A study of soil dispersivity in Qian'an, western Jilin Province of China  

作　　者：XuDong Zhang Qing Wang TianWen Yu ShuoChao Bao Gang Wang Xin Zhou CenCen Niu 

机构地区：[1]College of Construction Engineering, Jilin University

出　　处：《Research in Cold and Arid Regions》2015年第5期579-586,共8页寒旱区科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41372267,41402243);the State Key Program of the National Natural Science Foundation of China(No.41430642)

摘　　要：Saline soil is vulnerable to water erosion because of its dispersivity. This characteristic has a great influence on dam and slope engineering. There is a large area of saline soil in western Jilin Province, the seasonal frost zone, and this soil is highly dispersive. We studied the properties of soil samples collected from vertical holes near Qian＇an Dabusu Lake, as- sessing the particle size distribution and the chemical components. We also comprehensively identified the level of soil dispersivity by three standard methods, the pinhole test, the crumb test, and the double-hydrometer test. The soil compo- sition and basic physicochemical properties are proved to be the most important factors which determine the dispersion degree of the saline soil. Our results showed that, within depth ranges from 0 to 1 m, silt particles highly influenced the soil dispersivity, and the total soluble salt accounted for ≥0.3%. At the first sampling point, in a tall soil column, the dispersion degree decreased with increasing depth, but this was not as obvious at the second sampling point, which was in a flat area. Nevertheless, the superficial soils of these two sampling sites were strongly dispersive, which must be taken into consid- eration for soil engineering in this region.Saline soil is vulnerable to water erosion because of its dispersivity. This characteristic has a great influence on dam and slope engineering. There is a large area of saline soil in western Jilin Province, the seasonal frost zone, and this soil is highly dispersive. We studied the properties of soil samples collected from vertical holes near Qian＇an Dabusu Lake, as- sessing the particle size distribution and the chemical components. We also comprehensively identified the level of soil dispersivity by three standard methods, the pinhole test, the crumb test, and the double-hydrometer test. The soil compo- sition and basic physicochemical properties are proved to be the most important factors which determine the dispersion degree of the saline soil. Our results showed that, within depth ranges from 0 to 1 m, silt particles highly influenced the soil dispersivity, and the total soluble salt accounted for ≥0.3%. At the first sampling point, in a tall soil column, the dispersion degree decreased with increasing depth, but this was not as obvious at the second sampling point, which was in a flat area. Nevertheless, the superficial soils of these two sampling sites were strongly dispersive, which must be taken into consid- eration for soil engineering in this region.

关 键 词：particle-size analysis chemical properties DISPERSIVITY DISPERSION 

分 类 号：P642.1[天文地球—工程地质学]