Abstract
Construction of urban tunnels using a tunnel boring machine (TBM) is often favored over drilling-and-blasting based excavation method. Often, TBMs are customized and re-used in fields. However, little effort has been made to verify the status quo of the reused TBM prior to its placement, and no apparatus or method is available to examine the excavation performance of whole, assembled TBMs. Therefore, we present a newly developed apparatus which can examine the excavation performance of small cross-section TBMs with the cutterhead diameter of ∼3.5 m at full scale. The equipment was verified with a rock-like concrete specimen, in which the excavation of TBM was examined while varying the thrust and cutterhead rotational speed. The test results reveal the positive impact of thrust on the penetration rate (PR) and penetration depth (Pe), as well as a linear relationship between PR and the cutterhead speed. This proves that the presented full-scale TBM excavation testing method is capable to produce reliable and remarkably consistent results. The presented full-scale excavation testing method can be used to examine the functionality of a TBM of interest and further explore the effect of different ground conditions, such as rock strength, joints, and weathering, and the effect of different cutterhead design, including the number of cutters, cutter shape, and cutter location.
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Acknowledgments
We would like to thank reviewers for providing valuable comments and suggestions. This research was supported by a grant (20SCIP-B105148-06) from the Construction Technology Research Program funded by the Ministry of Land, Infrastructure, and Transport of the Korean government and a grant funded by Korea Electric Power Corporation (Grant Number: R18SA04).
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Lee, GJ., Ryu, HH., Kwon, TH. et al. A Newly Developed State-of-the-Art Full-Scale Excavation Testing Apparatus for Tunnel Boring Machine (TBM). KSCE J Civ Eng 25, 4856–4867 (2021). https://doi.org/10.1007/s12205-021-2347-0
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DOI: https://doi.org/10.1007/s12205-021-2347-0