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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
권호 표지
DOI QR코드

DOI QR Code

DEM numerical study for the effect of scraper direction on shield TBM excavation in soil

개별요소법을 이용한 스크래퍼 비트방향이 토사지반에서의 쉴드 TBM 굴진에 끼치는 영향 연구

  • Lee, Gi-Jun (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kim, Huntae (R&D Center (TBM Technical Team), Head Office, Energy & Machinery Korea) ;
  • Kwon, Tae-Hyuk (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Cho, Gye-Chun (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kang, Shin-Hyun (R&D Center, Head Office, Energy & Machinery Korea)
  • 이기준 (한국과학기술원(KAIST) 건설및환경공학과) ;
  • 김훈태 (이엠코리아 본사 연구소(TBM기술팀)) ;
  • 권태혁 (한국과학기술원(KAIST) 건설및환경공학과) ;
  • 조계춘 (한국과학기술원(KAIST) 건설및환경공학과) ;
  • 강신현 (이엠코리아 본사 연구소(TBM기술팀))
  • Received : 2019.07.11
  • Accepted : 2019.08.02
  • Published : 2019.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

In tunnel excavation by TBMs, a cutterhead, which practically excavates the ground, is an important part directly affecting net penetration rate. Most of the researches on the cutterhead design that have been carried out until now are on the cutter arrangement. It is difficult to find a study for the effect of the scraper installation direction on TBM excavation although same cutterheads except for direction of the scraper are used in Korea. Therefore, this paper shows how the direction of scraper installation affects shield-TBM excavation. Discrete element method was used to identify the effect of scraper installation direction on shield-TBM excavation. When the scraper installation direction was outward, the amount of particles per unit time flowed into the cutter head opening was smaller than when the scraper installation direction was inward, and more loads were applied to the cutterhead.

TBM 터널굴착에서 실질적으로 지반을 굴착하는 역할을 하는 부분인 커터헤드는 TBM 순굴진율에 직접적인 영향을 끼치는 중요한 부분이다. 따라서 현장조건과 TBM에 적합한 커터헤드 설계가 이루어져야 한다. 현재까지 수행되어온 커터헤드 설계에 관한 연구는 커터배치에 관한 연구가 대부분이다. 국내에서 동일한 조건에 스크래퍼 설치 방향만 다른 커터헤드가 현장에서 사용되고 있으나 스크래퍼 설치 방향이 TBM 굴진에 어떠한 영향을 끼치는지에 관한 연구를 찾아보기 힘들다. 따라서 본 논문에서는 스크래퍼 설치방향이 쉴드 TBM 굴진에 어떤 영향을 끼치는지 나타내었고 개별요소법을 이용하여 스크래퍼 설치 방향이 쉴드 TBM 굴진에 끼치는 영향을 확인하였다. 스크래퍼 설치 방향이 바깥쪽으로 되어있는 경우, 스크래퍼 설치 방향이 안쪽인 경우보다 커터헤드 개구부로 유입되는 단위시간당 입자의 양이 적으며 커터헤드에 더 많은 부하가 작용하였다.

Keywords

References

  1. Amoun, S., Sharifzadeh, M., Shahriar, K., Rostami, J., Azali, S.T. (2017), "Evaluation of tool wear in EPB tunneling of Tehran Metro, Line 7 Expansion", Tunnelling and Underground Space Technology, Vol. 61, pp. 233-246. https://doi.org/10.1016/j.tust.2016.11.001
  2. Asaf, Z., Rubinstein, D., Shmulevich, I. (2007), "Determination of discrete element model parameters required for soil tillage", Soil and Tillage Research, Vol. 92, No. 1-2, pp. 227-242. https://doi.org/10.1016/j.still.2006.03.006
  3. Das, B.M. (1997). Advanced soil mechanics, Taylor & Francis.
  4. Hertz, H. (1882), "Uber die Beruhrung fester elastischer Korper", Journal fur die reine und angewandte Mathematik, Vol. 92, pp. 156-171. https://doi.org/10.1515/9783112342404-004
  5. Jakobsen, P.D., Lohne, J. (2013), "Challenges of methods and approaches for estimating soil abrasivity in soft ground TBM tunneling", Wear, Vol. 308, No. 1-2, pp. 166-173. https://doi.org/10.1016/j.wear.2013.06.022
  6. Koppl, F., Thuro, K., Thewes, M. (2015), "Suggestion of an empirical prognosis model for cutting tool wear of Hydroshield TBM", Tunnelling and Underground Space Technology, Vol. 49, pp. 287-294. https://doi.org/10.1016/j.tust.2015.04.017
  7. Lee, C., Chang, S.H., Choi, S.W., Park, B., Kang, T.H., Sim, J.K. (2017), "Numerical study of face plate-type EPB shield TBM by discrete element method", Journal of the Korean Geosynthetics Society, Vol. 16, No. 4, pp. 163-176. https://doi.org/10.12814/JKGSS.2017.16.4.163
  8. Li, X., Yuan, D., Huang, Q. (2017), "Cutterhead and cutting tools configurations in coarse grain soils", The Open Construction and Building Technology Journal, Vol. 11, No. 1, pp. 182-199. https://doi.org/10.2174/1874836801711010182
  9. Mindlin, R.D., Deresiewicz, H. (1953), "Elastic spheres in contact under varying oblique forces", Journal of Applied Mechanics, Vol. 20, pp. 327-344. https://doi.org/10.1115/1.4010702
  10. Oh, R.O., Park, S.K., Sung, S.K., Lee, J.Y., Kim, H.H. (2018), "Flexural performance evaluation of fiber reinforced segments with GFRP plate", Journal of Korean Tunnelling and Underground Space Association, Vol. 20, No. 5, pp. 839-854. https://doi.org/10.9711/KTAJ.2018.20.5.839
  11. Ucgul, M., Fielke, J.M., Saunders, C. (2014), "Three-dimensional discrete element modelling of tillage: Determination of a suitable contact model and parameters for a cohesionless soil", Biosystems Engineering, Vol. 121, pp. 105-117. https://doi.org/10.1016/j.biosystemseng.2014.02.005
  12. Wang, L., Kang, Y., Zhao, X., Zhang, Q. (2015), "Disc cutter wear prediction for a hard rock TBM cutterhead based on energy analysis", Tunnelling and Underground Space Technology, Vol. 50, pp. 324-333. https://doi.org/10.1016/j.tust.2015.08.003
  13. Woo, S.J., Yoo, C.S. (2015), "A study on the member forces of segmental linings considering key segments", Journal of Korean Tunnelling and Underground Space Association, Vol. 17, No. 3, pp. 363-382. https://doi.org/10.9711/KTAJ.2015.17.3.363
  14. Yoo, C.S., Jeon, H.M. (2012), "A comparative study on methods for shield tunnel segment lining sectional forces", Journal of Korean Tunnelling and Underground Space Association, Vol. 14, No. 3, pp. 159-181. https://doi.org/10.9711/KTAJ.2012.14.3.159