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为获取隧道内列车荷载的振动特性,对某地铁区间隧道进行了试车试验.分析了扣件类型、列车运行速度等因素对荷载特性的影响;基于隧道断面的实测结果分析了其振动传播规律.结果表明:当地铁列车以60km/h通过时,实测振动源强均值为70.41dB;沿隧道断面的振动幅值逐渐减小,且荷载的高频分量逐渐衰减,钢轨竖向加速度最大,且以100Hz以上的高频分量为主;道床顶面和隧道基底的振动量值接近,且远大于隧道侧壁;随着车速增加,各测点的竖向分频振级逐渐增大,且低频段的振级增加更为显著,但车速的增加并未改变荷载的主频段,且随着车速增加,道床与隧道侧壁之间的振动传递损失增大;扣件类型对荷载的分频振级有较大影响.
In order to obtain the vibration characteristics of the train load in the tunnel, a test run was carried out on a subway tunnel, the influence of the fastener type and the train speed on the load characteristics was analyzed, and the vibration propagation was analyzed based on the measured results of the tunnel section. The results show that when the subway trains pass at 60km / h, the measured average vibration source strength is 70.41dB; the vibration amplitude along the tunnel section decreases gradually, and the high-frequency components of the load gradually decay, and the vertical acceleration of rail is the largest 100Hz above the main high-frequency components; the top of the tunnel bed and the tunnel vibration values close to and much larger than the tunnel sidewall; with the speed increases, the measuring points of the vertical subscales gradually increase, and the low frequency band However, the increase of vehicle speed did not change the main frequency band of load. With the increase of vehicle speed, the vibration transmission loss between track bed and tunnel sidewall increased. Have a greater impact.