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An analysis of excavation cycle time for Korean tunnels and the comparison with the Standard of Construction Estimate

국내터널 굴착 사이클타임에 대한 분석결과와 표준품셈과의 비교

  • Kim, Yangkyun (Resources Development Institute, Hanyang University) ;
  • Kim, Hyung-Mok (Department of Energy and Mineral Resources Engineering, Sejong University) ;
  • Lee, Sean S. (Department of Earth Resources and Environmental Engineering, Hanyang University)
  • 김양균 (한양대학교 자원개발연구소) ;
  • 김형목 (세종대학교 에너지자원공학과) ;
  • 이승원 (한양대학교 자원환경공학과)
  • Received : 2018.11.28
  • Accepted : 2018.12.24
  • Published : 2019.01.31

Abstract

Estimating tunnel construction time and costs are the most fundamental part of a tunnel project planning, which has been generally assessed on a deterministic basis until now. In this paper, excavation cycle time was investigated for two road tunnels and one subway tunnel, and the results were compared with the Standard of Construction Estimate (SE), which is made for the estimation of construction time and cost in a design stage. The results show that the difference in cycle time between SE and actual cycle time is 50%, 7% and 31% respectively for the three tunnels, which means that SE does not reflect practical operation time. The major reasons of the difference are skilled level of tunneling workers, the change of operation sequences for more effective operations, much more complicated working atmosphere in a tunnel than the assumption of SE etc. Finally, even though the results can not be generalized since investigated tunnels are only 3, but it is thought that SE needs to be upgraded into the model able to consider quite common situations through additional tunnel investigation and studies in the future.

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Fig. 1. Possibility of total construction time and cost estimates (Špačková, 2012)

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Fig. 2. Cross section shapes and drill patterns of the investigated tunnels

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Fig. 3. Comparison of cycle time for the 3 tunnels

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Fig. 4. Ranges of operation time in actual operations and by SE

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Fig. 5. Comparison of the ranges of cycle time in actual operations and by SE

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Fig. 6. Drilling & charging part of TUNSIM-Q for the estimation of basic construction time

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Fig. 7. Flow to estimate the basic construction time in TUNSIM-Q (Kim and Bruland, 2009)

Table 1. Summary of the investigated tunnels

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Table 2. Cycle time by the Standard of Construction Estimate (MOLIT and KICT, 2018)

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Table 3. Definition of tunnel type (MOLIT and KICT, 2018)

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Table 4. Drilling rate of drilling jumbos (MOLIT and KICT, 2018)

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Table 5. Typical range of load factor

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Table 6. Results of the variables defined in Table 2

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Table 7. Comparison of operation time in actual operations and by SE

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Acknowledgement

Supported by : 한양대학교

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