Research on environmental impact assessment of urban rail transit track roughness on vibration source intensity

In order to study the vibration environmental impact of the unevenness of urban rail transit, by applying the vehicle-track space coupling dynamics model and the track-tunnel-soil three-dimensional finite element-infinite element coupling model, and verified with the measured data of vibration source intensity, the speed correction coefficients under the train speed of 100-120 km/h and different track irregularity spectrum conditions was obtained. When the track conditions were severe, the recommended value of correction coefficient of vibration environment influence speed was 36.2; when the track conditions were normal, the recommended value of correction coefficient of vibration environment influence speed was 31.0; when the track conditions were good, the recommended value of correction coefficient of vibration environment influence speed was 23.3. This research could provide a reference and basis for the evaluation of urban rail transit vibration environmental impact and vibration reduction design.