ABSTRACT
The activation of the support load of the ground and the interaction with the installed support system must be a key to the stability of the surrounding ground of tunnel. The activation has been illustrated by the Ground Response Curve (GRC) and the Support Response Curve (SRC). GRC is presented as an analytical solution for the problem of stress-displacement around the tunnel in an elasto-perfectly-plastic medium. Displacements are computed from the integration of strains, which are decomposed into elastic and plastic components. A mechanical modeling for shotcrete and steel sets is introduced and the model consists in treating the composite section of a straight beam as a homogenized section of equivalent mechanical properties of the two different materials. SRC is analytically expressed with the force – displacement relation of the composite section. A series of FEM simulation is conducted to represent the interaction between the ground reinforced with rock bolt and the composite liner.
