Abstract: 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.

Key words: Traffic Induced Vibration, Mitigation Measures, Vibration Monitoring, Control Standards