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A preliminary numerical analysis on the behaviour of tunnel under construction in fracture zone considering seismic load

지진 하중을 고려한 단층파쇄대에서의 시공 중 터널 거동 분석에 관한 수치해석적 연구

  • Oh, Dong-Wook (Dept. of Civil Engineering, Seoul National University of Science and Technology) ;
  • Hong, Soon-Kyo (Dept. of Civil Engineering, Seoul National University of Science and Technology) ;
  • Kim, Dae-Kon (Dept. of Civil Engineering, Seoul National University of Science and Technology) ;
  • Lee, Yong-Joo (Dept. of Civil Engineering, Seoul National University of Science and Technology)
  • 오동욱 (서울과학기술대학교 건설시스템공학과) ;
  • 홍순교 (서울과학기술대학교 건설시스템공학과) ;
  • 김대곤 (서울과학기술대학교 건설시스템공학과) ;
  • 이용주 (서울과학기술대학교 건설시스템공학과)
  • Received : 2019.02.12
  • Accepted : 2019.03.08
  • Published : 2019.03.31

Abstract

Recently occurred earthquake Gyeongju and Pohang served as a momentum to remind that Korean peninsular is not a safety zone from earthquake anymore. The importance of seismic design, therefore, have been realized and researches regarding design response spectrum have been actively carried out by many researchers and engineers. Current tunnel seismic design method is conducted to check safety of tunnel structure by dynamic numerical analysis with condition of completed lining installation, so, it is impossible to consider safety of tunnel behavior under construction. In this study, therefore, dynamic numerical analysis considering seismic wave propagations has been performed after back analysis using results from field monitoring of tunnel under construction in fractured zone and 1st reinforcement (shotcrete, rockbolt) behaviour are analyzed. Waves are classified by period characteristic (short and long). As a result, the difference depending on period characteristic is minor, and increasements of displacement are obtained at crown displacement due to seismic wave is 28~31%, 14~16% at left side of tunnel in the fractured zone, 13~27% at right side of tunnel in the bed rock, respectively. In case of shotcrete axial force is increased 113~115% at tunnel crown, 102% at left side, 106~110% at right side, respectively. Displacement and axial force of rockbolts which are selected by type of anchored grounds (only fractured zone, fractured zone and bed rock, only bedrock) are analyzed, as a result, rockbolt which is anchored to fractured zone and bed rock at the same time are weaker than any other case.

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Fig. 1. Representative tunnel cross-section

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Fig. 2. Ground investigation

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Fig. 3. Results from seismic survey

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Fig. 4. Results from electrical resistivity survey

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Fig. 5. Low resistivity zone

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Fig. 6. Back analysis for strength parameter of weathered zone

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Fig. 7. Results from field monitoring

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Fig. 8. Average profile of shear properties for 6 earthquake motions

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Fig. 9. Seismic propagation for numerical analysis

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Fig. 10. Mesh generation

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Fig. 11. Flow chart

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Fig. 12. Displacement for tunnel cross section

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Fig. 13. Normalized displacement

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Fig. 14. Shotcrete axial force

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Fig. 15. Normalized shotcrete axial force

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Fig. 16. Position of analyzed rockbolt

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Fig. 17. Rockbolt displacements

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Fig. 18. Rockblot axial force

Table 1. Strength parameter of weathered zone from back analysis

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Table 2. Material properties of ground elements

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Table 3. Material properties of structure elements

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Table 4. Rayleigh damping coefficient of materials

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Acknowledgement

Supported by : 서울과학기술대학교

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