含盐土渗透系数变化特征的试验研究

对含盐土的渗透系数进行了室内试验研究.结果表明:在干容重相同的情况下,渗透系数随着含盐量的增加而减小;对同一类型土,随着含盐量的增加,硫酸盐土的渗透系数要比氯盐土渗透系数减小显著;在干容重和盐类相同的情况下,细颗粒含盐土的渗透系数要比粗颗粒含盐土的渗透系数减小显著.在含盐量相同的情况下,同一种土的渗透系数随着干容重的增大而减小.当干容重在一定的范围内时,渗透系数与干容重呈线性关系,但当干容重超过该范围时,渗透系数与干容重呈幂函数关系.

Experimental Study of Permeability Coefficient of Saline Soils

The permeability of saline soils is studied in laboratory.Experiments show that for the same dry density,permeability decreases with the saline content;for the same soil,with increase in saline content,permeability of soils with sodium sulphate decreases more significantly than that with sodium chloride.When soils have the same dry density and the same salt,permeability of fine grained saline soils decreases more remarkably than that of the coarse grained saline soils. If the salt content is constant,for the same soil,the permeability decreases with increase in dry density in a linear relationship within a certain range of dry density;when the dry density is beyond this range,permeability and the dry density are related with a power function.