Abstract
The HuaiFu tunnel section of Shenzhen Metro Line 12 is located in Baoan District, Shenzhen, with a total length of approximately 1750 m. The excavated grounds are extremely complicated, with soft soil ground, mixed ground, fault zones, and hard rock ground with a length of over 1200 m. A dual-mode shield TBM with EPB and single-shield modes was employed in the tunnel section. To evaluate the tunnelling performance of the dual-mode shield TBM, two sets of monitoring systems were applied to acquire the cutterhead working performance during the dual-mode shield TBM tunnelling, and the tunnelling difference between the dual-mode shield TBM and composite EPB shield in hard rock ground were analysed. As for the cutterhead working performance, relative sliding occurred between the cutter and tunnel face, and the cutter wear curve increased linearly in any ground and excavation modes. Under different grounds and excavation modes, the cutterhead temperature thresholds were different, and the time-domain and frequency-domain of the cutterhead vibration were different. As for the tunnelling difference, the single-shield mode offered a higher penetration rate, fewer cutter replacements, lower energy consumption and faster advance rate than the EPB mode. The advance rate of EPB mode was higher than that of the composite EPB shield due to the faster cutterhead rotation speed. The results can provide guidance for excavation mode selection of the dual-mode shield TBM and type selection of TBM for similar grounds.
Highlights
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The differences between two excavation modes of the dual-mode shield TBM were analysed.
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The cutterhead working performance of the dual-mode shield TBM in different grounds was obtained.
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The tunnelling performance for the dual-mode shield TBM and composite EPB shield were compared.
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The data that support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
This study was supported by the Power Construction Corporation of China (Contract No. DJ-ZDXM-2018-03).
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Conceptualization: [FW] and [QG]; methodology: [QG] and [FW]; formal analysis and investigation: [QG] and [FW]; writing—original draft preparation: [FW] and [QG]. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Wu, F., Gong, Q., Li, Z. et al. Study on Tunnelling Performance of Dual-Mode Shield TBM by Cutterhead Working Performance and Tunnelling Difference Comparison: A Case in Shenzhen Metro Line 12. Rock Mech Rock Eng 56, 5315–5333 (2023). https://doi.org/10.1007/s00603-023-03328-w
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DOI: https://doi.org/10.1007/s00603-023-03328-w