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http://dx.doi.org/10.9711/KTAJ.2019.21.1.137

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

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)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.1, 2019 , pp. 137-153 More about this Journal
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.
Keywords
Tunnel blasting; Cycle time; Standard of Construction Estimate; NTNU estimation model;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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