研究成果

A combination strategy of hollow-closed-wall in-filled trench and elastic bearing for reducing environmental vibration induced by high-speed train

发布时间:2021/2/2阅读次数:425次

Authors: Wei Guo , Zhenyu Bai , Xiaobo Wang , Hanyun Liu , Dan Bu , Zhen Guo , Wenqi Hou , Zhiwu Yu

Abstract:With  the  rapid  development  of  high-speed  railway  (HSR)  in China,  the  problem  of  environmental  vibration induced by HSR  train has  attracted  critical  concern.  In  this paper,  a  combination  vibration  reduction  (CVR)
strategy of hollow-closed-wall  in-filled  trench (HIT) and elastic bearing (EB)  is proposed to decrease environ-mental vibration induced by HSR train, in which the depth of HIT could be well controlled to benefit the practical construction and economic cost. Based on  the multi-body dynamics and finite element  theory, HSR environ-mental vibration system is established and then divided into two sub-models including the ‘train-track-bridge’ vibration  source  sub-model and the  ‘pile-soil’  vibration propagation  sub-model. The  two  sub-models are con-nected via the force balance condition of the pier bottom. The verification of numerical models is conducted by comparing with  the  empirical  formula  and  the  ground  data  in  the  references.  Then  the  attenuation  law  of environmental vibration  is  analyzed,  and  the vertical  component  is  shown  to be dominant  in  the HSR  envi-ronmental vibration. On this basis, numerical simulations are performed to analyze the environmental vibration reduction under three strategies, namely the HIT, EB, and CVR. The results show that the HIT presents a distinct vibration reduction effect in the frequency range above 4 Hz and the vibration reduction becomes more obvious as the HIT’s depth increases. However, the depth should be larger than 8 m to satisfy the code requirement; the EB presents an obvious reduction in the frequency range above 8Hz; the CVR strategy not only further decrease the environmental vibration, but also effectively reduce the HIT’s depth. By numerical analysis, the combination strategy of 6 m deep HIT and 2200 kN/mm vertical  stiffness EB  is  recommended  in  the HSR environmental vibration reduction, which could also satisfy the limit of Chinese railway code.

Keywords: Environmental vibration;High-speed railway;Combination vibration reduction strategy;Hollow-closed-wall in-filled trench;Elastic bearing;Train-track-bridge coupled system

 
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