A Mathematical Model of a Large-Diameter Tunnel Block Lining

Purpose: To evaluate the stress-strain state of a double-track interstation tunnel lining on the Nevsko- Vasileostrovskaya line of St. Petersburg Metro. Methods: Mathematical modelling by the finite element method and comparing the results with the field geodetic measurements. Results: A model has been created for a monolithic ring lining with the same rigidity. The lining with joints between the blocks has been modelled in two ways by using interfaces and elastic gaskets in the joints. The results of mathematical model and those of field geodetic measurements have been compared. Thus, the most rational model of the block lining joints has been determined. The stress-strain state has been evaluated in terms of safety and deformation margin. Practical significance: The results of the study can be used at the design stage of precast reinforced concrete lining structures for large-diameter tunnels, and at the stage of maintenance monitoring to predict changes in the lining stress-strain state.