Geomechanics and Engineering

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Ultrasonically enhancing flowability of cement grout for reinforcing rock joint in deep underground

  • Junho Moon (Department of Civil and Environmental Engineering, Myongji University) ;
  • Inkook Yoon (Department of Civil and Environmental Engineering, Myongji University) ;
  • Minjin Kim (Department of Civil and Environmental Engineering, Myongji University) ;
  • Junsu Lee (Department of Civil and Environmental Engineering, Myongji University) ;
  • Younguk Kim (Department of Civil and Environmental Engineering, Myongji University)
  • Received : 2022.10.13
  • Accepted : 2023.04.10
  • Published : 2023.04.25
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Abstract

This study analyzes the changes in the physical properties of grout by irradiating it with ultrasonic energy and assesses the injectability of the grout into deep rock fractures. The materials used in the research are OPC (Ordinary Portland Cement) and MC (Micro Cement), and are irradiated depending on the water/cement ratio. After irradiating the grout with ultrasonic energy, viscosity, compressive strength, and particle size are analyzed, and the results of the particle size analysis were applied to Nick Barton's theory to evaluate the injectability of the grout into deep rock fractures under those conditions. It was found that the viscosity of the grout decreased after ultrasonic wave irradiation, and the rate of viscosity reduction tended to decrease as the water/cement ratio increased. Additionally, an increase in compressive strength and a decrease in particle size were observed, indicating that the grout irradiated with ultrasonic energy was more effective for injection into rock fractures.

Keywords

Acknowledgement

This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (grant number 22UUTI-C157813-03) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (grant number 2021R1I1A1A01049067).

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