Method to Simulate Generation of Compression Wave inside a Tunnel at Train Entry with a Simple Geometry Model (Influence of the Offset of Train Axis and the Ground Plane)

Abstract

A method to simulate the generation of tunnel compression wave at train entry is investigated by using a simple geometry model. The tunnel is represented by a circular cylinder and the train by an axisymmetric body which has a cross-sectional area distribution equivalent to that of the actual train. In order to simulate the entry into a double tracked tunnel, the train center axis is positioned offset from the tunnel axis and the effect of the ground plane is treated by the mirror image method. Analysis and model experiments are performed to confirm the validity of the present method to use a simple geometry model. The difference of the peak pressure gradient of the compression wave has turned out to be within a few percent between field measurements and model experiments.