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对苏州轨道交通2号线引起的地面振动采用加速度传感器进行实测,研究其传播规律,并通过有限元软件建立了隧道-土层三维模型,模拟了轨道交通所引起的不同距离地面振动响应,并与实测数据进行了对比验证。结果表明:轨道交通在圆曲线段引起的地面水平振动加速度有效值在距离隧道中心线12m以内的范围内是竖向振动加速度有效值的2倍左右,在12m范围以外地面水平和竖向振动加速度有效值大小相当;轨道交通对距离隧道中心线25m以外的地面水平振动加速度已无明显影响,而竖向振动的影响更远;轨道交通在圆曲线段引起地面水平振动的主要频率为30~125Hz。轨道交通引起地面竖向振动的主要频率为40~100Hz。竖直方向在6~12m范围内存在振动放大区,10Hz以下的低频水平方向上的振动在距离隧道中心线12~17m范围内放大,提示地铁周围这一范围内的建筑需要特别关注。
The ground vibration induced by Suzhou Metro Line 2 was measured by accelerometer and the propagation law was studied. The three-dimensional tunnel-soil model was established by finite element software to simulate the ground vibration responses caused by rail transit at different distances. Contrast with the measured data validation. The results show that the effective value of ground horizontal vibration acceleration caused by circular traffic in circular curve section is about 2 times the effective value of vertical vibration acceleration within 12m from the center line of the tunnel. The ground horizontal and vertical vibration acceleration The equivalent value of the effective value; the rail transit has no obvious influence on the ground horizontal vibration acceleration 25m away from the center line of the tunnel, but the vertical vibration has a far more influence; the main frequency of rail horizontal vibration caused by the circular curve is 30 ~ 125Hz . The main frequency of ground vibration caused by rail transit is 40 ~ 100Hz. Vibration amplifying area exists in the vertical direction in the range of 6 ~ 12m. The vibration in the low frequency horizontal direction below 10Hz is amplified in the range of 12 ~ 17m from the tunnel centerline, which indicates that special attention should be paid to the buildings in the area around the subway.