High-speed railway single-track tunnel portal buffer structure

The utility model provides a high-speed railway single-track tunnel portal buffer structure, which is characterized in that the buffer structure is used for a high-speed railway single-track tunnel, and is a rectangular body with a rectangular cross section butted with a tunnel portal lining and located at the outer side of a tunnel portal; 1-8 openings are formed at the top of the rectangular body along the length direction of the rectangular body; the ratio of the total area of the openings to the cross sectional area in the portal lining is 0.75-2; and the areas of the openings distributed along the length direction of the rectangular body gradually reduce towards the tunnel portal direction by 50-90%. The high-speed railway single track tunnel portal buffer structure can effectively alleviate the phenomenon of micro-pressure waves at the high-speed railway tunnel portal, prevents sonic boom generated at the tunnel portal from affecting the surrounding environment, and has significant social effects. As the buffer structure is simple in structure, good in integrity, highly applicable to terrain and geological conditions and convenient for construction, the production cost caused by arrangement of the buffer structure at the portal can be effectively reduced, and remarkable economical effects are achieved.