Volume loss and soil dilatancy

Grouting of the tail gap is a usual practise in shield tunnelling. It is often believed that this procedure can reverse or at least reduce the settlement trough above the tunnel. This view can be supported by numerical simulations with a simple elasto-plastic (Mohr-Coulomb) model. However, using a more realistic hypoplastic constitutive equation it can be shown that the grouting at first causes additional settlements. This can be explained by the contractant behaviour of drained soil, which appears pronouncedly after deformation reversals.

Grouting of the tail gap is a usual practise in shield tunnelling. It is often believed that this procedure can reverse or at least reduce the settlement trough above the tunnel. This view can be supported by numerical simulations with a simple elasto-plastic (Mohr-Coulomb) model. However, using a more realistic hypoplastic constitutive equation it can be shown that the grouting at first causes additional settlements. This can be explained by the contractant behaviour of drained soil, which appears pronouncedly after deformation reversals.


Grouting of the …


AUTORI: Maehr M., Herle I.
RIG ANNO:2003 NUMERO:4
Numero di pagine: 32


Allegato: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2004_4_032.pdf
Allegato:
Articolo completo: https://associazionegeotecnica.it/wp-content/uploads/2010/03/RIG_2004_4_032.pdf