Effect of Blockage on the Compression Wave Propagating along a High-Speed Railway Tunnel

초록

The fate of a compression wave propagating inside a tunnel is dependant on various parameters viz. the train speed, blockage, tunnel wall skin friction, ballast or slab track, tunnel length and hydraulic diameter of the tunnel. But, the two main factors that affect the intensity of entry compression wave is train speed and blockage ratio. Once the wave is developed the propagating compression wave either steepens or distorts while propagating based on the blockage and friction parameters involved inside the tunnel. In the current study, the effect of tunnel blockage on the propagating compression wave has been studied using 2-D CFD method. Inviscid equations are solved with source terms involving steady and unsteady friction parameters. Five different cases of blockage are tried and the attenuation and distortion rate has been depicted with the help of pressure monitors on the wall and elaborated using pressure contours.