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.