The paper addresses problems associated with tunnelling in poor ground under high overburden. Prediction of amount of convergence, estimation otcreeping, effects, and selection uf appropriate support, are extremely challenging tasks for the tunnelling engineer. While conventional excavation methods offet a certain flexibility to cope with heterogeneous conditions, TBMs still have to be improved to successfully master fault zones in Alpine tunnels. Emphasis in this paper is put to recent developments in short term prediction of rock mass behaviour, prediction of tunnel closure, and ductile supports.
The paper addres …
AUTORI: Schubert W., Moritz B., Sellner P. RIG ANNO: 1999 NUMERO: 1 Numero di pagina: 16