土壤粘附系统中粘土颗粒群的粘附特性  

ADHESIVE BEHAVIOR OF SOIL PARTICLE AGGREGATES IN THE SOIL ADHESION SYSTEM

作　　者：任露泉[1] 刘朝宗[1] 佟金[1] 李建桥[1] 

机构地区：[1]吉林工业大学农机工程学院

出　　处：《农业机械学报》1997年第4期1-4,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金

摘　　要：从土壤—水系统中粘土颗粒群的性质出发，进一步分析了土壤颗粒群的孔隙结构及其毛细孔道产生的抽吸力，研究了土壤对触土部件表面的粘附过程。结果表明：土壤粘附除了毛细管力、水膜粘滞力及初级化学键力外，粘土颗粒堆积形成的毛细孔道产生的抽吸势对土壤在触土部件表面的粘附有一定的贡献。压力及固体表面热力学因素的共同作用是粘附过程中土体表层颗粒重排及水分再分布的主要原因。he process of soil particles rearrangement and water redistribution during soil adhesion procedure was analyzed in this paper. Results indicated that there existed connected capillary formed in soil body by clay particle packing, and filled with water in it. So capillaceous suctional potential and capillary pressure were developed. The clay colloid was absorbed to each other or to solid surfaces at the interfacial zone due to the capillaceous suctional potential, capillary pressure and water film viscous resistance as well, resulting in adhesion of clay aggregates on the soilworking parts. Physical and chemical actions took place between clay aggregates and solid surfaces through the water bridges, chemisoptive bonds were developed, and the adhesion force between soil and solid surfaces should be increased. It was concluded that, because of the influence of thermodynamical behavior of soilengaging surfaces and under applied pressure, the soil particles rearrangement and water redistribution occurred through the interface of soil adhesion, leading to the adhesion force strengthening further.

关 键 词：粘土 粘附力 毛细管 土壤力学 

分 类 号：S152.9[农业科学—土壤学]