QUANTITATIVE EVALUATION OF DRAINAGE EFFECT BY THE EXCESS PORE WATER PRESSURE DISSIPATION METHOD IN HORIZONTAL BEDDED GROUND DURING A LARGE EARTHQUAKE

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  • 大規模地震時における水平成層地盤を対象とした過剰間隙水圧消散工法の排水効果の定量評価

Abstract

 The excess pore water pressure dissipation method is one of the liquefaction mitigation techniques. It is designed generally not to liquefy for the ground motion level 1. Though some kind of drainage effects might be expected even if a ground motion is larger than the level 1, the quantitative effects of this method is unknown. In order to quantitatively evaluate these effects, an effective stress analysis using the strain space multiple mechanism model is conducted for the centrifuge model tests which conducted in the past. In addition, in order to evaluate a drainage effect against the real large earthquakes observed in the past, an effective stress analysis using the same model is conducted for the ground model using in the centrifuge model tests.<br> Based on the results of this study, it was found that the strain space multiple mechanism model might be applicable to quantitatively evaluate the drainage effects by the excess pore water pressure dissipation method in horizontal bedded ground during a large earthquake.

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