Abstract
The metro tunnel lines built in a soft soil area may suffer from tunnel differential settlement due to the high compressibility of soft soil, the engineering constructions nearby tunnel lines, and the cyclic load of metro trains. In this paper, a dynamic coupling model for a metro train-monolithic bed track system under tunnel differential settlement is established. A cosine function is introduced to simulate a real settlement curve measured from a metro tunnel in southern China, and the vibration performance of the train-track system under tunnel settlements is investigated in both the time domain and frequency domain. Based on the standards for the train safety and passengers’ comfort, the speed limit for the metro train traveling on a monolithic bed track with different settlement distributions are concluded. The present research could be useful for the operation and maintenance of metro tunnels in soft soil areas.
Highlights
In recent years, the urban rail transit systems have been developed rapidly, especially in cities with high population density. e metro tunnels are important parts of the urban rail transit system, which can greatly alleviate urban traffic pressure and promote public transportation [1]
A simple numerical example for a metro trainmonolithic bed track system without tunnel settlement is studied to validate the numerical methods proposed in this paper. e vibration responses of the metro train-track system are calculated and compared with those obtained by Wei et al [19]
The vibration responses of the metro trainmonolithic bed track system under tunnel differential settlement are analyzed based on a two-dimensional dynamic model. e effects of a practical tunnel differential settlement on the dynamic responses of the train-track system are studied
Summary
The urban rail transit systems have been developed rapidly, especially in cities with high population density. e metro tunnels are important parts of the urban rail transit system, which can greatly alleviate urban traffic pressure and promote public transportation [1]. E differential settlement of tunnels may lead to the deformation of the metro track, which can aggravate the train-track vibration and cause the damage of tunnel structures. E differences between the 2D and 3D soil-water coupling analyses were studied, and the tunnel settlement was predicted by the 2D model. A dynamic coupling model is established for a metro train-monolithic bed track system. A differential settlement curve measured from a metro tunnel in southern China is considered, and the effect of tunnel differential settlement on the dynamic performance of train-monolithic bed track system is studied. According to the standards of the train safety and passengers’ comfort, the speed limits for a metro train traveling on monolithic bed track under tunnel differential settlement are suggested
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