蒙脱石对黏性土分散性的影响  

Influence of montmorillonite on dispersivity of clayey soils

作　　者：赵高文[1,2] 樊恒辉[1] 陈华[1] 石美[3] 

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]榆林学院建筑工程系,陕西榆林719000 [3]中国科学院资源环境学院,北京100040

出　　处：《岩土工程学报》2013年第10期1928-1932,共5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)

摘　　要：蒙脱石是土体中最常见的黏土矿物之一,具有很强的亲水性,对土体的水稳性、分散性等工程性质有极大的影响。采用悬液稳定性试验、碎块试验和针孔试验,通过在土体中掺入不同种类和含量的蒙脱石膨润土,研究蒙脱石对土体水稳性、分散性的影响。结果表明:随着土体中钠基蒙脱石膨润土掺量的增加,土体的分散性增强,水稳性降低;钙基蒙脱石的表现与钠基蒙脱石相反,随着土体中钙基蒙脱石膨润土掺量的增加,土体的分散性降低,水稳性增强。研究表明,钠离子是黏性土产生分散性必不可少的因素;蒙脱石的种类不同对黏性土的分散性影响不同,钠基蒙脱石可促进土体的分散性,钙基蒙脱石能抑制土体的分散性。Montmorillonite is one of the most common minerals, which has such strong hydrophilicity that it has a significant influence on the properties of clayey soils. The influence of montmorillonite on water stability and dispersivity of soil is studied by mixing different kinds and contents of montmorillonite using sedimentation tests, pinhole tests and crumb tests. The results show that the dispersivity of soils increases and the stabilization decreases with the increasing content of Na-montmofillonite, but the increasing content of Ca-montmorillonite holds the opposite properties. The researches indicate that the sodium ion is an essential factor of the dispersivity of clayey soils, and that different kinds of montmorillonite have different influences on the dispersivity. Na-montmorillonite can promote the dispersivity of soils, while Ca-montmorillonite can restrain the dispersivity of soils.

关 键 词：黏土矿物 钠基蒙脱石 钙基蒙脱石 水稳性 分散性 

分 类 号：TV443[水利工程—水工结构工程]