Effects of distance between tunnel face and shotcrete support on support characteristic curve

Abstract

A sequential excavation analysis was made using an axisymmetric model by varyingthe distance between the tunnel face and the point where shotcrete support was erected as a parameter. As a result, it was found that the point of equilibrium would not be identical with the point of intersection of the support and ground characteristic curves, and that the point of equilibrium on support characteristic curves varied differently near or away from the tunnel face in the case where the distance between tunnel face and shotcrete support was used as a parameter.