LIQUEFACTION COUNTERMEASURE EFFECT OF GRID FORM DEEP MIXING WALL WITH OBLIQUE WALL

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  • 斜め壁を有する格子状地盤改良工法の液状化対策効果

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<p> In this report the grid-form deep mixing wall was discussed as the liquefaction countermeasure method for existing structure. If the grid spacing is wider due to the existing structure, the effect of liquefaction countermeasures will be reduced. Therefore, in this study, liquefaction countermeasures by combining oblique wall with relatively wide-interval grid-form deep mixing wall improvement was investigated. It was found that liquefaction can be suppressed if measures are taken in combination with oblique wall of about 1/3 of the depth of grid-form deep mixing wall. It was also found that when the grid-form deep mixing wall and the oblique wall are not rigidly connected, the subsidence after liquefaction will be larger than that that is rigidly connected. However it will be about half that of no countermeasures. According to static numerical analysis, the horizontal rigidity of the grid-form deep mixing wall combined with the oblique wall is about 5 times larger than that of the grid-form deep mixing wall alone. Therefore, it is considered that the liquefaction was suppressed.</p>

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