大坝土料的物理化学性质及分散性试验研究  

Study on physicochemical property and dispersivity test of soil material of dam

作　　者：李洪良[1] 党进谦[1] 樊恒辉[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：《人民长江》2010年第2期84-86,100,共4页Yangtze River

基　　金：国家自然科学基金(50979094);西北农林科技大学青年学术骨干项目(08);西北农林科技大学科研专项(06ZR41)

摘　　要：粘土的分散性与粘土的物理化学性质存在一定的关系。通过对某工程土料的物理化学性质分析,并结合针孔试验、碎块试验、双比重计法、孔隙水阳离子试验和交换性钠百分比试验5种分散性鉴定试验对粘土的分散机理进行了研究。研究表明:粘土的分散性与粘土物理化学性质密切相关,尤其体现在Na+含量和pH值上,一定百分含量的Na+和一定程度的pH值是土体产生分散性同时具备的两个必要条件,且应该存在一定的量化关系。We studied the dispersive mechanism of clay by analyzing the physicochemical property of soil material of dam, combining 5 dispersive identifications such as pinhole test, crumb test, double - hydrometer test, as well as the test to determine salt content of pore water and percentage of changeable sodium and seepage distortion test. The results show that the dispersivity of clay is closely related to its physicochemical property, a certain content of Na ~ and a certain degree of pH are the necessary conditions for soil body＇s dispersivity, and a quantitative relationship between them may exist.

关 键 词：分散性粘土 分散机理 PH值 钠离子 

分 类 号：TU41[建筑科学—岩土工程]