ABSTRACT
Back-fill grouting is a crucial process in TBM tunnelling. The grouting process determines the loading on the soil and with that an important part of the surface settlement. It also determines the loading on the lining. Field and laboratory measurements (Bezuijen et al. 2004, Bezuijen & Talmon, 2003) have revealed mechanisms that are of importance: the flow of the grout around the tunnel, the yield stress that determines the maximum resistance against the buoyancy forces and the influence of consolidation of the grout on the loading on the lining. The parameters necessary to describe these mechanisms are not given in the traditional grout tests and therefore a new test was developed.
