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Probabilistic Rock Mass Rating Estimation Using Electrical Resistivity

  • Tunnel Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Understanding exact rock conditions has a significant impact on the success of tunnel construction. Various methods such as Q-systems and rock mass rating (RMR) have been used to estimate the condition of jointed rock mass in fields. However, the evaluation of rock mass characteristics can diverge because of the subjective views of observers. Many researchers that work on the relationship between rock mass classification methods and its physical variables have tried to solve this problem; nevertheless, the accuracy of their studies has become a subject of controversy. Thus, in this study, we tried to evaluate rock mass classification in terms of RMR from the electrical resistivity that is readily affected by the characteristics of jointed rock mass. The relationship between the RMR parameters and the electrical resistivity was deducted using the formula of electrical resistivity analyzed for jointed rock mass. The correlation analyses were performed based on real data (4,689 sets) in order to obtain the degree of correlation among RMR parameters. The results show that some parameters are strongly correlated while other parameters are not. Stochastic analyses show that the theoretical relationship between RMR value and electrical resistivity can be improved by probabilistically removing the irrelevant (low possibility) relation among RMR parameters. Finally, a field test was performed to verify the suggested probabilistic RMR estimation using electrical resistivity.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2017R1A5A1014883) and Korea Electric Power Corporation (Grant number: R18XA06-09).

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Authors and Affiliations

  1. Member, Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea

    Chang-Ho Hong & Gye-Chun Cho

  2. Structural & Seismic Technology Group, Power Transmission Laboratory, Korea Electric Power Research Institute, Daejeon, 34056, Korea

    Hee-Hwan Ryu

  3. Member, Dept. of Civil Engineering, Pusan National University, Busan, 46241, Korea

    Tae-Min Oh

Authors
  1. Chang-Ho Hong
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  2. Hee-Hwan Ryu
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  3. Tae-Min Oh
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  4. Gye-Chun Cho
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Correspondence to Gye-Chun Cho.

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Hong, CH., Ryu, HH., Oh, TM. et al. Probabilistic Rock Mass Rating Estimation Using Electrical Resistivity. KSCE J Civ Eng 24, 2224–2231 (2020). https://doi.org/10.1007/s12205-020-1315-4

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  • DOI: https://doi.org/10.1007/s12205-020-1315-4

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