Investigations for a Convergence Compatible Lining System

摘要

Under »squeezing« conditions, a tunnel lining must have a certain structural capacity but also should allow a controlled development of deformations. The idea to use precast segments with external ribs was already presented. Laboratory tests showed the expected and intended characteristic of an initial stiff phase when the ribs get in touch with the rock, followed by a rather ductile deformation phase and a final stiff reaction again when the segments are fully in contact with the rock mass.