地下高铁致结构振动全过程分析及隔振支座减隔振性能研究

地下高铁运行引起的振动通过周围地层传播会导致附近地下结构以及地上邻近建筑的二次振动,从而影响周边环境及建筑物的使用性能。以某商业综合建筑为背景,结合相关参数及现场实测数据建立"隧道—土体—建筑底板—上部结构"全过程三维有限元分析模型,计算地下高铁运行时结构振动响应。结合振动控制标准进行评估,并针对竖向隔振支座的减隔振效果进行研究。结果表明:在未采取减隔振措施的情况下临近地下高铁线路的综合商业建筑振动超限。设置竖向隔振支座能够有效抑制建筑结构的振动响应,不同参数的竖向隔振支座能够使建筑物楼板处的平均振级降低约4.2～7.6 dB。综合考虑减隔振效果及支座竖向变形,建议隔振支座阻尼比取值为0.01,竖向刚度取值为130 kN/mm。最后,得出竖向隔振支座参数取值设计方法,该设计方法可为后续工程应用提供必要的指导依据。

Analysis of whole process of structural vibration induced by underground high-speed train and performance of vibration isolation support

Vibration caused by operation of underground high-speed train propagates through surrounding stratum to lead to the secondary vibration of nearby underground structures and adjacent buildings on the ground,and affect surrounding environment and service performance of buildings.Here,taking a certain commercial complex building as the background,combining with relevant parameters and onsite measured data,a 3-D finite element dynamic analysis model for the“tunnel-soil-baseplate-superstructure”system was established to calculate structural vibration response during operation of underground high-speed train.Combining with the vibration control standard,the vibration reduction and isolation effect of the vertical vibration isolation support was studied.The results showed that the vibration of the commercial complex building near the tunnel exceeds the limit without taking vibration reduction and isolation measures;setting vertical vibration isolation support can effectively suppress vibration responses of the building structure,vertical vibration isolation support with different parameters can reduce the average vibration level of the building floorplate by about 4.2-7.6 dB;comprehensively considering the vibration reduction and isolation effect and the vertical deformation of the support,the recommended value of damping ratio for the vibration isolation support is 0.01 and the support vertical stiffness is taken as 130 kN/mm;finally,the design method for parameters of vertical vibration isolation support is deduced to provide a necessary guidance for subsequent engineering applications.