Effect of increased linings on micro-pressure waves in a high-speed railway tunnel

•The MPW is studied by three different methods.•The rules governing the effect of increased linings on MPWs are obtained.•The MPW for the CRH2C is greater than that for the CRH380A.•Using increased linings to repair tunnel damage in high-speed railways is suggested.

A micro-pressure wave (MPW) is generated when a train enters a tunnel at high speed, which causes a strong impact on the environment around the tunnel. The increased lining used to repair damage in high-speed railway tunnels changes cross-sections and has a strong influence on the MPW at the tunnel exit. In this paper, the methods of full-scale measurement, numerical simulation and moving-model experiments are used to study the MPW generated in a tunnel whose lining is increased. The rules governing the effect of increased linings on MPWs are obtained, which can be used as a reference for the Tunnel Damage Regulation Project in China.