Abstract
Running metro trains would inevitably influence the vibration deformation in the lower part of the roadbed structure. In order to study the effects of vibration, Qingdao metro line 3 tunnel was taken as the research background. The track coupling model was established using Abaqus-Simpack to analyze the train velocity, train axle load, and trackbed vibration forms for the vertical deformation of roadbed calendar effect to provide the reference in practical engineering design and deformation control. According to the analysis, influenced by the formation of Qingdao Metro Line 3, the time-history curve of the displacement excitation of the trackbed presents the distribution law of “large in the middle and small at both ends.” According to the sensitivity analysis, the deformation of the trackbed is most obviously affected by the form of trackbed; the second was the influence of the axle load of the train. The speed change of the subway train presented relatively little influence on the displacement of the trackbed. Although the deformation control ability of the integral trackbed was better, its vibration reduction performance was poor. The vibration reduction performance of the rubber cushion floating trackbed was the best, followed by the steel spring floating trackbed.
Highlights
With the development of transportation, the vibration influence of rail train operation on the surrounding environment cannot be ignored
Many scholars have done a lot of research on this issue. He and Cui [1] used numerical simulation to research the difference of vibration law between train operation and frozen soil and undisturbed soil
Yaseri et al [3], Gao et al [4], Zhu et al [5], and Nejati et al [6] researched the law of the influence of train operation on ground vibration using numerical simulation
Summary
With the development of transportation, the vibration influence of rail train operation on the surrounding environment cannot be ignored. Liu et al [18] and Han et al [19, 20] established a three-dimensional finite element model and used dynamic implicit analysis to analyze the variation rule of ground vibration intensity under different shield tunnel burial depths, different elastic modulus of tunnel foundation, different subway train speeds, and different soil properties of tunnels. Xie et al [21] and Liang et al [22] established a two-dimensional finite element dynamic analysis model and studied the vibration response law of subway operation on adjacent sensitive buildings and the influence of foundation form on vibration by taking speed as the control physical quantity. Schillemans et al calculated the trainload through the measured transfer function and established a two-dimensional finite element model to study the impact of environmental vibration caused by high-speed railway train operation and analyze the vibration reduction effect of vibration reduction type floating slab track. AbaqusSimpack was used to establish the rigid and flexible coupling numerical model of rail to analyze the law of track vibration deformation under the conditions of train running speed, train axle load, and different modes of trackbed vibration reduction
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