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April 10, 2026Geomechanics and Tunnelling

SBT – TBM excavation with a single‐shield machine in unstable and squeezing ground – Excavation and investigation measures

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Authors

AMAlexander MeierMPMichael PoppRVRobert Vaněk

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Overview

Investigative measures improve tunneling performance in unstable geological environments, indicating key insights for future projects.

Key Points

  • The study aims to enhance excavation efficiency in unstable ground using targeted geological investigations and countermeasures.
  • Applied rotary-percussive drilling to assess challenging ground areas.
  • Evaluated effectiveness of supplementary and special excavation measures.
  • Compared effectiveness of injection pipe umbrella and foam injection methods.
  • Foam injection was highly effective for stabilizing ground and filling voids.
  • Injection pipe umbrella showed limited effectiveness due to groundwater and technical constraints.
  • Flexible support measures significantly improved excavation performance in difficult geological conditions.

Cite This Study

Meier et al. (2026) studied this question.

synapsesocial.com/papers/69d896a46c1944d70ce083cfhttps://doi.org/10.1002/geot.70083
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