西安地铁2号线对古建筑物振动影响监测分析

Monitoring and Analysis of Xi’an Metro Line No.2 Vibration Influence on Historical Buildings

以西安地铁2号线穿越或绕行全国重点文物保护单位为工程实例,通过现场监测获得地铁运营以来隧道内及古建筑物本体振动响应水平,据此对钢弹簧浮置板道床的减振效果进行评价;在地铁运营期与地铁停运期工况下,对古建筑进行振动响应的综合测试。统计分析了九年的长期运营监测数据,结果表明:(1)钢弹簧浮置板道床适用于古建筑等有特殊减振需求的地段;(2)不同工况下古建筑本体振动响应在容许范围内;(3)列车运行速度对综合工况下古建筑的振动响应影响程度有限,研究成果可为地铁运行速度调整方案提供基础资料与技术参考。

This paper presents an engineering case history of constructing Xi’an Metro Line 2 crossing or detouring around the national key cultural relic protection unit.The vibration response levels at the tunnel during the operation and at the historical buildings have been obtained throughout the in-situ monitoring.Based on the monitored vibration data,the effect of vibration reduction of the floating steel spring plate placed underneath the track.The vibration levels of historical buildings under the subway with and without the operating traffic were also evaluated.The nine years of the vibration monitoring data were statistically analyzed and the following results are concluded:1)The floating steel spring plate is suitable for the special vibration reduction need such as rail tracks near the historical buildings;2)the vibration level of the building induced by the operative traffic is within the code tolerable range;3)The speed of the subway train has limited effect on the vibration level of the historical building and these monitoring data provide useful references for the optimize the speed of the subway trains.