Research on Reliability of Wavefront Generator for High-Speed Railway Tunnel

This paper evaluates the reliability of pressure wavefront generator which can generate tunnel compression waves. Firstly, the composition and principle of the pressure wavefront generator are briefly introduced. Secondly, the three-dimensional effect of the initial compression wave propagating in the tunnel model is analyzed. Finally, the influence law of each parameter of the wavefront generator on the compression wave characteristics is explored; and the corresponding repeatability variation curves are plotted. The results of the study show that the pressure consistency of the cross-section in the tunnel does not change due to the variation of the generator parameters, i.e. there is no significant three-dimensional effect when the compression wave propagates in the tunnel model. The pressure amplitude of the compression wave is approximately linearly related to the initial pressure of high-pressured chamber and the number of solenoid valve openings, and the maximum pressure gradient of the compression wave is approximately proportional to the square of the operating voltage of solenoid valve and approximately linearly related to the number of solenoid valve openings.