易溶盐对伊犁黄土湿陷性的影响

Effect of Soluble Salt on Collapsibility of Ili Loess

为了研究易溶盐含量对伊犁黄土湿陷性的影响,以伊犁黄土为研究对象,采用双线法分析不同含水率、压力、易溶盐种类和易溶盐含量对黄土湿陷性的影响。结果表明:易溶盐含量对黄土湿陷性有一定影响,与无盐黄土相比,易溶盐黄土湿陷系数有一定下降;不同种类易溶盐对黄土湿陷变形影响不同,100 kPa压力且土壤含水率为7.0%条件下,50 mmol·kg^(-1) NaCl易溶盐土壤湿陷系数为0.01,50 mmol·kg^(-1)Na_2SO_4易溶盐土壤湿陷系数为0.16,100 mmol·kg^(-1)NaCl易溶盐土壤湿陷系数为0.06,100 mmol·kg^(-1)Na_2SO_4易溶盐土壤湿陷系数为0.17;土壤含水率及外界压力均对黄土湿陷系数有一定影响。

The study focuses on the effect of the soluble salt content on the collapsibility of Ili loess.The double oedometer test method was used to analyze the influence of water content,pressure,the type and content of soluble salts on the collapsibility of Ili loess.The results show that the content of soluble salt has certain influence on the collapsibility of Ili loess,and the collapsibility coefficient of loess with soluble salt is smaller than that of salt free loess.Different types of soluble salt have different effects on the collapsible deformation of loess.When the pressure is 100 kPa and the soil water content is 7.0%,the coefficient of 50 mmol·kg ^-1 NaCl soluble salt soil is 0.01,and the coefficient of the 50 mmol·kg^-1 Na2SO4 soluble salt soil is 0.16.The collapsibility coefficient of 100 mmol·kg ^-1 NaCl soluble salt soil and 100 mmol·kg^-1 Na2SO4 soluble salt soil is 0.06 and 0.17,respectively.Soil water content and ambient pressure have certain influence on the collapsibility of loess.