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The Role of Cementation and Electrolyte Concentration in Marine Clay Behavior

胶结作用和电解质浓度在海洋粘土行为中的作用

基本信息

批准号：
63560232
负责人：
OHTSUBO Masami
金额：
$ 1.86万
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 (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

1. The samples of Ariake clay sediment contain smectite, vermiculite, kaolinite, illite, and chrolite as clay minerals, and the smectite content varies from 50% at the surface zone to 20% at the depth of 17m. The chlorine concentration of the clay sediment increased from 0.07N at the surface zone to 0.3N at the depth of 4m and then decreased to 0.01N at further depth. The variation of the ratio of undrained shear strength against overburden pressure was explained in terms of the clay content and salt concentration, and another factor of pH was added to explain the variation of the liquid and plastic limits.2. A negative correlation was observed between the mean particlediameter of flocks in the suspensions and the zeta potential. The sediment volume of the clay suspensions of pH7 was found to be positively correlated with mean particle-diameter of flocks. The void ratio of the sediment exhibited a rapid decrease with increasing depth at the surface zone and a subsequent slow decrease at greater depth.3. Addition of the iron oxides to the illite increased the yield stress over a pH range of 3 to 10. With increasing pH the yield stress decreased for for the complexes with iron oxides of 2 and 5% while the complexes with iron oxides of 7, 10, and 20% exhibited the maximum yield stresses at the pH values of 6 to 8. The yield stress for the complexes was correlated with their zeta potential, and the higher yield stress was explained to be due to smaller interparticle repulsion.

1.有明粘土沉积物样品中含有蒙皂石、蛭石、高岭石、伊利石和铬铁矿等粘土矿物，蒙皂石含量从表层的50%到17m深处的20%不等。粘土沉积物中氯的浓度从表层的0.07N增加到4m深处的0.3N，然后下降到0.01N。用粘土含量和盐浓度解释了不排水抗剪强度与上覆压力之比的变化，并加入pH值的另一个因素来解释液限和塑限的变化。悬浮液中絮体的平均粒径与zeta电位呈负相关。pH为7的粘土悬浮液的沉降量与絮凝体的平均粒径呈正相关。沉积物的孔隙比在表层随深度的增加而迅速减小，在更深处则缓慢减小.在3至10的pH范围内，向伊利石中添加铁氧化物增加了屈服应力。随着pH值的增加，铁氧化物的复合物的屈服应力降低为2和5%，而铁氧化物的复合物的7，10，和20%的表现出最大的屈服应力在pH值为6至8。复合物的屈服应力与它们的zeta电位相关，较高的屈服应力被解释为是由于较小的粒子间排斥。