ABSTRACT
The present paper investigates the impact of geotechnical and structural parameters on the robustness of the tunnel lining capacity, using probabilistic, 2D finite element analysis with the software Abaqus. Seven cross-sections of a mined tunnel are investigated, with similar cross-sectional areas, but varying dimensions and curvatures. Normal and log-normal distributions are assumed, and a Monte-Carlo simulation is used to generate a 1000-point sample of input parameters. The force distribution along the circumference of the tunnel and the lining capacity are assessed on the basis of a sensitivity/parametric analysis. The paper offers a better insight into the design and shape optimization procedure with potential benefits in increased structural reliability, as well as cost savings resulting from improved stress flow in the lining and reduced support requirements due to more informed selections in light of the specific geotechnical circumstances.
