Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Numerical Study on Medium-Diameter EPB Shield TBM by Discrete Element Method

개별요소법을 이용한 중단면 토압식 쉴드TBM의 수치해석 연구

  • Choi, Soon-Wook (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Byungkwan (Smart City & Construction Engineering, University of Science and Technology) ;
  • Kang, Tae-Ho (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Chang, Soo-Ho (Construction Startup Promotion Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Chulho (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology)
  • Received : 2018.11.11
  • Accepted : 2018.12.03
  • Published : 2018.12.30
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Abstract

The Discrete Element Method (DEM) has been widely used in granular material researches. Especially, if material has a large deformation, such as ground, it can be a useful method to analyze. In this study, to simulate ground formations, DEM was used. The main purpose of DEM analysis was to investigate the numerical model which can predict the TBM performance by simulating excavating procedure. The selected EPB TBM has a 7.73 m of diameter and six spokes. And two pre-defined excavation conditions with the different rotation speeds per minute (RPM) of the cutterhead was applied. In the modeled cutterhead, the open ratio of cutterhead was 21.31% and number of cutters (including disc cutter and cutter bit) was 219. From the results, reaction forces and resistant torques at the cutterhead face and cutting tools, were measured and compared. Additionally the muck discharge rate and accumulated muck discharge by the screw auger were evaluated.

개별요소법은 입자형태의 재료를 다루는 분야에서 널리 사용되는 방법이다. 특히, 지반에서와 같이 변형이 크게 발생하는 특성을 지닌 재료의 경우에도 유용하게 사용할 수 있는 해석방법 중 하나이다. 본 연구에서는 개별요소법을 사용하여 지반을 생성하고 지반에 TBM 형상을 관입시킴으로써 굴진을 모사하고자 하였다. 해석에 사용된 TBM은 7.73m 직경의 토압식 쉴드 TBM을 사용하였으며 해석을 통해 굴진 성능을 예측할 수 있는 수치해석 모델을 검토하고자 하였다. 대상 모델의 스포크 개수는 8개이며, 커터헤드의 개구율은 약 21.31%이다. 또한, 커터헤드에는 52개 디스크 커터와 167개 커터비트가 굴착 도구로 장착되어 있으며, 커터헤드는 게이지 커터가 장착된 커터헤드 외주면이 굴곡진 세미돔 타입이다. 해석을 통해 커터헤드와 각각의 절삭 도구에 작용하는 반력과 저항 토크를 검토할 수 있었다. 또한 커터헤드 중심에서부터 거리에 따른 비교를 통해 커터헤드의 절삭 도구 위치별로 발생하는 반력과 토크를 검토하였다.

Keywords

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Fig. 1. Cross-sectional diagram of a target site

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Fig. 2. Evaluation of particle contact properties by simulating the direct shear test

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Fig. 3. Dimension of 3D numerical ground model

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Fig. 5. Numerical model of 3D TBM model

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Fig. 4. Front and side view of cutterhead

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Fig. 6. TBM excavation setting for simulation

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Fig. 7. Total number of particles at each TBM parts

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Fig. 8. Mass flow rate at the screw auger

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Fig. 9. Resistant torque at the screw auger

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Fig. 12. Average force at the disc cutter

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Fig. 10. Total force at the cutterhead during excavation

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Fig. 11. Total torque at the cutterhead during excavation

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Fig. 13. Average resistant torque at the disc cutter

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Fig. 14. Total force at the disc cutter by radius

Table 1. Range of design strength parameter for weathered soil in selected site

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Table 2. DEM parameters for particle and particle-particle properties

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Table 3. DEM parameters for TBM and TBM-particle properties (Ucgul et al., 2014)

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Table 4. Motion conditions of TBM parts during its advance

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References

  1. Amoun, S., Sharifzadeh, M., Shahriar, K., Rostami, J. and Azali, S. T. (2017), "Evaluation of tool wear in EPB tunneling of Tehran Metro, Line 7 Expansion", Tunnelling and Underground Space Technology, Vol.61, January 2017, pp.233-246. https://doi.org/10.1016/j.tust.2016.11.001
  2. Avunduk, E. and Copur, H. (2018), "Empirical modeling for predicting excavation performance of EPB TBM based on soil properties", Tunnelling and Underground Space Technology, Vol.71, January 2018, pp.340-353. https://doi.org/10.1016/j.tust.2017.09.016
  3. Bandini, A., Berry, P., Cormio, C., Colaiori, M. and Lisardi, A. (2017), "Safe excavation of large section tunnels with Earth Pressure Balance Tunnel Boring Machine in gassy rock masses: The Sparvo tunnel case study", Tunnelling and Underground Space Technology, Vol.67, August 2017, pp.85-97. https://doi.org/10.1016/j.tust.2017.05.001
  4. Copur, H., Aydin, H., Bilgin, N., Balci, C., Tumac, D. and Dayanc, C. (2014), "Predicting performance of EPB TBMs by using a stochastic model implemented into a deterministic model", Tunnelling and Underground Space Technology, Vol.42, May 2014, pp.1-14. https://doi.org/10.1016/j.tust.2014.01.006
  5. Cundall, P. A. (1971), A computer model for simulating progressive, large scale movement in blocky rock systems, In Proceedings of the International Symposium on Rock Mechanics. Vol.2, pp.129-136.
  6. Cundall, P. A. and Strack, O. D. (1979), A discrete numerical model for granular assemblies, geotechnique, Vol.29, No.1, pp.47-65. https://doi.org/10.1680/geot.1979.29.1.47
  7. Gharahbagh, E. A., Mooney, M. A., Frank, G., Walter, B. and Di Ponio, M. A. (2013), "Periodic inspection of gauge cutter wear on EPB TBMs using cone penetration testing", Tunnelling and Underground Space Technology, Vol.38, September 2013, pp.279-286. https://doi.org/10.1016/j.tust.2013.07.013
  8. Herrenknecht. (2008), EPB Shield. Fast tunnelling technology with a broad application range, Herrenknecht, Germany.
  9. ITA, W. (2000), Mechanized Tunnelling: Recommendations and Guidelines for Tunnel Boring Machines (TBMs), Publication No. MAI 2001 - ISSN 1267-8422, International Tunnelling Association, Lausane, Switzerland.
  10. KICT. (2015), Development of optimized TBM cutterhead design method and high-performance disc cutter, Publication No. ISBN 979-11-954377-2-6, Korea Agency for Infrastructure Technology Advancement, Anyang-si, Republic of Korea. (in Korean)
  11. Lee, C., Chang, S. H., Choi, S. W., Park, B., Kang, T. H. and Sim, J. K. (2017a), Preliminary study on a spoke-type EPB shield TBM by discrete element method, Journal of Korean Tunnelling and Underground Space Association, Vol.19, No.6, pp.1029-1044. (in Korean) https://doi.org/10.9711/KTAJ.2017.19.6.1029
  12. Lee, C., Chang, S. H., Choi, S. W., Park, B., Kang, T. H. and Sim, J. K. (2017b), 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. (in Korean) https://doi.org/10.12814/JKGSS.2017.16.4.163
  13. Shi, H., Yang, H., Gong, G. and Wang, L. (2011), Determination of the cutterhead torque for EPB shield tunneling machine. Automation in Construction, Vol.20, No.8, pp.1087-1095. https://doi.org/10.1016/j.autcon.2011.04.010
  14. Maidl, U. and Comulada, M. (2011), "Prediction of EPB shield performance in soils", Proc. of the In Rapid Excavation and Tunneling Conference, January 2011, pp.1083-1091.
  15. Maynar, M. J. and Rodriguez, L. E. (2005), "Discrete numerical model for analysis of earth pressure balance tunnel excavation", Journal of Geotechnical and Geoenvironmental Engineering, Vol.131, No.10, pp.1234-1242. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:10(1234)
  16. Peng, B. (2014), Discrete element method (DEM) contact models applied to pavement simulation, Ph.D Thesis, Virginia Polytechnic Institute and State University, pp.19-23.
  17. Peila, D., Picchio, A. and Chieregato, A. (2013), "Earth pressure balance tunnelling in rock masses: Laboratory feasibility study of the conditioning process", Tunnelling and Underground Space Technology, Vol.35, April 2013, pp.55-66. https://doi.org/10.1016/j.tust.2012.11.006
  18. Ucgul, M., Fielke, J. M. and Saunders, C. (2014), Threedimensional discrete element modelling of tillage: Determination of a suitable contact model and parameters for a cohesionless soil, Biosystems Engineering, Vol.121, May 2014, pp.105-117. https://doi.org/10.1016/j.biosystemseng.2014.02.005
  19. Wassgren, C. and Sarkar, A. (2008), "PSL DEM Lecture 06: Introduction to Soft-Particle DEM and Normal Contact Force Models - Part I.
  20. Wu, L., Guan, T. and Lei, L. (2013), "Discrete element model for performance analysis of cutterhead excavation system of EPB machine", Tunnelling and Underground Space Technology, Vol.37, August 2013, pp.37-44. https://doi.org/10.1016/j.tust.2013.03.003
  21. Wu, L. and Liu, C. (2014), "Modeling of shield machine tunneling experiment by discrete element method", Applied Mechanics and Materials, Vols.556-562, pp.1200-1204. https://doi.org/10.4028/www.scientific.net/AMM.556-562.1200

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