Abstract
Experimental study has been conducted to clarify the internal and external pressure variation for KTX(Korea Train eXpress). Abrupt pressure variation gives rise to the ear-discomfort for passenger and fatigue for car body. In this study, the pressure variation of internal and external pressure variation are measured by using KTX and on-board portable data acquisition system in commercial line. The tunnels from 200m to 4000m in length are chosen for the investigation of tunnel length effects. From the results of experiment, the internal pressure variation rate for all the test tunnels is lower than the standard criteria of 200Pa/s. And, the critical tunnel lengths for pressure wave pattern are classified into 7 groups by using theoretical L-t diagram.
