Abstract
The frequently moving subway trains often cause large vibration of the rack buildings especially tall buildings and noise problem, which lead to the discomfort of the occupants. Therefore, it is highly necessary to adopt measures to decrease the vibrations. The finite element model of vehicle-rail-foundation was established by using ABAQUS program, and vibration mitigation ability by using ballast mats was investigated. The results showed that the ballast mat has ability to mitigate train-induced environmental vibrations. The acceleration level can be highly reduced within 30 m from the track centerline on the ground. Increasing the thickness of the ballast mat and increasing the static foundation modulus can enhance the vibration mitigation effect. The research results can provide references for the train-induced environmental vibration mitigation design.
Highlights
Ballast mat is made of natural and synthetic rubber, which can mitigate vibration and even achieve the effect of preventing the propagation of vibration
Within 30 m from the track centerline, ground vibration and building vibration have exceeded the limit of relevant vibration standards
The ground vibration can be reduced by about 10 dB within 30 m from the center line of the track, and the attenuation of vibration decreases with the increase of the distance from the center line of track
Summary
Ballast mat is made of natural and synthetic rubber, which can mitigate vibration and even achieve the effect of preventing the propagation of vibration. It can adjust the rigidity of the track superstructure and prevent excessive wear of the ballast [1]. The ballasted track often suffers from diseases such as rapid ballast pulverization, whitening of the ballast bed, serious compaction, and “liquefaction” of the ballast due to insufficient thickness of the ballast bed These diseases greatly increase the workload of track maintenance and repair, and make the environmental friendliness of rail transportation greatly reduced.
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