曲线地段地铁振动对邻近建筑的影响分析  

Analysis of the Impact Induced by Vibration of Curved Segment of Subways on Adjacent Buildings

作　　者：张啟乐 刘林芽[1] 李纪阳[1] 

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,南昌330013

出　　处：《噪声与振动控制》2015年第4期115-120,共6页Noise and Vibration Control

基　　金：国家自然基金:(51268014)

摘　　要：以南昌地铁1号线圆曲线(曲率半径为400 m)下穿南昌科技大楼段工程背景为依托,建立轨道—隧道—大地—科技楼三维有限元模型,从数值计算的角度分析地铁列车在曲地段运行时引起的环境振动对邻近建筑的影响。结果表明,曲线段地面的振动强度水平向接近竖向,这与直线地段主要以竖向振动为主的振动状态存在明显的差别;科技楼室内水平向振动强度低于竖向,第1层的振动在20 Hz出现最大值,其它各楼层均在6.3 Hz和16 Hz出现最大值,室内第1—8层竖向振动1/3倍频程均超过标准夜间限值,需要作隔振处理;无论在水平向还是在竖向,列车行驶速度越快,振动响应越大,竖向振动在楼层间的变化幅度要小于水平向,水平向的振动最大值出现在底层或顶层;建筑结构基础形式采用桩基础,增大其产生的阻尼、刚度、附加质量,可以减小地铁环境振动的干扰。Three-dimensional finite element model including rail, tunnel, soil ground and buildings was established for analysis of a curved segment of Nanchang Metro Line 1 with radius of curvature R=400 m, which passes through under the Nanchang Science and Technology Building. The impact induced by the curved segment vibration on adjacent buildings was analyzed. The result shows that the ground horizontal vibration level is close to the ground vertical vibration level in the vicinity of the curved segment. It is quite different from the vibration situation in straight line section where the vibration is mainly in vertical direction. Inside the Science and Technology Building, the horizontal vibration level is lower than the vertical one. In the first floor, vibration magnitude of the ground reaches the maximum at 20 Hz frequency. In the other floors, the maximum vibration magnitudes appear at the frequencies of 6.3 Hz and 16 Hz. The 1/3 octave of vertical vibration of the 1- 8 th floors in the building exceed the standard limit value at night. So, vibration isolation measures are necessary. With the increasing of the speed of the train, the vibration response increases in both horizontal and vertical directions, the magnitude of vibration change in the vertical from 1st floor to 8th floors is less than that of the horizontal vibration change, and the maximum horizontal vibration level appears at the bottom floor or top floor. For the buildings with pile foundation, increasing damping, stiffness and additive mass can reduce the environmental vibration interference induced by the subway.

关 键 词：振动与波 地铁 曲线地段 桩基础 

分 类 号：TB533.2[理学—物理]