Buffer structure of single-track tunnel portal of high-speed rail

Abstract

The invention provides a buffer structure of a single-track tunnel portal of a high-speed rail. The buffer structure is characterized in that the buffer structure is used for the single-track tunnel of the high-speed rail and is a rectangular hole body lining and butting with the tunnel portal, the rectangular hole body is positioned at the outer side of the tunnel portal, and the cross section of the rectangular hole body is rectangular; one to eight openings are arranged at the top part of the rectangular hole body in the length direction of the rectangular hole body, and the area ratio of the total area of the openings and the area of the hollow cross section of a portal lining is 0.75-2; and the area of the openings arranged in the length direction of the rectangular hole body is gradually reduced to the tunnel portal direction according to 50-90 percent. The buffer structure can effectively relieve the micro-pressure wave phenomenon of the tunnel portal of the high-speed rail and prevents the sonic boom generated by the tunnel portal from generating bad influence on surroundings, and the social effect is significant. As the buffer structure has the advantages of simple structure, strong integrity, strong applicability to terrain and geological conditions and convenience in construction, the production cost caused by the buffer structure arranged at the portal can be effectively reduced, and the economic benefit is significant.

Description

technical field [0001] The invention relates to the field of high-speed railway tunnels, in particular to an opening buffer structure of a high-speed railway single-track tunnel. Background technique [0002] When a high-speed train enters a tunnel, the space in front of the train is limited, causing the air in front of the train to fail to spread around in time and be compressed sharply to form an air compression wave. The compression wave travels to the tunnel exit at the speed of sound, about 90% of it is reflected back to the tunnel entrance in the form of expansion waves, and the other 10% of the energy is radiated from the tunnel exit to the surrounding area in the form of pulse-like shock waves, forming micro-pressure Wave. If the micro-pressure wave effect is too strong, it will produce aerodynamic blasting noise, that is, tunnel sonic boom, and cause problems such as rapid vibration of nearby light structures (house windows), resulting in noise pollution, negative ...

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Problems solved by technology

[0003] However, the existing tunnel buffer structure is mainly for the effective area above the rail surface of 100m 2 left and right large-section double-lane tunnel design, and for 65m 2 Left and right small cross-section single-lane tunnels are not applicable

Moreover, the existing buffer structure at the entrance of the tunnel can only control the peak value of the micro-pressure wave at 20m outside the tunnel entrance within 50Pa, which cannot meet the strict control standard of the peak pressure of the micro-pressure wave.

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