The pavement in the tunnel uses a c

The pavement in the tunnel uses a composite pavement structure in the form of: asphalt concrete for the surface layer, 4cm thick superpave-13 fine-grained high-performance modified asphalt concrete, and the middle surface layer is 6cm thick superpave-20 medium grain High-performance modified asphalt concrete. The bottom is set to a 24cm thick cement concrete panel, and its design flexural tensile strength cannot be less than 5.0MPa. The base is made of 18cm thick C20 concrete; the road surface of the vehicle cross hole uses a 20cm thick water mud concrete surface layer, and the 15cm thick C20 Concrete base. Pavement of cross-hole pedestrian road uses 20cm thick C20 concrete.