Damage Research of the Cut-and-Cover Tunnel under Static and Seismic Load

This article uses the finite element software ABAQUS to establish an damage constitutive model for cut-and-cover tunnels, which studies the damage parameters for different filling heights under static load and damage evolution under seismic load. It is found that high filling has a significant impact on the damage of cut-and-cover tunnels, and earthquake waves affect the degree and distribution of lining damage. By studying the model of setting the LRL, it was found that it can effectively reduce the degree of damage. Therefore, it is necessary to set a LRL for high backfill cut-and-cover tunnels. And the damage parameters of different parts of the cut-and-cover tunnel are analyzed, and it was found that the arch crown and arch shoulder of the cut-and-cover tunnel were the most prone to damage. Therefore, reinforcement measures should be taken in the structural design.