Abstract
A two-step approach is used to establish a numerical prediction model to study the impact of typical rail corrugation on ground vibration from an underground subway. In the first step, a vehicle-track-tunnel rigid-flexible coupling subsystem is established based on a lumped mass model dynamics and finite element analysis cosimulation method to simulate the generation of vibration. In the second step, a track-tunnel-soil three-dimensional (3D) finite element subsystem is built to simulate the propagation of the vibration. The ground vibration response is obtained by applying the wheel-rail force calculated from the first step. A section of Chengdu Metro Line 3 is studied, and the accuracy of the numerical prediction model is then verified by comparison with in-situ measurement. Based on that, the impact of corrugation on wheel-rail interaction and ground vibration is investigated by taking rail corrugation in typical subway sections and track geometry irregularities as system input excitation. In addition, to further analyze the sensitivity between different wavelength components in the rail corrugation samples and ground vibration, the measured rail corrugation is decomposed into five kinds with different wavelength components by filtering. The results show that the typical rail corrugation has a large impact on ground vibration response, which increases significantly in the range 8–16 Hz and 50–80 Hz, and the impact decreases with the distance from the vibration source. For typical subway rail corrugation with the significant wavelength of 125 mm and the secondary significant wavelength of 63 mm, the ground vibration response is sensitive to two wavelength components at 40–60 mm and 60–100 mm. Rail corrugation with the short wavelength of 60–100 mm significantly affects ground vibration levels.
Highlights
Rail transit has developed rapidly in recent years. e construction of urban rail transit, especially subways, helps alleviate pressure on urban traffic, improving urban air quality and facilitating the life and travel of urban residents
According to the above analysis, the impact of rail corrugation on ground vibration is mainly caused by two wavelength components, that is, rail corrugation with the wavelength of 40–60 mm and 60–100 mm, respectively, of which that with the wavelength 60–100 mm has a greater impact. e specific reason may be divided into the following two aspects
Erefore, it is suggested that the rail corrugation limit of underground railways should take into account the impact of ground vibration since the ground vibration response is most sensitive to the rail corrugation with the wavelength component of 60–100 mm for typical rail corrugation and strictly control the wave depths of rail corrugation with a short wavelength of 60–100 mm, so as to avoid severe ground vibration
Summary
Rail transit has developed rapidly in recent years. e construction of urban rail transit, especially subways, helps alleviate pressure on urban traffic, improving urban air quality and facilitating the life and travel of urban residents. Few have used short-wavelength rail corrugation to study the dynamic characteristics of the train-track-tunnel-soil coupling system to analyze ground vibration that may be caused by rail corrugation excitation. A numerical model for predicting ground vibration from underground railways is established, and the impact of rail corrugation on environmental response is evaluated. When analyzing wheel-rail coupling dynamics, the numerical model of track slab and tunnel is usually established based on finite element theory and mode superposition method, which can improve calculation efficiency and ensure calculation accuracy, but can simulate the coupling effect of threedimensional spatial vibration response of track slab and tunnel. Where a refers to the mean square root of weighted acceleration, and a0 refers to the reference acceleration, which is usually 10−6 m/s2
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