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Influence of Aging Effect of Clay on Consolidation and Strength Characteristics

粘土老化效应对固结及强度特性的影响

基本信息

批准号：
12660224
负责人：
OHTSUBO Masami
金额：
$ 2.37万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12660224/
关键词：
Cementation iron oxide shear strength consolidation zeta potential 塩類溶脱鋭敏比透水性

项目摘要

Electron micrograph showed that association between iron oxide and kaolinite particle is affected by the initial pH of the complex. The iron oxide in the complex prepared at initial pH3 was retained on the surface of the particle even after the pH of the complex was raised to 9.7. The iron oxide of the complex prepared at initial pH9.5 is independent with clay particles above isoelecric point (pH8). Below pH8, some parts of iron oxide is retained on the clay surfaces, and complete association of iron oxide and clay particle need the reduction of pH below 4.The effect of iron oxide on Bingham yield stress differs according to the form of association between iron oxide and clay particles. The iron oxide that is not associated with clay particles contribute to enhance Bingham yield stress more than the iron oxide precipitated on the surface of clay particles. This is attributed to the electrical interparticle bridge of iron oxides that are not associated with clay particles.Chlorine concentration in the pore water for Ariake clay decreased from 10.8 to 0.011g/L by salt leaching. Undisturbed shear strength of the clay was reduced markedly compared with remoulded shear strength, resulting in the increase of sensitivity from 20 to 594. Consolidation coefficient decreased by about 50% by salt leaching for both undisturbed and remoulded clay samples. This is brought about by the reduction of permeability of the clay samples.Smecitite content of marine clay is 10 to 60% for Isahaya clay and 36 to 85% for Hachirogata clay. With increase of smectite percentage, the liquid limit and compression index of the clay increase while the permeability and consolidation coefficient of the clay decrease.

电子显微镜观察表明，氧化铁与高岭石颗粒之间的缔合作用受络合物初始pH值的影响。在初始pH 3下制备的络合物中的氧化铁即使在络合物的pH升高至9.7之后也保留在颗粒的表面上。在pH = 9.5时，在等电点以上（pH = 8），铁氧化物的生成与粘土颗粒无关。pH值低于8时，部分氧化铁留在粘土颗粒表面，氧化铁与粘土颗粒的完全结合需要pH值降低到4以下。氧化铁对粘土颗粒的宾汉屈服应力的影响因氧化铁与粘土颗粒结合形式的不同而不同。与粘土颗粒无关的氧化铁比沉淀在粘土颗粒表面的氧化铁更有助于提高宾汉屈服应力。这是由于未与粘土颗粒结合的铁氧化物的颗粒间电性桥作用的结果。原状土的抗剪强度较重塑土的抗剪强度显著降低，敏感性由20提高到594。原状土样和重塑土样的固结系数经淋滤后均降低约50%。这是由于粘土样品的渗透性降低造成的。海相粘土中蒙脱石的含量在伊沙亚粘土中为10 - 60%，在八郎方粘土中为36 - 85%。随着蒙皂石掺量的增加，粘土的液限和压缩指数增大，渗透系数和固结系数减小。