Abstract
In soft soil areas, such as the Nanjing, it is very important to quantitatively analyze the dynamic behaviors of soft soils during the metro train operation. A nonlinear coupling model of wheel-track and a finite element calculation model of tunnel and soil were established based on the mechanical character of elastic supporting block ballastless track and the actual parameters of Nanjing soft soil. The time-variant vertical acceleration of the rail, the sleepers, and the surface of the tunnel can be calculated by the models, and the frequency dependence acceleration was verified by the fast Fourier transform algorithm. A modified vibration power level for human sensitivity was used to quantify the vibration energy of each part of the system, and the impact of the parameters in the model was evaluated. The results can be applied to the metro design and construction, which also can be the guidance during the tunnel construction.
Highlights
With the continuous development of urbanization, the urban traffic is getting increasingly crowded
Lopes et al [6] focused on the experimental validation of a numerical approach previously proposed for the prediction of vibrations inside buildings due to railway traffic in tunnels. ree autonomous models compose the numerical model in order to simulate the generation, propagation, and reception of vibrations
Research that focused on the propagation of vibration caused from the wheel-rail exceeding in the soil has been developed many years in the world. e models, which used to solve the problem of vibration wave propagation in the soil caused by metro operation, can be classified into two categories: the finite element models (FEMs) and analytical method
Summary
With the continuous development of urbanization, the urban traffic is getting increasingly crowded. E research studies, which include metro vehicle and track coupling system and vibration energy transform in the soil, usually consist of two independent sections. E models, which used to solve the problem of vibration wave propagation in the soil caused by metro operation, can be classified into two categories: the finite element models (FEMs) and analytical method. E research of the subway system mostly focused on the vibration damping track, and the vehicle-wheel coupling system was established; the effect on the environment by subway vibration was discussed through field measurement and data fitting during the metro operation. Analyzing each parameter’s influences, which focused on system vibration energy causing and spreading, is important through establishing a vehicle-rail-sleeperballast-lining-soil body model. 2. Vehicle-Track Coupling Model e settlement of the soft soil surrounding along metro lines is caused by the long-term cyclic loading during the metro operation.
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