An Experimental Study on Aseismic Countermeasure of Railway Abutments Using Reinforcing Bars Integrated with Side Walls

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  • 地山補強材を用いた側壁との一体化による鉄道橋台の耐震工法に関する実験的検討

Abstract

<p>There have been many reports of damage caused by earthquake-induced lateral displacement on an abutment-backfill interface. As such displacement may lead to the derailment of high-speed trains, earthquake countermeasures for existing railway abutments have become an urgent issue, and various countermeasures have been enforced for the Tokaido Shinkansen line since its opening. As per the current design standards, the existing method for constructing earthquake-resistant countermeasures does not necessarily assume Level 2 (L2) seismic activity. In addition, there are limits to the construction environment and construction efficiency, such as construction on tracks being possible only at night and traffic restrictions on the roads near abutments. Therefore, we aim to develop and apply a method for the construction of earthquake-resistant countermeasures to increase the earthquake resistance of existing railway abutments against L2 seismic activity and enable construction work beside abutments during the day. In this study, we developed a countermeasure construction method for railway abutments using reinforcing bars integrated with side walls and verified its effectiveness through tilting tests and model shaking tests. Based on the results, it is confirmed that the sliding mode of the reinforced abutments with the side wall joints is dominant. Moreover, it is possible to improve the maximum resistance of the abutments and limit their residual horizontal displacement and subsidence of the back embankments near the abutments.</p>

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