EVALUATION OF EXTENT OF EARTHQUAKE DAMAGE TO GEOGRID REINFORCED SOIL WALL BY THE SURFACE SETTLEMENT

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  • 表面沈下量を用いた補強土壁の地震による損傷度評価

Abstract

The aim of this study is to investigate settlement in the backfill of geogrid reinforced soil walls (GRSWs) subjected　to earthquakes as an indicator of extent of damage. A series of shaking table tests were performed on model GRSWs　with varying geogrid stiffness and geogrid content. Settlement at the top of the backfill was measured using a LiDAR　camera. Along with settlement, corresponding deformation of facing wall and distribution of maximum shear strain in　the backfill were studied. Typically, larger settlements were observed to occur behind the reinforced soil block.　Regarding the parameters representing settlement, it was observed that the settlement area offers a more consistent　representation of settlement behavior in the backfill and the extent of damage compared to maximum settlement　measured at a particular section. In the experiments, it was observed that the model walls could not withstand excess　shaking when the normalized settlement area reached around 2%.

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