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Investigation for the deformation behavior of the precast arch structure in the open-cut tunnel

개착식 터널 프리캐스트 아치 구조물의 변형 거동 연구

  • Kim, Hak Joon (Dept. of Construction Safety and Disaster Prevention, Daejeon University) ;
  • Lee, Gyu-Phil (Integrated Road Management Research Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Lim, Chul Won (New Business Development Department, Freyssinet Korea)
  • 김학준 (대전대학교 건설안전방재공학과) ;
  • 이규필 (한국건설기술연구원 도로관리통합센터) ;
  • 임철원 (후레씨네 코리아 신사업 개발부)
  • Received : 2018.10.30
  • Accepted : 2018.11.21
  • Published : 2019.01.31

Abstract

The behavior of the 3 hinged precast arch structure was investigated by comparing field measurements with numerical analyses performed for precast lining arch structures, which are widely used for the open-cut tunnel. According to the field measurements, the maximum vertical displacement occurred at the crown with upward displacements during the backfilling up to the crown of the arch and downward displacements at the backfill height above the crown. The final crown displacement was 19 mm upward from the original position. The horizontal displacement at the sidewall, which had a maximum horizontal displacement, occurred inward of the arch when compacting the backfill up to the crown and returned to the original position after completing the backfill construction. According to the analysis of displacement measurements, economical design is expected to be possible for precast arch structures compared to rigid concrete structures due to ground-structure interactions. Duncan model gave good results for the estimation of displacements and deformed shape of the tunnel according to the numerical analyses comparing with field measurements. The earth pressure coefficients calculated from the numerical analyses were 0.4 and 0.7 for the left and the right side of the tunnel respectively, which are agreed well with the eccentric load acting on the tunnel due to topographical condition and actual field measurements.

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Fig. 1. Detailed view of precast arch members

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Fig. 2. A precast arch structure used for this study

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Fig. 3. Standard cross section of the precast arch structure used for this study

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Fig. 4. Backfill compaction zones surrounding the precast concrete arch structure

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Fig. 5. Longitudinal diagram of the precast arch structure

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Fig. 6. Installed location of strain gauges in steel bars for the left arch

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Fig. 7. Location and view of targets for displacement measurements

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Fig. 8. Results of vertical displacement measurements

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Fig. 9. Comparison of vertical displacements obtained from field measurements and numerical analyses

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Fig. 10. Results of horizontal displacement measurements

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Fig. 11. Comparison of horizontal displacements obtained from field measurements and numerical analyses

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Fig. 12. Comparison of deformed shape obtained from numerical analyses with field measurements

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Fig. 13. Comparison of calculated lateral earth pressure changes using two methods

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Fig. 14. Displacement diagrams of the precast concrete arch structure using numerical analyses

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Fig. 15. Changes of coefficients of earth pressure in points D and H

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Fig. 16. Stress distributions around a precast arch structure after completion of construction

Table 1. Strength parameters used for the numerical analysis

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Table 2. Numerical analyses procedures according to construction stages

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Table 3. Comparison of displacements obtained from field measurements and numerical analyses (unit: mm)

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