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现场观测中发现,行驶中的火车完全进入隧道后,隧道上的山体、内部的地基以及外部地面上的振动都明显减弱了;同时还发现,介于测点和路轨间的山体也会使测点一侧的地面振动减弱。而减弱的程度与隧道的壁厚或中介山体的体积有关。空腔振源的这种屏蔽作用不同于解耦爆炸中地震效应减弱的机理,也不同于一般防振槽的隔振效应,它是波动力学中的一个新问题,也可作为减弱振动噪声的一种手段。
In the field observation, it was found that after the moving train completely entered the tunnel, the vibration on the mountain, the internal foundation and the external ground in the tunnel were significantly weakened. At the same time, it was also found that the mountain between the measuring point and the rail also made the measurement The vibration on the ground on the point side is weakened. The degree of weakening and the tunnel wall thickness or agency mountain size. The shielding effect of hollow cavity vibration source is different from the weakening mechanism of seismic effect in decoupling explosion and also different from the vibration isolation effect of ordinary vibration-proof slot. It is a new problem in wave dynamics and can also be used as a method to reduce vibration noise A means.