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2025 Vol.26, Issue 5
Development and Performance Evaluation of Elastic Cylindrical Rock Bolts for Tunnel and Slope Stabilisation

터널 및 사면 안정화를 위한 탄성 실린더형 록볼트 개발 및 성능 평가

Moorak Son1*
,
Beomchang Ji2
,
Sangmin Lee3
손 무락1*
,
지 범창2
,
이 상민3
1Professor, Department of Civil Engineering, Daegu University
2Undergraduate Student, Department of Civil Engineering, Daegu University
3Undergraduate Student, Department of Civil Engineering, Daegu University
*Corresponding Author
1 May 2025. pp. 5-11
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Abstract

The development of underground spaces such as tunnels, subways, roads, and railways is increasing, making technologies that ensure the stability of rock structures increasingly important. However, traditional rock bolts have limitations, including inconsistent adhesion, long installation times, and environmental concerns, which restrict their ability to guarantee stability. To address these issues, this study developed a new elastic cylinder rock bolt with longitudinal incisions. This bolt is designed to immediately adhere to the drilled hole walls upon insertion, providing high support strength without the need for a curing period and minimizing environmental impact. The study presents field experiments conducted to evaluate the performance of the elastic cylinder rock bolt and discusses the results.

Keywords
Tunnel
Slope
Stability
Elastic cylinder rock bolt
Performance evaluation

터널, 지하철, 도로, 철도 등 다양한 지하공간 개발이 증가하면서 암반 구조물의 안정성을 확보할 기술이 점점 더 중요해지고 있다. 그러나 기존 록볼트는 접착력의 불균일, 긴 설치 시간, 환경 오염 우려 등 여러 한계를 지니고 있어 안정성 보장에 한계가 있다. 이를 개선하기 위해 본 연구에서는 길이방향으로 절개된 탄성 실린더형 록볼트를 새롭게 개발하였다. 이 록볼트는 천공홀에 삽입되자마자 벽면에 밀착해 즉각적으로 높은 지지력을 발휘하도록 설계되었으며, 경화 시간이 필요 없고 환경적 영향을 줄일 수 있다. 본 연구는 현장 실험을 통해 탄성 실린더형 록볼트의 성능을 평가하고 그 결과를 제시하였다.

키워드
터널
사면
안정성
탄성 실린더형 록볼트
성능 평가
References
1

EXCS: Expressway Construction Specification (2021), EXCS 11 70 11 Rock Bolt (Auxilliary Facilities Section), Korea Expressway Corporation.

2

Indraratna, B. and Kaiser, P.K. (1990), "Design for grouted rock bolts based on the convergence control method", International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 27(4), pp. 269~280.

10.1016/0148-9062(90)90529-B
3

Kim, K.-C., Kim, H.-J., Jung, Y.-H. and Shin, J.-H. (2017), "Anchorage mechanism of inflatable steel pipe rock bolt depending on rock stiffness", J. of Korean Tunnelling and Underground Space Association, Vol. 19(2), pp. 249~263.

10.9711/KTAJ.2017.19.2.249
4

Lee, I.-M., Kim, K.-H., Shin, J.-H. and Nam, S.-W. (2005), "Behavior of grouted bolts in consideration of seepage forces", J. of Korean Tunnelling and Underground Space Association, Vol. 7(3), pp. 209~218.

5

Oreste, P.P. and Peila, D. (1996), "Radial passive rock bolting in tunneling design with a new convergence-confinement model", International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 33(5), pp. 443~454.

10.1016/0148-9062(96)00009-5
6

Shin, H.-K., Jung, H.-S. and Ahn, D.-W. (2017), "A study on the development and field application of SP-Rockbolt with high-strength steel pipe", J. of Korean Tunnelling and Underground Space Association, Vol. 19(4), pp. 651~668.

7

Son, M. and Kim, J. (2023), "Experimental study on pullout capacity on friction type steel pipe rock bolt to use elastic restoring force and existing rock bolts", J. of Korean Tunnelling and Underground Space Association, Vol. 25(6), pp. 459~468.

8

Son, S.-G., You, J.-H., Kim, J.-H., Lee, I.-G. and Son, Y-H. (2014), "A plan to guarantee quality of rock bolt for the improvement of tunneling", Proceedings of the Korean Society for Railway, Fall, pp. 610~614.

Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 26
  • No :5
  • Pages :5-11
  • Received Date : 2024-11-14
  • Revised Date : 2024-11-26
  • Accepted Date : 2025-04-18
  • DOI :https://doi.org/10.14481/jkges.2025.26.5.5
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