MODELING THE STRESS–STRAIN BEHAVIOR OF UTILITY TUNNEL STRUCTURES BENEATH A HIGHWAY
DOI:
https://doi.org/10.31649/2311-1429-2026-1-18-28Keywords:
utility tunnel, deformation block, stress–strain state, earth embankment, road pavement, dynamic vehicular loadAbstract
The paper presents rational structural solution for a deep utility tunnel intended for the installation of utility networks beneath the highway overpass. Among the considered alternatives, the most rational solution of tunnels structure has been chosen – namely, a monolithic frame U-shaped structure on slab foundations. The necessity and feasibility of reinforcing tunnel sections embedded at depths exceeding 5 m have been substantiated by means of installing a system of external buttresses. The proposed engineering solutions are realized into a designed utility tunnel beneath an embankment of an overpass in the Vinnytsia city. Finite element models of the stress–strain state have been developed using the standard software package LIRA-SAPR, taking into account soil conditions, pressures of earth backfill and live loads from vehicular traffic. The most unfavorable load combinations have been evaluated. It has been demonstrated that, for tunnel sections under the large soil layer, the dominant influence is exerted specifically by the earth embankment. It has been demonstrated that shallow tunnel sections require the installation of transition structures to equalize the stiffness of the subgrade beneath the pavement.
For the proposed structural configuration of the tunnel, rational geometric parameters have been selected according to the described methodology, and the most critical cross-sections have been identified. It has been demonstrated that the most heavily loaded structural elements of the tunnel are beam structures at the interfaces between the tunnel and adjacent ventilation chambers, the beam (girder) system supporting the tunnel roof slab, as well as the foundation slab structures beneath the openings. The performed analyses confirm, in terms of strength and stiffness, the fundamental feasibility and rationality of the proposed tunnel structural solution as well as the use of tunnel structures as temporary shelter.
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