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Evaluation of grout penetration in single rock fracture using electrical resistivity

  • Lee, Hangbok (Center for Deep Subsurface Research, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Oh, Tae-Min (Department of Civil and Environmental Engineering, Pusan National University (PNU)) ;
  • Lee, Jong-Won (Department of Civil and Environmental Engineering, Pusan National University (PNU))
  • Received : 2020.01.16
  • Accepted : 2020.11.07
  • Published : 2021.01.10

Abstract

In this study, a new approach using electrical resistivity measurement was proposed to detect grout penetration and to evaluate the grouting performance for such as waterproof efficiency in single rock fracture. For this purpose, an electrical resistivity monitoring system was designed to collect multi-channel data in real time. This was applied to a system for grout injection/penetration using a transparent fracture replica with various aperture sizes and water-cement mix ratio. The electrical resistivity was measured under various grout penetration conditions in real time, which results were directly compared to the visual observation images of grout penetration/distribution. Moreover, the grouting success status after the curing process was evaluated by measuring the electrical resistivity in relation to changes in frequency in fracture cells where grout injection and penetration were completed. Consequently, it was determined that the electrical resistivity monitoring system could be applied effectively to the detection of successful penetration of grouting into a target area and to actual field evaluation of the grouting performance and long-term stability of underground rock structures.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. NRF-2019R1G1A1100517) and the Basic Research and Development Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM), which was funded by the Ministry of Science, ICT, Republic of Korea.

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