<p>The application of flexible supporting materials in squeezing large deformation tunnels can play a role in buffer yielding and prevent the deformation and failure of tunnel lining. In order to prepare a flexible support material suitable for squeezing large deformation tunnels, a flexible support material—foam-fiber concrete with large deformation, high ductility and good energy absorption characteristics was prepared by orthogonal test. The foam-fiber concrete was subjected to uniaxial (triaxial) compression test, digital image correlation technology analysis and microscopic analysis. In order to evaluate the buffer yielding support effect of foam-fiber concrete material in squeezing large deformation tunnel, the foam-fiber concrete is applied to the tunnel shallow buried entrance section and the deep buried middle section in two forms by numerical simulation. Compared with the traditional rigid support form, foam-fiber concrete as a flexible support material can effectively absorb the squeezing large deformation of surrounding rock, ensure the integrity of the lining structure, and make the tunnel in a safe and stable state for a long time. The field application results show that the foam-fiber concrete flexible support material can be effectively applied to control the squeezing deformation of large deformation tunnels.</p>