盐对膨润土-砂土复合防渗层抗渗性影响研究

Influence of Salt on Anti-permeation Performance of Bentonite-sand Composite Layer

以宁夏广泛分布的砂土为研究对象,试验研究了盐浓度、类型对膨润土-砂土复合防渗层抗渗性的作用效应,揭示了盐浓度、类型对膨润土-砂土复合土壤抗渗性的作用机理和作用规律,为含盐砂土防渗层设计、施工提供理论依据。试验研究表明:盐对膨润土-砂土复合土壤的抗渗性有明显的影响,随盐浓度的增加,土壤的抗渗性降低;盐溶液阳离子价位越高,土壤的抗渗性降低程度越大;混合溶液比单一溶液的作用效应高,即土壤的抗渗性降低程度大。

Taking the widely distributed sand in Ningxia as studying object,the influence of salinity and type of salt on anti-permeation performance of bentonite-sand composite layers is experimental studied and the anti-permeation mechanism and rules are discovered,which provided a theory basis for the design and construction.of anti-permeability layer of saliferous sand.The studying results show that salt has obvious influence on anti-permeation performance of bentonite-sand composite,the anti-permeation performace of soil decrease with the increase of salinity.As the salt solution cationic price level becomes higher,the fall degree of anti-permeation performance is larger.The fall effect of mixed liquor is higher than that of pure solution.