著者
輪湖 建雄 土田 孝 松永 康男 濱本 晃一 岸田 隆夫 深沢 健
出版者
Japan Society of Civil Engineers
雑誌
土木学会論文集 (ISSN:02897806)
巻号頁・発行日
vol.1998, no.602, pp.35-52, 1998-09-20 (Released:2010-08-24)
参考文献数
22
被引用文献数
9 6

阪神・淡路大震災で被災した神戸港のケーソン式岸壁の復旧方法として背面固化による方法が考えられた. 特に嵩上げと耐震性向上を必要とする場合, 従来, 港湾・海洋環境での施工実績が乏しかった軽量混合処理土工法を, 港湾施設へ増粘剤等を用いないで水中施工で適用することが要求された. このため, 筆者らは室内試験・現場打設試験を行って課題を抽出し, それらを満たす施工システムを構築して本施工を実施した. その後, 追跡試験によりその妥当性を検証できた. こうした一連の課題解決方策は, 軽量混合処理土工法ばかりでなく, 他の固化処理工法を適用する上で役立つものと期待される.
著者
半沢 秀郎 岸田 隆夫
出版者
公益社団法人地盤工学会
雑誌
土質工学会論文報告集 (ISSN:03851621)
巻号頁・発行日
vol.21, no.1, pp.39-50, 1981-03-15
被引用文献数
1

Naturally deposited marine clays are usually in overconsolidated state notwithstanding they have not been subjected to release of the overburden because of the additional strength developed by aging effect, such as by secondary compression and chemical bonding. These effects on undrained strength characteristics, such as 1) stress-strain characteristics, 2) overconsolidation ratio, 3) K_0 value and 4) anisotropy in undrained strength are discussed for alluvial marine clays found in the Arabian Gulf and in the Tokyo Bay.It is first shown that clay shows more brittle behaviour as the strength developed by secondary compression and chemical bonding becomes greater. It was found from the study that overconsolidation ratio of the clays investigated can be obtained from the strength ratio between in the field and in normaly consolidated state and that strain value at failure in strength tests shows almost a constant value independing on overconsolidation ratio. In addition, it was strongly suggested that K_0 value and anisotropy in undrained strength (which is a stress induced anisotropy that results from rotation of principal stress during shear) of the clays are independent on overconsolidation ratio and almost the same as the values in normally consolidated state.