Abstract
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.
Highlights
In recent years, with the further development of high speed and heavy load railway, the negative impact of environmental vibration has become prominent increasingly
In order to study the vibration isolation effect of the rigid sandwich wall at different frequencies, the acceleration response of 29 m, 35 m and 40 m apart from the railway is analyzed by 1/3 double frequency, 1/3 frequency doubling spectrum is shown in Fig. (5)
When the frequency is in the range of 8~80 Hz, the vibration isolation effect of the sandwich wall begins to appear and shows a trend of increasing with the increase of frequency
Summary
With the further development of high speed and heavy load railway, the negative impact of environmental vibration has become prominent increasingly. When the vibration attenuation measures still can’t meet the requirements, or environmental vibration exceeds the standard on the existing railway without reconstruction and expansion, setting the vibration isolation barrier on the vibration propagation path is one of the effective measures. The domestic and foreign scholars mainly study the railway vibration isolation ditch (wall) in theory. The vibration isolation effect of rigid sandwich wall under typical conditions was measured through the field test of the ring railway in the Beijing eastern suburb. The research results provide the technical support for the engineering of railway environmental vibration with rigid sandwich wall
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