THE BORING AND TUNNELLING PROCESS - The Westerschelde Tunnel: Approaching Limits - page 138

11 - THE BORING AND TUNNELLING
PROCESS
E.J. Sonke, M. Roepius and J.A. Stouten
Contents of this chapter:
- Boring through the impermeable block; a toilsome course
- Lunging and sinking of boring shields
- Adaptation of the grout composition
- Excavation front instabilities
- Shield deformations of the westerly and easterly TBMs
- Leakages due to the bentonite valve breaking off (westerly TBM)
- Problems with the tail seal west
- Disaster with the tail seal east
- Ring construction and damages
- Repairing the seal of the main bearing
- Wear and tear of the cutting teeth in glauconitic sand
- Diving activities