#5614. Numerical investigation of a segmental grey cast iron tunnel ring: validation with laboratory data and application to field conditions

August 2026publication date
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Journal’s subject area:
Geotechnical Engineering and Engineering Geology;
Computer Science Applications;
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Abstract:
The structural response of a segmental grey cast iron (GCI) tunnel lining ring under distortion was investigated by means of finite element (FE) analysis. Building on previous experimental investigations, a 3D numerical model, capable of reproducing accurately the behaviour observed in the laboratory, was developed with the aim of providing guidelines for the structural assessment of GCI linings in engineering practice. A comprehensive validation of the segmental ring model with the laboratory data was first completed. Subsequently, a parametric study was conducted using a set-up that replicated the widely adopted elastic continuum method, so that differences between the numerical and the analytical solution could be attributed to the presence of the longitudinal joints.
Keywords:
Bending stiffness reduction factor; Grey cast iron; Segmental lining; Tunnel joints

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