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Dynamics of Rail Transit Tunnel Systems develops the dynamic theory of a rail transit tunnel system and provides research methods for the evaluation of long-term settlement of rail transit tunnels in soft soil, the service performance of tunnel structures, and the characterization of environmental vibration induced by trains. In recent years, a large number of rail transit tunnels have been constructed and put into operation, particularly in China. To evaluate the time-dependent degradation of tunnel structures and train-induced environmental vibration, a reliable model must be established to determine the dynamic response of a vehicle-track-tunnel-soil system, hence the introduction of this timely resource.Provides full theoretical background to help the reader gain an in-depth understanding of the various methods used for dynamic analysis of a rail transit tunnel systemDevelops the dynamics theory and method of a rail transit tunnel system under the context of challenging engineering problemsPresents methods for analyzing the dynamic responses of rail transit tunnel-soil systemsLooks at problems that need to be solved in the future and proposes potential directions for future research

Dynamics of Rail Transit Tunnel Systems develops the dynamic theory of a rail transit tunnel system and provides research methods for the evaluation of long-term settlement of rail transit tunnels in soft soil, the service performance of tunnel structures, and the characterization of environmental vibration induced by trains. In recent years, a large number of rail transit tunnels have been constructed and put into operation, particularly in China. To evaluate the time-dependent degradation of tunnel structures and train-induced environmental vibration, a reliable model must be established to determine the dynamic response of a vehicle-track-tunnel-soil system, hence the introduction of this timely resource.Provides full theoretical background to help the reader gain an in-depth understanding of the various methods used for dynamic analysis of a rail transit tunnel systemDevelops the dynamics theory and method of a rail transit tunnel system under the context of challenging engineering problemsPresents methods for analyzing the dynamic responses of rail transit tunnel-soil systemsLooks at problems that need to be solved in the future and proposes potential directions for future research

Dynamics of Rail Transit Tunnel Systems develops the dynamic theory of a rail transit tunnel system and provides research methods for the evaluation of long-term settlement of rail transit tunnels in soft soil, the service performance of tunnel structures, and the characterization of environmental vibration induced by trains. In recent years, a large number of rail transit tunnels have been constructed and put into operation, particularly in China. To evaluate the time-dependent degradation of tunnel structures and train-induced environmental vibration, a reliable model must be established to determine the dynamic response of a vehicle-track-tunnel-soil system, hence the introduction of this timely resource.Provides full theoretical background to help the reader gain an in-depth understanding of the various methods used for dynamic analysis of a rail transit tunnel systemDevelops the dynamics theory and method of a rail transit tunnel system under the context of challenging engineering problemsPresents methods for analyzing the dynamic responses of rail transit tunnel-soil systemsLooks at problems that need to be solved in the future and proposes potential directions for future research

The floating-slab track is one of the best methods to reduce the vibration from the underground railway. In this paper, the rubber floating-slab track was studied. The train-track model coupled with the track-tunnel-surrounding soil model was built, which was verified by the results of the in-site test. Through this model, the quality of the rubber floating-slab track was optimized by the multi-island genetic algorithm. The optimized Z vibration level was reduced by 4.92 dB with the density of the floating slab 2306 kg/m3, the Young’s modulus of the floating slab 3.21×1010 N/m2, the density of the rubber bearing 730 kg/m3 and the Young’s modulus of the rubber bearing 9.55×108 N/m2.

The rubber floating-slab track is one of the best methods to isolate vibration induced by the interaction of the train and the rails. In order to improve its vibration reduction ability, three kinds of supporting forms, i.e. full-surface supporting, linear supporting and point-like supporting, were discussed by laboratory tests. Through time history analysis and frequency spectrum analysis, we found that the linear supporting form and the point-like supporting form have the smaller first resonant frequency than the full-surface supporting form, which is induced by the weakened supporting stiffness. Because of this reason, the maximum values of vibration acceleration of the floating slab for the linear supporting form and the point-like supporting form increase in the time domain and the frequency domain. However, the point-like supporting form has the smallest transfer ratio of vibration acceleration from the floating slab to the tunnel wall compared with the linear supporting form and the full-surface supporting form.