Study on Vibration Isolation Effect of Periodic Pile Arrangement on Subway Ground

Abstract

For the environmental vibration caused by urban rail transit, this paper proposed a new type of periodic vibration isolation pile as the path vibration isolation measure. The finite element model is used to analyze the vibration damping performance of the periodic pile under the impact of the subway ground source. The measured vibration source strength is used as the excitation input to study the effects of different buried depths and different numbers of rows on the damping effect of the piles. The calculation results show that under the impact of the subway vibration source, the maximum Z-magnitude of the free-field vibration increases exponentially with the increase of the distance; the optimal arrangement of the periodic vibration isolation piles is: pile length: 14 m, number of rows: 3 and arranged close to the vibration source; the vibration damping effect is more than 5 dB within 15 m behind the pile.