It is an important subject to improve the seismic stability of a bridge abutment and backfills against the level-2 seismic motions such as the 1995 Hyogoken-Nanbu earthquake.  A novel and rational form of bridge abutment having high seismic stability has been studied.  Based on past researches, a new type abutment with geogrid-reinforced cement-treated backfills is proposed.  This paper describes an outline of the seismic deign method used to develop the abutment and results of full-scale field loading tests and dynamic analysis.

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