지반조건과 이음부 특성의 변화에 따른 쉴드터널 라이닝의 거동

Abstract

The shield-driven tunneling method has been widely adopted for the construction of urban underground tunnels in soft and collapsed ground due to its flexibility, cost effectiveness and the minimum impact on ground traffic and surface structures. Recently, jointed segmental precast concrete linings connected by steel bolts are commonly used instead of steel or cast iron segments in most shield-driven tunnels. As the lining of a shield-driven tunnel is not a continuous ring structure due to the existence of joints, the effects of the joints on internal forces and displacements should be taken into consideration in the design of the tunnel lining. This study estimated joint characteristics of jointed shield-driven segment lining by comparing the results of analytical solutions using force method and numerical analysis simulating FEM program in order to determine the internal forces and displacements of jointed shield-driven tunnels. Factors such as joint stiffness, soil resistance, joint distribution, number of joints can be considered in the proposed method.