1 School of Civil Engineering, Beijing Jiaotong University, Beijing100044, China
2 Energy Saving & Environmental Protection & Occupational Safety and Health Research Institute, China Academy of Railway Sciences, Beijing 100081, China
The vibration isolation effect of the rigid sandwich wall was measured and the characteristics of time and frequency domain at low frequency was analyzed on the basis of the environmental isolation engineering of the railway in the Beijing suburb in this paper. The results indicated that environmental vibration significantly decreased after building the rigid sandwich walls. The vibration isolation efficiency of the rigid sandwich wall is respectively 0.32 and 0.46 at a distance of 35 meters and 40 meters away from railway center. It is obvious that a distance of 5 meters behind the vibration isolation barrier shows a more obvious vibration isolation effect than 10 meters. The vibration isolation barrier has an obvious effect in middle-high frequency (10~80 Hz) of the vibration, especially formed by sleeper spacing action rate (22.7 Hz). In addition, the effect is not obvious with a frequency below 10 Hz, such as the low frequency vibration formed by the moving axle load (7 Hz). In this paper, a vibration model of the earth-rigid sandwich wall was established. It also studied the effect of width, depth and position of the barrier on the vibration isolation, and provided the application condition and the setting requirement of key parameters for the rigid sandwich wall. These results provided the technical support for controlling projects of environmental vibration with rigid sandwich walls.
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