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针对西安地铁振动对钟楼影响案例,建立了“车辆-轨道-隧道-土层”3维动力有限元模型,研究了行车速度对3个方向地表振动响应的影响:结果显示,降低车速对控制地表速度峰值效果显著。地铁2号线通车后,首次针对重点古建筑防地铁交通微振动控制问题采用“输入-输出”两位置进行模型校准,测试结果显示,模型输入激励与输出响应均与实测结果吻合良好。校核后的模型用于预测地铁2号线、6号线联合运行下振动响应。比较了拟建6号线3种不同线位,当考虑钟楼微振动控制时,方案2和方案3要优于方案1。
Aiming at the influence of Xi’an metro vibration on the clock tower, a 3-D dynamic finite element model of “vehicle-track-tunnel-soil layer” was established and the effect of driving speed on the vibration responses of the three directions was studied. Control of surface velocity peak effect is significant. After the opening of Metro Line 2, the model is calibrated with the “Input-Output” two positions for the key anti-metro traffic micro-vibration control of the key ancient buildings. The test results show that the model input excitation and output response are in good agreement with the measured results. The calibrated model is used to predict the vibration response of Metro Line 2 and Line 6 combined operation. Compared with the proposed three different lines of line 6, when considering the vibration control of the clock tower, solutions 2 and 3 are superior to solution 1.