Experimental validation of a numerical model for the ground vibration from trains in tunnels
Invited paper
ISVR, University of Southampton
Tuesday 2 june, 2015, 14:40 - 15:00
0.1 London (90)
Abstract:
The ground vibration and ground-borne noise from trains in tunnels is
attracting increasing attention from researchers and engineers. It is an
important part of the environmental issue related with the operation of
underground networks in the intensively-populated urban areas. An accurate
prediction for this train-induced vibration can be very helpful in the
implementation of countermeasures to achieve the control of vibration or noise
levels. In this paper, a numerical model is introduced based on the 2.5D
Finite Element / Boundary Element methodology. The part of the metro line
concerned is built with a cast-iron tunnel lining. The tunnel structure and
the track are modelled with finite elements while the ground is modelled using
boundary elements. Then the 2.5D track-tunnel-ground model is coupled with a
multiple-rigid body vehicle model to determine the response caused by the
passage of a train. To validate the prediction results, measurements have been
carried out of the vibration of the rail, tunnel invert, tunnel wall and
ground surface when the train is passing by and these are compared with the
predictions. The effectiveness of potential mitigation measures in reducing
the vibration can also be anticipated by the numerical model.