Simulation on propagation characters of ground vibration induced by in-tunnel excitation source

Qiong Wu,Hougui Zhang,Yang Qu

doi:10.21595/vp.2017.19175

Abstract

In order to find the possibility of setting vibration mitigation measures at the transmission path for in-tunnel excitation source, a numerical calculation model of the tunnel and foundation was constructed. Using measurement vibration as the in-put excitation load, ground vibration propagation characters were calculated in cases of setting two common used vibration isolation measures, including open trench and buried concrete wall barrier. Calculation results indicated the open trench and buried concrete wall barrier can ideally shield the propagation of vibration induced by in-tunnel excitation source.

Highlights

With the rapid development of urban rail transit, environmental pollution caused by urban rail transit has gradually become an environment sensitive topic
To meet the needs of urban environment for traffic vibration control, in addition to the vibration control measures taken on the source, the control measures on the propagation path such as trenches and the partition wall and wave impeding block by the virtue of their effective control of low-frequency vibration, low-cost line investment and restoring the track structure to ensure the safe operation of the vehicle are more and more concerned [1]
Using measurement vibration as the in-put excitation load, ground vibration propagation characters were calculated in cases of setting two common used vibration isolation measures, including open trench and buried concrete wall barrier

Summary

Introduction

With the rapid development of urban rail transit, environmental pollution caused by urban rail transit has gradually become an environment sensitive topic. With C found that the vibration peak of 41-67 % can be reduced in the range of 60 m by studying the vibration reduction effect of the fly ash isolation pile on the parallel railway near Goteborg [3]. Before the operating of Xi’an Metro Line 2, Ma Meng et al studied the vibration isolation effect of the isolated row piles on the subway by numerical calculation [5]. In order to research on vibration mitigation measures at the transmission path for in-tunnel excitation source, a numerical calculation model of the tunnel and foundation was constructed by the FEM software ABAQUS. Using measurement vibration as the in-put excitation load, ground vibration propagation characters were calculated in cases of setting two common used vibration isolation measures, including open trench and buried concrete wall barrier.

Selection of model size and unit size

Selection of material parameters

Setting of boundary parameter and load parameter

Damping and integral steps

Numerical results

Conclusions