Abstract
A new train-induced vibration isolation measure of rubber-concrete alternating superposition in-filled trench is presented in this paper. For analyzing the vibration isolation effect of the new measure, this paper establishes a 2.5D train-track-layered foundation-filled trench model to analyze the dynamics of track and layered foundation with the in-filled trench. The correctness of the model is verified by using the measured data of the Sweden X-2000 high-speed train. The vibration isolation effect of the rubber-concrete alternating superposition in-filled trench is calculated by using the actual soft soil foundation parameters of the X-2000 high-speed train, and the vibration isolation effect is also compared with that of the empty trench, rubber in-filled trench, and concrete in-filled trench. The results show that the vibration isolation effect of the rubber-concrete alternating superposition in-filled trench proposed in this paper is better than that of the C30 concrete in-filled trench, especially the impact on displacement. Compared with low-frequency vibrations generated by the lower train speed, the rubber-concrete alternating superposition in-filled trench has a better vibration isolation effect on high-frequency vibrations caused by higher-speed trains. The rubber-concrete alternately superposition in-filled trench has the frequency band characteristics of elastic waves. Elastic waves in the passband frequency range can propagate without attenuation, while the elastic waves in the forbidden frequency range will be filtered out.
Highlights
With the large-scale construction of rail transit, the environmental vibration induced by train operation has attracted more and more attention
To better demonstrate the superiority of the rubber-concrete alternating superposition in-filled trench for train-induced vibration isolation, this paper takes the vibration generated by the Sweden X2000 high-speed train on the actual soft soil foundation as an example, and compares the vibration isolation effect with that of the empty trench, rubber in-filled trench, and C30 concrete in-filled trench
Compared with low-frequency vibrations generated by the lower train speed, the rubber-concrete alternating superposition in-filled trench has a better vibration isolation effect on high-frequency vibrations caused by higher-speed trains
Summary
With the large-scale construction of rail transit, the environmental vibration induced by train operation has attracted more and more attention. The free wave field is defined as the dynamic response (displacement and stress) of a layered half-space without an in-filled trench under a moving load, which is solved by the direct stiffness method. Represents the dynamic response caused by the moving uniform distributed line load; the superscripts “D” and “S”, respectively, represent the layered elastic half-space outside the in-filled trench and the elastic soil layer inside the in-filled trench. Gw(0, 0, 0, ω) is the dynamic flexibility of the layered foundation with an in-filled trench under the action of the moving load in the z-direction It expresses the vertical displacement of the midpoint of the element due to the uniform distributed vertical load acting on the element, which can be obtained by Eq 13. The displacement, velocity, and acceleration responses of any position of the elastic foundation in the time-space domain are obtained from Eq 14
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