BEHAVIOR OF SHIELD TUNNEL WITH SECONDARY LINING UNDER EARTHQUAKE MOTION

Current needs to bore tunnels by shield tunneling method is increasing and its application to tunnels under severer site conditions is prevailing. Secondary lining concrete is introduced as one of prospective measures for structural reinforcement required from the conditions. On the other hand, aseismatic design for this type of structure is yet to be established. In this paper, the behaviour of shield tunnel with secondary lining under earthquake motion was clarified by a series of structural analysis through model tests and analytical simulation. The authors have proposed an aseismatic design concept for shield tunnels in longitudinal deflection, based on the aforementioned study on the behaviour of lining concrete and the dynamic characteristics of subsurface structures during earthquake motion.