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针对日益密集的轨道交通网络引发的环境振动问题,目前减振措施以轨道减振为主,而传播途径上的减振措施,因施工条件制约,其应用受到局限。由于设置减震层能有效减小隧道动力响应,故文章从结构减振的角度,探讨“围岩-初衬-减振层-二衬”的减振模式,基于荷载-结构法原理,探究泡沫混凝土、沥青、橡胶3种减振材料作为减振层的减振效果。结果表明:加设减振层能有效减小隧道衬砌结构、地层、地面的振动响应,使地面Z振级符合标准限值,泡沫混凝土层对地面振动放大效应衰减幅度最大,达9.5%,对30~80Hz频段的减振效果最明显,在实际工程中可以考虑加设泡沫混凝土层作为有效减振措施。
In view of the environmental vibration caused by the increasingly dense rail transit network, the current vibration reduction measures are based on orbital vibration reduction. However, the vibration reduction measures on the transmission route are limited due to the restriction of construction conditions. Since the damping layer is provided, the dynamic response of the tunnel can be reduced effectively. Therefore, the vibration mode of “surrounding rock - primary lining - damping layer - secondary lining” is discussed from the view of structural vibration reduction. Based on the load-structure principle , To explore the foam concrete, asphalt, rubber three kinds of damping material as a damping layer damping effect. The results show that adding the vibration-damping layer can effectively reduce the vibration response of the tunnel lining structure, ground and ground, and make the Z-vibration level of the ground meet the standard limit. The foam concrete layer attenuates the vibration of the ground to the maximum by 9.5% The damping effect of 30 ~ 80Hz frequency band is the most obvious. In practice, the foam concrete layer may be added as an effective damping measure.