影响黏性土分散性的化学因素及机理分析  

Influence of chemical factors on dispersivity of clayey soil and the dispersive mechanism

作　　者：赵高文[1] 樊恒辉[1] 陈华[1] 王中妮[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

出　　处：《西北农林科技大学学报（自然科学版）》2013年第6期202-206,共5页Journal of Northwest A&F University(Natural Science Edition)

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：【目的】分析影响黏性土分散性的化学因素和机理。【方法】采用针孔试验、碎块试验,研究了蒙脱石种类、Na+和pH等化学因素对黏性土分散性的影响,并对其作用机理进行了分析。【结果】蒙脱石对分散性的影响与其离子基团有关,钙基蒙脱石具有抑制黏性土分散性的作用,钠基蒙脱石含量与分散化程度呈正相关。土体中的Na+含量越高,土体分散性越强;pH越高,土体分散性亦越强。【结论】同时具备高pH和高含量Na+是黏性土具有分散性的本质原因,土的分散性与矿物成分无关。【Objective】 The paper analyzed the chemical factors influencing the dispersivity of clay and the mechanics of dispersivity.【Method】 Influence of mineral properties,sodium ion,and pH value on dispersivity of clayey soil was studied based on the pinhole test and crumb test.【Result】 Influence of montmorillonite on dispersivity of clayey soil depended on the ions.Montmorillonite with sodium ion made clay samples easier to get dispersivity,while montmorillonite with calcium ion had inhibiting effect on dispersivity.The degree of dispersivity increased as the increase of pH and content of sodium ion.【Conclusion】 Higher pH and content of sodium ion were the essential factors of dispersivity while mineral properties were not.

关 键 词：水工材料 分散性土 分散机理 蒙脱石 钠离子 pH值 

分 类 号：TV443.1[水利工程—水工结构工程]