摘要
研究目的:成都博物馆紧邻地铁2号线,如果减振措施采取不当,地铁所致振动极有可能对博物馆正常使用产生影响。同时,为满足地铁通行条件下成都博物馆内文物振动安全的要求,结合实测数据,采用有限元软件MIDAS/GTS建立"浮置板-隧道-土体"三维有限元模型,选取隧道壁的竖向振动为控制参量,对浮置板、钢弹簧刚度和隧道壁厚度的减振效果进行量化分析和参数优化研究。研究结论:(1)浮置板具有阻碍高频、放大低频的减振特性,当其钢弹簧刚度为6 900 kN/m时,其综合减振效果达12.1 dB;(2)降低钢弹簧刚度可以有效降低隧道壁Z振级,弹簧刚度由9 000 kN/m降低到3 000 kN/m时,隧道壁Z振级降低了5.6 dB;(3)增加隧道壁厚度可以降低隧道壁Z振级,当隧道壁厚度由0.2 m增加到0.8 m时,隧道壁Z振级降低了2.7 dB,减振效果不明显;(4)该研究成果可为地铁所致振动的振源减震提供参考。
Research purposes： Chengdu Museum is close to metro line 2, so if the vibration reduction measures are not taken properly, the vibration induced by metro will adversely affect the normal use of the museum. Meanwhile, in order to meet the requirements of museum relics safety under metro vibration, based on the measured data, a three - dimensional finite element model of floating slab - tunnel - soil in MADIS/GTS is established. The tunnel wall vertical vibration is selected as a reference to measure the vibration attenuation effect of floating slab, the stiffness of steel spring and the thickness of tunnel wall. Research conclusions： （ 1 ） The floating slab could decrease vibration in high frequency band and increase vibration in low frequency band. When the stiffness of the steel spring is 6 900 kN/m, its comprehensive vibration attenuation effect is 12.1 dB. （2） Reducing the stiffness of steel spring could effectively reduce the Z direction vibration of tunnel wall. When the stiffness of the steel spring is reduced from 9 000 kN/m to 3 000 kN/m, the Z direction vibration of tunnel wall is reduced by 5.6 dB. （3） Increasing the thickness of the tunnel wall could reduce the Z direction vibration of tunnel wall. When the thickness of the tunnel wall increase from 0.2 m to 0.8 m, the Z direction vibration of tunnel wall could reduce 2.7 dB, the effect is not obvious. （4） The research result can be applied on the source reduction of vibration induced by metro running.
出处
《铁道工程学报》
EI
北大核心
2016年第1期102-108,共7页
Journal of Railway Engineering Society
基金
国家自然科学基金资助项目(51178041
51578046)
中国航空规划建设发展有限公司资助项目(技12技-1)
关键词
地铁振动
振源
减振
钢弹簧浮置板
隧道壁
metro vibration
vibration source
vibration attenuation
steel spring floating slab
tunnel wall
