地铁环境振动预测中源强位置的选取至关重要.通过对北京市铺设不同减振措施的地铁线路的实地测试分析,计算各测点一天内200多列车的振级并对其进行频次统计分析,比较各测点的振级波动范围.研究结果表明:在北京市地铁环境振动预测中选择隧道壁作为源强可以更好地反映实际振动情况,有助于提高环境振动预测精度；另外,提出一种剔除部分出现概率小且偏离均值较大的离散数值以缩小波动范围的方法,简单实用.%The selection of vibration source position in metro - induced environment vibration forecast is of crucial importance. Through practical test and analysis of Beijing metro lines, in which different vibration reduction measures are taken, the vibration levels of more than 200 trains in one day are calculated, their frequencies are analyzed and compared based on the data of each testing point. The results show that: in the forecast of Beijing metro- induced environment vibration, the selection of tunnel wall vibration as the vibration source position could reflect the actual vibration and improve the environmental vibration forecast more accurately. In addition, a practical and simple method is proposed to eliminate some data with lower probability of appearance and larger deviation from its mean, thus could minimize the fluctuating range.
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