EFFECT OF SOIL NAILS ON SEISMIC STABILITY OF DAMAGED REINFORCED SOIL WALL

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  • 損傷した補強土壁の耐震性におけるソイルネイル補修の効果

Abstract

To investigate the effect of soil nails in repairing damaged geogrid reinforced soil walls (GRSWs), a series of model shaking table tests on GRSWs was carries out to simulate earthquake damage by the first shaking, repair with soil nails, and the second shaking to estimate seismic stability of the repaired GRSW. The results showed that the seismic resistance of the damaged GRSW was improved by adding soil nails. Effectiveness of adding soil nails in improving the seismic resistance was found to depend on the length of the soil nails and the degree of damage to the GRSW. Soil nails which were longer than geogrids suppressed the formation of vertical shear plane behind the geogrid reinforced zone. Therefore, seismic stability of the damaged GRSW increased by long soil nails.

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