Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Experimental study on pullout capacity on friction type steel pipe rock bolt to use elastic restoring force and existing rock bolts

탄성복원력을 이용한 마찰형 강관 록볼트 및 기존 록볼트에 대한 인발력 실험연구

  • Moorak Son (Dept. of Civil Engineering, Daegu University) ;
  • Jihyun Kim (Dept. of Civil Engineering, Daegu University)
  • 손무락 (대구대학교 건설시스템공학과) ;
  • 김지현 (대구대학교 건설시스템공학과)
  • Received : 2023.10.12
  • Accepted : 2023.11.14
  • Published : 2023.11.30
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Abstract

In this study, an experiment on pullout capacity was conducted of rock bolts using grouting materials such as cement mortar and resin, which are widely used, and a newly proposed steel pipe friction type rock bolt using elastic restoring force, and the results were compared and analyzed. The experimental results showed that the pullout capacity on the rock bolts with cement mortar under a dry condition (no ground water) was relatively larger than the rock bolts with resin and the steel pipe. Nevertheless, the friction type steel pipe rock bolt to use elastic restoring force is expected to be useful in the field particularly where groundwater exists and it affects the loss and curing of grouting materials such as cement mortar or resin. In addition, it was found to have the advantage of being easy and quick to install.

본연구에서는 국내에서 많이 활용되고 있는 시멘트 모르타르 및 수지와 같은 그라우팅재를 이용한 정착형 록볼트와 새롭게 제시되는 탄성복원력을 이용한 강관 마찰형 록볼트에 대한 인발력실험을 수행하고 그 결과를 비교분석 하였다. 지하수가 없는 건조한 조건에서 실험한 결과, 기존 시멘트 모르타르를 이용한 록볼트에 대한 인발력이 레진을 이용한 록볼트와 마찰형 강관 록볼트와 비교하여 측정한 인발력이 상대적으로 크게 나타났다. 그럼에도 불구하고 탄성복원력을 이용한 마찰형 강관 록볼트는 특히 지하수가 존재하여 그라우팅재료의 손실과 양생에 영향을 미치는 현장조건에서 유용하게 사용할 수 있을 것으로 판단된다. 이와 더불어 마찰형 강관 록볼트는 설치가 간편하고 빠른 장점을 가질 수 있는 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원(No. NRF-2021R1F1A1063856)을 받아 수행되었으며, 이에 감사드립니다.

References

  1. EBN Industrial Economy (2022), Kolon Global's 'Tube-type steel rock bolt' acquired green technology certification, https://m.ebn.co.kr/news/view/1538079 (September 27, 2023).
  2. Indraratna, B., 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, No. 4, pp. 269-281. https://doi.org/10.1016/0148-9062(90)90529-B
  3. Kim, K.C., Kim, H.J., Jung, Y.H,, Shin, J.H. (2017), "Anchorage mechanism of inflatable steel pipe rockbolt depending on rock stiffness", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 2, pp. 249-263. https://doi.org/10.9711/KTAJ.2017.19.2.249
  4. Lee, I.M., Kim, K.H., Shin, J.H., Nam, S.W. (2005), "Behavior of grouted bolts in consideration of seepage forces", Journal of Korean Tunnelling and Underground Space Association, Vol. 7, No. 3, pp. 209-218.
  5. Oreste, P.P., Peila, D. (1996), "Radial passive rockbolting in tunnelling design with a new convergence-confinement model", International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 33, No. 5, pp. 443-454. https://doi.org/10.1016/0148-9062(96)00009-5
  6. Shin, H.K., Jung, H.S., Ahn, D.W. (2017), "A study on the development and field application of SPRockbolt with high-strength steel pipe", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 4, pp. 651-668. https://doi.org/10.9711/KTAJ.2017.19.4.651
  7. Son, S.G., You, J.O., Kim, J.H., Lee, I.G., Son, Y.H. (2014), "A plan to guarantee quality of rockbolt for the improvement of tunneling", Proceedings of the 2014 Autumn Conference & Annual Meeting of the Korean Society for Railway, Jeju, pp. 610-614.
  8. Stille, H., Holmberg, M., Nord, G. (1989), "Support of weak rock with grouted bolts and shotcrete", International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 26, No. 1, pp. 99-113.  https://doi.org/10.1016/0148-9062(89)90530-5