Geomechanics and Engineering

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Assessment of pull-out behavior of tunnel-type anchorages under various joint conditions

  • Junyoung Ko (Department of Civil Engineering, Chungnam National University) ;
  • Hyunsung Lim (Department of Wind Power Business, Hanwha Corporation/E&C) ;
  • Seunghwan Seo (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Moonkyung Chung (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • Received : 2023.05.15
  • Accepted : 2023.12.04
  • Published : 2024.01.10
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Abstract

This study analyzes the pull-out behavior of tunnel-type anchorage under various joint conditions, including joint direction, spacing, and position, using a finite element analysis. The validity of the numerical model was evaluated by comparing the results with a small-scaled model test, and the results of the numerical analysis and the small-scaled model test agree very well. The parametric study evaluated the quantitative effects of each influencing factor, such as joint direction, spacing, and position, on the behavior of tunnel-type anchorage using pull-out resistance-displacement curves. The study found that joint direction had a significant effect on the behavior of tunnel-type anchorage, and the pull-out resistance decreased as the displacement level increased from 0.002L to 0.006L (L: anchorage length). It was confirmed that the reduction in pull-out resistance increased as the number of joints in contact with the anchorage body increased and the spacing between the joints decreased. The pull-out behavior of tunnel-type anchorage was thus shown to be significantly influenced by the position and spacing of the rock joints. In addition, it is found that the number of joints through which the anchorage passes, the wider the area where the plastic point occurs, which leads to a decrease in the resistance of the anchorage.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2022R1C1C1011477). Also, this research was supported by a grant (21SCIP-B119947-06) from the Construction Technology Research Program funded by the Ministry of Land, Infrastructure and Transport of Korean government.

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