Discussion: Face stabilisation of shallow tunnels using fibreglass dowels

摘要

I would like to thank Professor Oreste for adding to the literature on this subject.rnI would suggest, however, that the results of the proposed method, as well as other similar limit equilibrium methods (LEM), are very sensitive torn(a) the shape of the collapse surface above and below the tunnel roofrn(b) the angle of shear resistance (peak, residual or intermediate?)rn(c) the cohesion intercept (peak, residual or intermediate?)rn(d) the limit shear stress along the failure surfacesrn(e) the limit shear stress at the mortar-ground interface, outside and inside the unstable blockrn(f) the water table levelsrn(g) the position of the fibreglass dowels on the excavation facern(h) the drilling hole diameterrn(i) the safety factor (F_s) passing from T_(lim)to T_(adm).