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転炉スラグを用いたコンパクションパイルによる地盤改良

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.20 (1988) No.1

転炉スラグを用いたコンパクションパイルによる地盤改良

Soil Improvement Using Converter Slag Compaction Pile Method

木村 保(Tamotsu Kimura) 和田 啓(Kei Wada) 塩田 啓介(Keisuke Shiota) 奥 村 一郎(Ichiro Okumura) 三沢 久詩(Hisashi misawa) 川鍋 修(Shu Kawanabe) 要旨 : 転炉スラグのコンパクションパイルにおける適用性と経済的な設計法について検討するた め,液状化防止を目的とした地盤改良現場に試験工区を設けて改良効果の調査を行った。 改良前後のみならず,改良 2 年後においてそれぞれ土質調査を実施し,改良効果の経時変 化をとらえた。また,パイル間隔の影響や砂を用いた場合との相違についても調べた。N 値,せん断弾性係数,横方向地盤反力係数,静止土圧係数はともに改良直後に増加し,長 期経過後も改良直後と同等以上の値を示すことが確認され,転炉スラグがパイル材料に適 していることが明らかになった。また,静止土圧係数の増加を考慮した経済的な設計法に ついて考察を行った。 Synopsis :

The application of converter slag to the compaction pile method has been investigated using field measurements at a construction site for soil improvement. The measurement were made before, immediately after, and 2 years after soil improvement. The N-value, shear modulus, coefficient of horizontal subgrade reaction and coefficient of earth pressure at rest were increased by this soil improvement technique. These effects of the improvement were also observed in measurements 2 years after the soil improvement. As a result of this investigation, it was found that the converter slag was useful as a material for compaction piles. An economical design method, which considers the increase in the coefficient of earth pressure at rest, was also analyzed.

(c)JFE Steel Corporation, 2003

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