氧化铁胶体与黏土矿物的交互作用及其对黏土土性影响

张先伟; 孔令伟

doi:10.11779/CJGE201401004

氧化铁胶体与黏土矿物的交互作用及其对黏土土性影响 English Version

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉 430071

基金项目: 国家自然科学基金项目（41102200,51179186）

详细信息

作者简介:
张先伟(1982- )，男，黑龙江龙江人，博士，助理研究员，从事特殊土的力学特性研究。E-mail: xwzhang@whrsm.ac.cn。

中图分类号: TU442
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出版历程
- 收稿日期: 2013-04-21
- 发布日期: 2014-01-20

Interaction between iron oxide colloids and clay minerals and its effect on properties of caly

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

摘要

摘要: 以湛江黏土为研究对象,采用选择性化学溶解法,利用浸泡法、改进型渗透仪与柔性壁渗透仪除去土中游离氧化铁、无定形氧化铁和络合铁胶体,比较分析除去氧化铁胶体前后土的物理与力学性质指标、矿物成分以及结构变化特点,探讨氧化铁胶体的界面活性、胶结特性及其与黏土矿物的交互作用。结果表明,湛江黏土的结构强度受黏土矿物——氧化铁胶体的电性引力和镶嵌孔隙的氧化铁胶结状态的控制是导致其具有高灵敏性、强结构性的根本原因。氧化铁胶体对湛江黏土的水稳性、稠度、黏附性、渗透性、压缩性、灵敏性、结构强度均有重要影响。氧化铁胶体与黏土矿物的交互作用的本质并不是通过改变和破坏矿物晶格结构来改变黏土矿物性质,而是通过改变土颗粒间的联结状态及粒间力来控制微观结构形态,进而影响土的基本性质。氧化铁胶体对土性的影响程度与其赋存状态、老化结晶程度、水化程度密切相关,除了游离氧化铁、无定形态的氧化铁也是构成湛江黏土胶质联结的重要组成部分。
- 湛江黏土 /
- 氧化铁胶体 /
- 黏土矿物 /
- 交互作用 /
- 微观结构
Abstract: For Zhanjiang clay, the free iron oxide colloids, amorphous iron oxide colloids and using the selective chemical solution method by immersion, improved permeameters and flexible wall permeameters, chelated iron colloids in it are removed. In this analysis, the physical and mechanical properties, mineral composition and structural changes of Zhanjiang clay are compared before and after removing the iron oxide colloids. The interface activity and cementation characteristics of iron oxide colloids and their interaction with clay minerals are discussed. The results show that Zhanjiang clay has the properties of high sensitivity and strong structure owing to the electrical attraction of clay minerals——iron oxide colloids and their cemented connection in pores. The iron oxide colloids have great effects on the properties of Zhanjiang clay, including water stability, consistency, adhesion, permeability, compressibility, sensitivity and structural strength. The interaction mechanism between the iron oxide colloids and the clay minerals leads to change of the basic properties of clay, which is not achieved by changing or destructing the mineral lattice structure, but by controlling the microstructural morphology by changing the coupling states of soil particles and inter-particle forces. As for the iron oxide colloids, both their effects on the soil properties and the mode of occurrence are closely related. Besides the free iron oxide, the amorphous iron oxide is the other important component of microstructural cemented connection of Zhanjiang clay.
- Zhanjiang clay /
- iron oxide colloid /
- clay mineral /
- interaction /
- microstructure

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