车致振动在盖挖逆作法施工地下结构中的传播规律研究

Propagation Characteristic of Vehicle-induced Vibration in Underground Structures Being Constructed by Cover and Excavation Up-down Method

以某铁路车站站场下地下结构盖挖逆作法施工为工程背景,首先现场测试分析了城际铁路列车通过时地下结构的振动响应,其后建立了动车组-轨道结构-地下结构系统耦合动力分析模型,仿真分析了城际铁路列车通过地下结构的全过程,系统探讨了地下结构的车致振动响应及其空间传播规律,揭示了地下结构车致振动机理。研究结果表明,地下结构车致振动随着与运营线路的距离加大而逐渐衰减,且衰减速度逐渐减小;结构动力响应随列车运行时速的提高而增大。

Based on the underground structure being constructed by cover and excavation up-down method under a railway station yard, the vibration response of the underground structures was tested when intercity train was operating. The dynamic analysis model of EMU-track structure-underground structures coupled system is set up. The structure vibration response and propagation characteristic of vehicle-induced vibration are analysed systematically while intercity train running on the underground structures by means of the theories of random vibration. The mechanism of vehicle-induced vibration of underground structures is revealed. The results of the study indicated that the vehicle-induced vibration response of underground structures and the decay rate are getting weaker gradually with increasing distance from railway line. The structural dynamic response increases with increased train speed.