黏性土的物理化学及矿物学性质与分散机理  

Relation among dispersive mechanism,physical-chemical and mineral properties of clayey soil

作　　者：樊恒辉[1] 李洪良[1,2] 赵高文[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]山东昌乐县建筑工程质量监督站,山东昌乐262400

出　　处：《岩土工程学报》2012年第9期1740-1745,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50979094);"十二五"国家科技支撑计划项目(2011BAD31B05);西北农林科技大学基本科研业务费项目(QN2009089)

摘　　要：基于土-水-电解质系统的双电层理论,对48组土样的物理化学及矿物学性质与分散性之间的关系进行了研究,并结合试验验证和工程实例分析,提出黏性土的分散机理。研究表明,黏性土产生分散性的影响因素包括黏粒含量、黏土矿物成分、有机质、钠离子和pH值;但是,决定土体分散性的本质因素则在于介质环境中的钠离子和pH值。土体黏土矿物不论是以蒙脱石还是以伊利石为主,只要土体中含有较多的钠离子和酸碱度呈强碱性,土体就会产生分散性,而且这两个因素缺一不可。Based on the double-layer theory in soil-water-electrolyte system, the relation among the dispersivity, physical, chemical and mineral properties of 48 soil samples is studied. Based on experimental researches and engineering cases, the dispersive mechanism is clarified. The results show that the influence factors of the dispersivity include clay content, clay mineral composition, organic matter, sodium ion and pH value. However, the sodium ion and pH value in the medium are the essential factors. No matter whether the clay mineral in soil is montmorillonite or illite, as long as the soil contains more sodium ions and alkaline pH, the soil will be dispersed. Both of them are indispensable.

关 键 词：分散性土 物理化学性质 矿物成分 分散机理 

分 类 号：TV443[水利工程—水工结构工程]