滨海软土地区地铁运营对沿线建筑物振动影响分析
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摘要
滨海新区新建地铁Z2线运行最高时速可达120 km,大于城市中运行的普通地铁列车时速(60～80 km),高速地铁荷载相较于普通列车荷载有着频率高、幅值大的特点,所造成的环境振动也有所不同。本研究以天津市Z2地铁线一期工程作为实例,依托实际工程数据,利用大型通用有限元软件ABAQUS,建立轨道–隧道–地基–建筑物三维有限元模型,并结合ABAQUS自带子程序DLOAD模拟移动荷载,利用动力隐式分析针对天津滨海新区饱和软土地带快速地铁运营对沿线构建筑物的振动影响进行分析。并且对比3种基础形式–桩基础、筏板基础与条形基础的建筑结构在不同列车速度和隧道埋深工况下的振动反应规律。研究结论可为今后地铁工程沿线振动预测和评估提供指导。
The maximum running speed of the newly built Z2 metro line in Tianjin Binhai New Area can reach 120 km/h,which is higher than that of the ordinary metro train running in the cities(about 60～80 km/h). Compared with the ordinary train load, the load of high-speed metro has the characteristics of high frequency and large amplitude, and the environmental vibration caused by it is also different. Taking the first phase of Tianjin Z2 metro line project as an example and based on the actual engineering data, by using the large-scale general finite element software ABAQUS, the three-dimensional finite element model for rail track-tunnel-foundation-building is established, and the moving loads are simulated with ABAQUS self-contained subroutine DLOAD. The influences of rapid metro operation in Tianjin Binhai New Area in soft soil areas on the vibration of buildings along the line are analyzed using the dynamic implicit analysis. At the same time, the vibration response laws of three kinds of foundation structures of pile foundation, raft foundation and strip foundation under different train speeds and tunnel buried depth conditions are compared. The conclusions can provide guidance for the prediction and evaluation of vibration along metro lines in the future.
The maximum running speed of the newly built Z2 metro line in Tianjin Binhai New Area can reach 120 km/h,which is higher than that of the ordinary metro train running in the cities(about 60～80 km/h). Compared with the ordinary train load, the load of high-speed metro has the characteristics of high frequency and large amplitude, and the environmental vibration caused by it is also different. Taking the first phase of Tianjin Z2 metro line project as an example and based on the actual engineering data, by using the large-scale general finite element software ABAQUS, the three-dimensional finite element model for rail track-tunnel-foundation-building is established, and the moving loads are simulated with ABAQUS self-contained subroutine DLOAD. The influences of rapid metro operation in Tianjin Binhai New Area in soft soil areas on the vibration of buildings along the line are analyzed using the dynamic implicit analysis. At the same time, the vibration response laws of three kinds of foundation structures of pile foundation, raft foundation and strip foundation under different train speeds and tunnel buried depth conditions are compared. The conclusions can provide guidance for the prediction and evaluation of vibration along metro lines in the future.
引文
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[2]DAWN T M,STANWORTH C G.Ground vibrations from passing trains[J].Journal of Sound and Vibration,1979,66(3):355-359.
[3]王星星.地铁振动对沿线环境影响的预测[J].噪声与振动控制,1993(5):22-24.(WANG Xing-xing.Prediction of the environmental impact of metro vibration along the line[J].Noise and Vibration Control,1993(5):22-24.(in Chinese))
[4]潘昌实,刘维宁.隧道列车振动试验与动态分析[J].兰州铁道学院学报,1985,4(2):1-21.(PAN Chang-shi,LIUWei-ning.Vibration test and dynamic analysis of tunnel trains[J].Journal of Lanzhou Railway University,1985,4(2):1-21.(in Chinese))
[5]周立.地体列车运行诱发环境振动的数值模拟与烦恼率评价[D].南京:南京大学,2015.(ZHOU Li.Numerical simulation and annoyance rate evaluation of environmental vibration induced by terrain train operation[D].Nanjing:Nanjing University,2015.(in Chinese))
[6]梁波,蔡英.不平顺条件下高速铁路路基的动力分析[J].铁道学报,1999,21(2):84-88.(LIANG Bo,CAI Ying.Dynamic analysis of high-speed railway subgrade under irregular conditions[J].Journal of Railway,1999,21(2):84-88.(in Chinese))
[7]胡宗允,李晶晶.地铁列车荷载分析方法[J].路基工程,2006(5):18-20.(HU Zong-yun,LI Jing-jing.Metro train load analysis method[J].Subgrade Engineering,2006(5):18-20.(in Chinese))
[8]YANG Y B,HUNG H H,HONG X.Wave propagation for train-induced vibrations:a finite/infinite element approach[M].Singapore:World Scientific Publishing 2009:91-92.