Deformation Control Standard of Utility Tunnel Based on Crack Control Standard

The construction of underground utility tunnel is being carried out on a large scale in China, however there is no corresponding control standard for the structural deformation of utility tunnel, so it is very necessary to establish the deformation standard of utility tunnel. In this paper, the maximum longitudinal bending moment of utility tunnel and the maximum stress of reinforcement controlled by cracks were used to establish the longitudinal deformation standard of utility tunnel structure. In addition, numerical simulation was used to analyze the deformation characteristics of underground composite utility tunnel under different section sizes and soils. And simulation results indicate that the crack reached its maximum of 0.2mm when maximum deformation curvature of utility tunnel was 2.12025*10⁻5.