Taking the underground structure of the West Shanghai Railway Station being constructed by cover and excavation up-dow n method when intercity trains operate as an engineering bachground,EM U-track-under-ground structural system coupled vibration analysis model was set up,to consider synthetically the influence of underground structure construction by cover and excavation up-down method on the track irregularity and to analyze systematically the train operation performance and structural dynamic response during the construction of the underground structure .The operating performance of intercity trains during the construction of the un-derground structure was estimated .The effect of construction status and overburden thickness over the roof of underground structure on the structural vibration performance was investigated .The results of the study indi-cated that the results of the model analysis and the field test were consistent basically .The construction of un-derground structures by cover and excavation up-down method can ensure the safe and stable operation of inter-city trains .The train speed may not be limited during the construction of underground structures under the pre-condition of increased monitoring of the status of railway lines and track maintenance over the underground structure .The vehicle-induced vibration response of underground structures will be reduced with the increase of overburden thickness .%本文以上海西站城际铁路运营条件下地下结构盖挖逆作法施工为工程背景,建立动车组-轨道结构-地下结构系统耦合振动分析模型,综合考虑地下结构盖挖逆作法施工对轨面不平顺的影响,系统分析地下结构施工时列车运营性能和结构动力响应,评判施工期间城际列车的走行性,探讨施工状态及顶板上覆土层厚度对结构振动性能的影响.研究结果表明 :模型分析结果与现场实测基本吻合;地下结构盖挖逆作法施工能够保证城际列车安全平稳运行,在加强施工期间地下结构上方线路状态监测和轨道养护的前提下,运营列车可以不限速;地下结构车致振动响应随覆土厚度增大而减小.
展开▼
