ABSTRACT
The GPRRM for ground reinforcement has been commonly applied in tunnelling under difficult ground conditions, with satisfactory results. Previous experience on the use of the technique has shown effective reductions on potentially large tunnel convergence, ground settlement and water inflow (KICT, 1986; Societa Italiana Gallerie, 1991; Pelizza and Pelia, 1993; Pelia, 1994; Bae et al., 1997). However, due to the geometrical and mechanical complexity of the problem, there have been very few attempts to analyse this problem and no adequate method for determining the design parameters of the reinforcement system has been developed.
