含盐量对石灰固化滨海盐渍土稠度和击实性能的影响  

Different salt contents effect on consistency and compactness of saline soil in inshore with lime

作　　者：柴寿喜[1,2] 王晓燕[3] 仲晓梅[1,2] 郭英[1] 王沛[1] 李芳[1] 

机构地区：[1]天津城市建设学院土木工程系,天津300384 [2]天津市软土特性与工程环境重点实验室,天津300384 [3]中水北方勘测设计研究有限责任公司勘察院,天津300222

出　　处：《岩土力学》2008年第11期3066-3070,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.40772166);天津市自然科学基金(No.05YFSYSF00300;No.07JCYBJC12900);天津市高等学校科技发展基金(No.20051404);建设部研究开发项目(06-K1-5);天津市建委科技项目(2007-43)

摘　　要：随着含盐量的增加,滨海盐渍土中的盐分结晶形成了更多的盐颗粒,使石灰固化土的稠度指标发生变化,总体上分阶段逐渐下降。含盐量的增加使得石灰固化土的不均匀系数增大,且随着养护龄期的增加而增大。增加土的含盐量,则石灰固化土悬液的电导率随之增加,但电导率几乎不随养护龄期而变化,这表明氯盐没有参与石灰的固化反应,只是吸附在土颗粒的表面或存在土孔隙中,石灰固化后的盐渍土仍然具有一定的吸湿软化性。重型击实试验结果证实,增加含盐量使石灰土混合料的最大干密度略有降低,最优含水率则几乎不变,因此,施工中可不考虑含盐量对石灰固化滨海盐渍土现场碾压效果的影响。With the increase of salt content of saline soil in inshore, the salt particles are formed in soil, in general, which presenting an appearance of different sections and causing the consistency indices of solidified soil drop gradually. Uniformity coefficient of the solidified soil with lime increases with more salt content and more curing periods. Conductivity of the solidified soil has been increasing with more salt content and increasing hardly with more curing periods. It has been certified that salt has no action in the chemical reaction of lime and soil, salt is still on the surface of soil particles or in the pores of soil, and the solidified soil will be softened because of absorption of water. It has been proved that maximum dry density drops slightly; and optimum water content is hardly change with the increase of salt content on the basis of compaction test; and in situ salt content effects scarcely on compactness of saline soil in inshore with lime.

关 键 词：滨海盐渍土 行灰固化土 含盐量 稠度 击实试验 电导率 

分 类 号：TU448[建筑科学—岩土工程]