摘要
以云南红土为研究对象,以六偏磷酸钠为污染源,通过磷污染红土的土柱迁移试验,研究了磷污染红土的物理特性随土柱不同位置深度的迁移变化。试验结果表明：磷污染改变了红土的物理特性。在土柱表层,磷污染红土的相对质量、黏粒含量、塑性指数增大;随土柱位置深度的增加,磷污染红土的相对质量、黏粒含量减小,液限、塑限和塑性指数在3~5 cm处存在最小值。磷迁移对红土物理性质的影响,关键在于六偏磷酸钠与红土间的相互作用,体现在水解氧化、侵蚀、胶结、溶解、迁移等五个方面,迁移过程中,随土柱位置深度的增加,磷土作用能力降低,对红土物理性质的影响程度减弱。
The physical characteristics of laterite contaminated by phosphorus have been investigated. Soil column migration tests are carried out on Yunnan laterite with sodium hexametaphosphate associated with the influence of the depth of soil column tests. It has been proved that the relative quality,clay content and plasticity index increase on the surface of the soil column. As the depth of soil column increases,the relative quality,clay content decrease,but a minimum value appears in the boundaries moisture content on the 3 ~5cm of soil column. The action mechanism towards laterite contaminated by phosphorus could be accounted for hydrolyzationoxygenization,erosion,cementation,dissolution,reduction-oxidation and migration. The changes of the physical characteristics of laterite contaminated by phosphorus may be the result of those comprehensive actions. As the depth of soil column increases,the ability of phosphorus acted on soil decreases,so do the physical properties of laterite.
出处
《四川建筑科学研究》
北大核心
2016年第4期50-54,共5页
Sichuan Building Science
基金
国家自然科学基金项目(51168022
51269006)
云南应用基础研究计划重点项目(2013FA033)
昆明理工大学分析测试基金项目(20140980)
关键词
磷污染红土
迁移条件
颗粒特性
含水特性
磷土作用
laterite contaminated by phosphorus
the migration condition
grain characteristics
moisture content characteristics
action mechanism
