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Geomechanics and Engineering
  Volume 8, Number 5, May 2015, pages 675-685

Experimental approach to evaluate weathering condition of granite using electrical resistivity
Tae-Min Oh, Gye-Chun Cho, Thai An Son, Hee-Hwan Ryu and Changho Lee

    Weathering is the breaking/cutting down process of rocks due to physical and chemical processes in natural as well as artificial environment including CO2 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.
Key Words
    degree of weathering; electrical resistivity; Korean granite; weathering classification
(1) Tae-Min Oh:
Geologic Environment Division, Underground Space Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Korea;
(2) Gye-Chun Cho:
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea;
(3) Thai An Son:
Architectural Planning Manager, Department of Planning, GS E&C, Hanoi, Vietnam;
(4) Hee-Hwan Ryu:
Power Transmission Laboratory, Korea Electric Power Research Institute, Daejeon, Korea;
(5) Changho Lee:
Department of Marine and Civil Engineering, Chonnam National University, Yeosu, 550-749, Korea.

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