応答変位法によるシールドトンネルの地震時断面力の算定法

抄録

This paper presents a calculation procedure to estimate longitudinal seismic stress developed in shield tunnel linings based on seismic deformation method.
Linings of shield tunnels, which have discontinuities in the longitudinal stiffness due to a number of ring-joints, are idealized by uniform beams with the stiffness equivalent to that of segments-joints system. Axial force and bending moment in the tunnel linings subjected to ground displacement with sinusoidal distribution along the tunnel axis are mathematically evaluated considering nonlinearity of lining stiffness.
Factors dominating the seismic stress of shield tunnels are studied. Characteristics of seismic response of shield tunnels is also discussed in comparison with underground pipes with uniform stiffness in axial direction.