液状化現象を逆手に取った地盤免震技術(飛躍する耐震技術-実務への適用-)

概要

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The Liquefied layer operates as a isolated layer, thus accelerations in shallow layers become small. In this paper, paying attention to the isolation effect, "ground isolation method" is introduced. This is positive utilizing of liquefaction phenomena. This method enables to cost effective designs and shorten the term of constructions. Ground isolation method is suitable for direct foundation structures, small aspect ratio structures and structures which is fragile for inersia. Necessary conditions on this method are (1) improved area is enough compared with liquefiable soil, (2) ground below the liquefiable layer is also stiff. The depth of unimproved layer is determined by the allowable settlement. The method is also effective for soft clay and artificial soft materials, thus future applications are expected. Residual deformation and its control are problems to solve.
社団法人地盤工学会の論文
2003-03-01