Numerical simulation for surface settlement considering face vibration of TBM tunnelling in mixed-face condition

Chang-Won Kwak; Inn-Joon Park

doi:10.9711/KTAJ.2015.17.3.333

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Numerical simulation for surface settlement considering face vibration of TBM tunnelling in mixed-face condition 복합지반에서 TBM 굴진 진동을 고려한 지표침하에 대한 수치모델링

31 May 2015. pp. 333-339

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Abstract

In this paper, the surface settlement resulted from the shallow TBM tunnelling has been numerically simulated. TBM tunnelling is especially used in urban area to avoid serious vibration and noise caused by explosion in NATM. Surface settlement is one of the most important problems encountered in all tunnelling and critical in urban areas. In this study, face vibration of TBM excavation is considered to estimate surface settlement trend according to TBM extrusion. The dynamic excavation forces are calculated by total torque on the TBM cutterhead in mixed-face of soil and weathered rock condition with shallow depth. A 3-dimensional FDM code is employed to simulate TBM tunnelling and mechanical-dynamic coupling analysis is performed. The 3D numerical analysis results showed that dynamic settlement histories and trend of surface settlement successfully. The maximum settlement occurred at the excavation point located at 2.5D behind the face, and the effect of face vibration on the surface settlement was verified in this study.

Keywords

Surface settlement

TBM

Face vibration

Mixed-face

Mechanical-dynamic coupling analysis

본 연구는 도심지 천층터널에서 현재까지 해석에서 무시되던 막장면 진동이 주위 구조물에 가장 큰 영향을 미치는 지표 침하에 대하여 3차원 수치해석을 이용하여 모델링하였다. 풍화토와 풍화암이 각각 50%의 비율로 구성된 복합지반을 고려하여 TBM 커터헤드에 발생하는 굴착시 토크를 산정하여 이를 시간에 따라 막장면에 재하함으로서 그 영향을 수치해석적으로 관찰하였다. 3차원 유한차분해석법을 이용하여 역학-동역학 연계해석을 통하여 지표침하 발생이력 및 분포도를 산정하였다. 연구결과, 3차원 수치해석을 통하여 막장면 진동하중에 의한 지표침하 발생경향을 성공적으로 모델링할 수 있었으며 최대 침하는 막장면에서 2.5D 후방에서 발생함을 확인하였고, 막장면 진동이 실제 지표침하에 영향을 미침을 확인하였다.

키워드

지표침하

TBM

막장면 진동

복합지반

역학-동역학 연계해석

References

1.Jafari, M.J., Gharari, N., Sheikhi, H.R. (2009), “The reliability of a tunnel boring machine”, International Journal of Occupational Hygiene, Vol. 1, No. 1, pp. 21-26.

2.Kim, Y.M., Lee, S.D., Choo, S.Y., Koh, S.Y. (2013), “An experimental study on shield TBM tunnel face stability in soft ground”, Journal of the Korean Society for Railway, Vol. 16, No. 1, pp. 47-51.

3.Kim, C.P. (2004), “A study on the load distribution factor in two-dimensional analysis model for the simulation of three-dimensional effect of EPB shield tunnel”, M. S Dissertation, Kyonggi University.

4.Steingrimsson, J.H., Grøv, E., Nilsen, B. (2002), “The significance of mixed-face conditions for TBM performance”, World Tunnelling, Vol. 15, No. 9, pp. 435-441

5.Zhang, K., Yu, H., Liu, Z., Lai, X. (2010), “Dynamic characteristic analysis of TBM tunnelling in mixed-face conditions”, Simulation Modeling Practice and Theory, Vol. 18, pp. 1019-1031.

Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 17
No :3
Pages :333-339
Received Date : 2015-04-20
Revised Date : 2015-05-01
Accepted Date : 2015-05-06
DOI :https://doi.org/10.9711/KTAJ.2015.17.3.333

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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