地铁运行振动对邻近民国建筑的影响

Effects of metro operation vibration on neighboring buildings of Republic China

以南京地铁1号线某区段邻近民国建筑为研究对象,现场实测地铁运行通过时引起的地面振动加速度,分析振动响应在时域和频域内的传播规律,并以Z振级为评价指标,评估地铁运行振动对邻近民国建筑的影响。测试结果表明:地铁运行引起的地面振动以竖向为主,振动量随与地铁线路距离增大呈波浪式衰减,在近场区域某一距离处达到最大值,在远场区域逐渐衰减并趋于稳定;地铁运行引发的振动响应主要集中在50～80 Hz,且对应的分频振级衰减较快;地铁附近部分区域Z振级已超过环境控制标准。研究成果对地铁线路邻近民国建筑的保护提供了一定的参考,同时有助于研究地铁运行振动对沿线周边环境的影响。

Taking the buildings of Republic China near the section of Nanjing metro line 1 as the object,the ground vibration acceleration caused by the metro running was measured,and the propagation law of the vibration response in the time domain and the frequency domain was analyzed by taking the Z vibration level as the evaluation index to assess the influence of metro running vibration on neighboring buildings.Results showed that the ground vibration caused by the metro running was mainly in the vertical direction,the amount of vibration was wave attenuation with the increase of the distance from the metro line,reaching the maximum at a certain distance in the near field,and gradually decaying and stabilizing in the far field.The vibration response was mainly concentrated at 50 80 Hz,and the corresponding decaying stage decayed faster.The Z vibration level in some areas near the metro had exceeded the environmental control level.The results provided some reference for the protection of the buildings near the metro line,and were beneficial for studying the influence of metro running vibration on the surrounding environment.