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The environmental vibration induced by freight rail transport has become an important type of environmental pollution. The environmental vibration caused by a running freight train near a typical medium- to low- speed railway in China and in the surrounding residential area is measured and analyzed. The test result shows that in the region adjacent to the railway, the weighed vibration acceleration level as a function of time (t) in the vertical direction (VLz) is lower than 80 dB, which meets the requirements of the standard (GB10070-88); however, in the surrounding residential area, the VLz is in the range of 58-74 dB, which is 0-4 dB higher than the specified limit during the day and 0-2 dB higher than the specified limit at night. For the isolation of environmental vibration induced by the freight train, a dynamic model of the vehicle and track and a finite element model of the railway, stratum and building are constructed to analyze the feasibility of modifying the slope protection piles outside of the building to make them function as vibration isolating piles, and the vibration isolation effects of such piles in a single row and double rows are compared with the case without piles. The simulation result shows that vibration isolation piles can attenuate the vibration level in front of and behind the piles: compared with the case without piles, the VLz can be reduced by 2-4 dB within 5 m behind the piles in a single row, and can be reduced by 4-10dB behind the piles in double rows, so the double-row setup is recommended for vibration isolation. It is suggested that for residential buildings which are close to the existing medium- to low- speed freight railway lines and for which other vibration attenuation measures are impractical, satisfactory vibration isolation effects may be achieved by simply increasing the number of rows of slope protection piles.

journal of vibroengineering

Medium-to-low-speed freight rail transport induced environmental vibration and analysis of the vibration isolation effect of building slope protection piles