BEHAVIOR OF SHIELD SEGMENT RING REINFORCED BY SECONDARY LINING

Abstract

This paper investigates the behavior of shield tunnels reinforced by secondary lining based on experimental results. Test models are composed of notched steel rings with mortar cast-in-place to their interiors.
Concentrated load is applied at the models which are elastically supported. Three major types of the models are experimented; the two of which are one with dowels and the other without dowels between steel and mortar rings, and that the third is a model in which bonding between outer and inner rings are increased by using resin mortar as a secondary lining. Based on the experimental results, analytic model for two-layer structures, the model for composite structures and the model for intermediate state of structures are proposed. Furthermore the study is made on the application of those analytic models to design practice of shield tunnels.