Dynamic Response of a Heavy-Haul Railway Tunnel’s Bottom Structures in Hard Rock

A train–tunnel–surrounding rock numerical model was established by using ABAQUS to analyze the dynamic response of a heavy-haul railway tunnel in hard rock, quantify influence train axle load on and determine its potential vulnerable position. The results suggested that: Under 30 t surrounding pressure coupling, maximum principal stress caused 1.27 MPa, located at bottom structure below side drain; base directly rail. lower part drain rail position structure, probability disease under may be higher than that soft-rock tunnels, for it has greater thinner compared tunnel. amplitude were 129.3 kPa 43.0 kPa, respectively. When increased 1 t, structure’s about 4.14 rock’s 1.33 kPa. not negligible analysis tunnel, will decrease, obviously, when is ignored.