1F23 Analysis on the derailment mechanism of rail vehicle due to large earthquakes with experiments and simulation (Vehicles-Rail/Wheel)

抄録

It is well known that enhancing safety against a large earthquake is recognized as a very important issue in Japan. So, constant effort is made to address this issue along the Tokaido Shinkansen. For example, the railway infrastructure has been reinforced and a new alert system has been deployed to regulate train operation so that trains cease running immediately should a large earthquake occur. Nevertheless, during the Mid-Niigata Prefecture Earthquake in 2004, the Shinkansen train traveling at a speed of 200km/h was derailed by the ground motion of the earthquake with no catastrophic damage to the railway tracks or structures. These fact and reports concerning that accident indicated that railway vehicle could be derailed solely by the ground motion of large earthquakes with application of the existing measures at the time. Therefore, Central Japan Railway Company (JR Central) started to study derailment mechanisms during large earthquakes and to develop new effective measures to minimize such the risk of high-speed railway vehicles derailing or and deviating. The derailment mechanism and effectiveness of an anti-derailing guardrail has been verified through full scale experiment with a real Shinkansen bogie and track, and 1/5 scale experiment. The test vehicles are standing still on shaking tracks in the experiments. So, firstly an experiment with 1 1/10 scale vehicle and roller rig was arranged providing both conditions of high speed wheel/rail rolling contact and large amplitude excitations. Then finally, as shown in Fig.1, a full scale experiment with a high-speed running real Shinkansen bogie on the roller rig of the test facility at Komaki Research Center of JR Central was carried. Also, a simulation program has been developed to approach this issue theoretically. Those results and findings obtained through the experiments and simulation indicated there was good agreement. In this paper, the test results and the analysis of the full scale experiment with a high-speed running real Shinkansen bogie on the roller rig are discussed.