The train through the railroad tracks, the tracks will undergo a certain deformation, and produce vibration, and gravel and track is closely linked to the track and sleeper is responsible for bearing the weight of the train through the weight of the track and sleeper to prevent the weight of the track and sleeper into the ground, to play a buffer, but also to absorb the vibration and noise produced by the train. Paved with small stones of the railroad track called ballasted track, its advantages are:

1, the rolling stock load through the rails, sleepers and through the bed of the diffusion of the role of the roadbed spread on the roadbed surface, play a role in protecting the roadbed.

2, to provide resistance to the longitudinal and transverse resistance of the rail, to maintain the correct geometric position of the track, which is particularly important for seamless lines.

3, with good drainage performance, to reduce the track of frost damage and improve the bearing capacity of the roadbed is very important.

4, to provide a certain degree of elasticity and damping, play a role in cushioning and shock absorption.

Extended information

Relatively ballasted track, it also has the line plane geometry is not easy to maintain, the use of short life, maintenance and repair workload and other shortcomings. Ballasted track requires frequent maintenance. When the train passes by, it will bring vibration, and the long-term vibration will make the soil on the roadbed mixed into the ballast, so it is necessary to change the ballast and clear the sieve and other maintenance work.

The ballast can't reach the level of whole concrete bed even if it is flat, and because the sleepers are not rigidly fixed on the bed, the rail between the wheels will deform when the train passes by, so the high-speed rail will be easily derailed in the high-speed driving. Ballast splash problem. High-speed rail is fast, and the ballast splash problem will occur when the train passes by at high speed.

Baidu Encyclopedia-Ballasted Track