of weathering and their residual soils under different saturation conditions. It is found that the normalized electrical resistivity increases with a decrease in water absorption and the saturation. Simple boundaries are suggested to identify the weathering degree of granites, based on limited data. Field test results for three sites confirm that the suggested method could be estimated well the degree of weathering of granites compared with the other methods suggested previously. Although further research is required, this study suggests that an electrical resistivity could be an effective approach to estimate the degree of weathering of granites compared with the other methods suggested previously.

Keywords

References

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