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4.2dB ~7.6dB。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130kN/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。
Abstract
The vibration caused by the operation of underground high-speed railway propagates through the surrounding strata, which will cause the secondary vibration of nearby underground structures and adjacent buildings above ground, thus affecting the surrounding environment and the performance of buildings. Taking a commercial comprehensive building as the background, a three-dimensional finite element analysis model of "tunnel-soil-building floor-superstructure" is established to calculate the structural vibration response of underground high-speed railway.The vibration reduction and isolation effect of vertical vibration isolation bearing is studied according to the vibration control standard. The results show that the vibration of the building near the underground high-speed railway line exceeds the limit without taking vibration reduction measures. The vertical vibration isolation bearing can effectively restrain the vibration response of the building structure. It can reduce the average vibration level of the building floor by 4.2dB ~ 7.6dB with different parameter. Considering the effect of vibration isolation and the vertical deformation, it is suggested that the damping ratio of the vibration isolation bearing should be 0.01 and the vertical stiffness should be 130kN/mm. Finally, the parameter design method of vertical vibration isolation bearing is obtained, which can provide necessary guidance for follow-up engineering application.
关键词
地下高铁 /
全过程 /
振动评估 /
隔振支座 /
减隔振
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Key words
underground high-speed railway /
whole process analysis /
vibration assessment /
vibration isolation support /
vibration reduction
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