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本論文では，液状化対策として背後地盤を固化処理したケーソン岸壁の振動台実験を行い，ケーソン岸壁の動的安定性に与える固化処理と裏込め石設置の併用効果を明らかにした．以下に得られた結論を示す．(1)ケーソン岸壁の背後地盤を固化処理することで，地震時における岸壁および背後地盤の変形を大きく低減でき，その際には固化処理地盤内に裏込め石を設置することはあまり有効でないと考えられる．(2)ケーソン岸壁の背後地...盤を固化処理すると，地震時における岸壁と固化処理地盤の水平振動の位相差が小さくなり，岸壁と固化処理地盤が一体化して挙動する．このことにより，背後地盤からケーソン岸壁に作用する地震時土圧は固化処理地盤底部の抵抗力に起因して減少するため，ケーソン岸壁の地震時水平変位は減少すると考えられる．
Ground solidification techniques such as cement-mixing and permeable-grouting methods have been developed for the purpose of liquefaction countermeasure. In order to investigate the effect of ground solidification for reducing the seismic damage of caisson type quay-wall, a series of shaking table tests in 1g gravitational field was performed in terms of the combination effect of ground solidification and back-filling stone behind quay-wall. The main conclusions obtained form this study are as follows; 1) Ground solidification behind quay-wall is effective for reducing the seismic damage of quay-wall although the combination of ground solidification and back-filling stone is not useful in current experimental results. 2) The acceleration phase shift between quay-wall and solidified ground is small compared to that without ground solidification and then the seismic behavior of quay-wall sympathizes with solidified ground as if solidified ground and quay-wall are a combined structure. Consequently, the seismic earth pressure from liquefied ground is supported by solidified ground reducing the seismic earth pressure against quay-wall.show more
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