Consolidation and strength characteristics of Ariake soft clay

有明软粘土的固结及强度特性

• 批准号: 04452296
• 负责人: TAKAYAMA Masateru
• 金额: $ 4.61万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452296/
• 关键词: Ariake Clay; Flocculation; Self-Weight Consolidation; Zeta Potential; Secondary Consolidation; Deformation Analysis; Pyrite; 凝集・沈降; 非排水強度; 軟弱粘土; 強度異方性

The present paper describes the settling and flocculation characteristics of clay particles and the self-weight consolidation characteristics of slurried clay associated with the development of tidal flat in Ariake Bay coastal area, and also the problems involved in the consolidation and slope failure of clays.Flocculation of Ariake clay occurs under the salt concentrations above 0.1g/1, and the maximum zeta potential of the clays when the flocculation occurs is -20mv. The flocculative, interface, and compression settlings occur at the initial water content of above 5000%, 5000 to 1000%, and below 1000%, respectively. The self-weight consolidation tests in cylinders for different clay layr thickness, is also proposed.The study of the consolidation of clays confirmed that the secondary consolidation started when the degree of consolidation reached to around 90%, and the degree of consolidation for secondary consolidation proportional to the time in logarithmic scale is above 98%.The parameters required for the strength and deformation analysis are presented, and the bearing capacity analysis for normally consolidated clay ground was performed under a partially drained condition.The investigation of the chemistry of Ariake clay indicated that the production of the sulfuric acid and iron oxide due to pyrite oxidation in the clays decreases pH below 4, which releases the adsorbed zinc on the clay surfaces, leading to the potential risk of groundwater contamination.

本文介绍了有明湾沿岸滩涂发育过程中粘土颗粒的沉降絮凝特性和泥质粘土的自重固结特性，以及粘土固结和边坡破坏所涉及的问题。在0.1g/1以上的盐浓度下，有明黏土发生絮凝，絮凝发生时黏土zeta电位最大值为-20mv。絮凝沉降、界面沉降和压缩沉降分别发生在初始含水量大于5000%、5000 ~ 1000%和小于1000%时。提出了不同粘土层厚度下的自重固结试验。对粘土的固结研究证实，二次固结开始于固结度达到90%左右，且二次固结度在对数尺度上与时间成正比在98%以上。提出了强度和变形分析所需的参数，并对正常固结粘土地基进行了部分排水条件下的承载力分析。对有明黏土化学性质的研究表明，黏土中黄铁矿氧化产生硫酸和氧化铁，使pH值降低到4以下，使吸附在黏土表面的锌释放出来，造成地下水污染的潜在风险。

项目成果

東 孝寛・高山昌照 近藤文義: "河川〓〓土の凝集・沈降特性に関する研究" 平成5年度農業土木学会大会講演会講演要旨集. 614-615 (1993)

Takahiro Higashi、Masateru Takayama、Fumiyoshi Kondo：“河流土壤絮凝和沉积特性的研究”1993年日本农业和土木工程师学会会议摘要614-615（1993）。

大坪政美: "海成粘土表層部の風化による酸化鉄の生成と粘土の強度特性" 第74回農業土木学会九州支部講演集. 227-230 (1993)

Masami Otsubo：“由于海洋粘土表层的风化而形成的氧化铁和粘土的强度特性”日本农业土木工程学会第74届九州分会会议记录227-230（1993）。

大坪 政美: "海成粘土表層部における酸化鉄の生成と粘土の工学的性質" 農業土木学会論文集. (印刷中). (1995)

Masami Otsubo：“海洋粘土表面层氧化铁的形成和粘土的工程特性”，日本农业和土木工程师学会会刊（1995 年出版）。

Ohtubo,M.: "Depositional and postdepositional geochemistry,and their correlation with geotechnical properties,of marine clays in Ariake Bay,Japan" Geotechnique. 45(印刷中). (1995)

Ohtubo, M.：“日本有明湾海洋粘土的沉积和沉积后地球化学及其与岩土工程特性的相关性”Geotechnique 45（出版中）。

近藤文義・高山昌照 大坪政美・東 孝寛: "有明粘土2種類の凝集・沈降特性の違いと粘土のフロック形状、ゼータ電位" 第74回農業土木学会九州支部講演集. 231-234 (1993)

Fumiyoshi Kondo、Masateru Takayama、Masami Otsubo、Takahiro Higashi：“两种有明粘土的絮凝和沉降特性、粘土絮状形状和zeta电位的差异”日本农业土木工程学会第74届九州分会会议记录231-234（1993）