硫酸盐渍土变形特性试验研究

The Experimental Study of Deformation Behaviors of Sulphate Salt Soil

盐渍土作为一类特殊的工程地质体,其变形特性受环境的影响繁多而复杂.通过郑徐高铁兰考段硫酸盐渍土的室内变水头渗透试验及标准固结试验,研究了不同含盐量的硫酸盐渍土渗透系数与压缩系数在不同含盐量下的变化规律.研究结果表明：在同一含水量条件下,硫酸盐渍土渗透系数随含盐量增加而减小;在干容重为1.75 g/cm^3,含盐量为5％条件下,渗透系数KT∈（4.84 - 8.44）×10^-5 cm/s;在同一含盐量条件下,不同含水量的硫酸盐渍土渗透系数几乎不变;在干容重为1.75 g/cm^3,含水量为21％条件下,试样的压缩系数a1-2∈0.21 -0.60 MPa^-1,且随含盐量的增加先减小,在含盐量5％处取得最小值后又略微增加.为郑徐铁路路基的设计及施工提供了可靠的技术参数.

The deformation characteristics of salty soil affected by numerous and complex environment as a class of special engineering geological body. Through indoor variable head permeability test and standard consolidation test by used of sulphate salty soil along Zheng Xu high-speed rail Lankao south railway station, the variation of permeability coefficient and compression coefficient of sulphate saline soil were researched at different salinity. Research results showed that permeability coefficient of sulphate saline soil decreases with salinity increasing at the same water content, permeability coefficient when dry density was 1.75g/cm^3 and salinity was 5%; The permeability coefficient of different water content sulphate saline soil almost unchanged at the same salinity; The compression coefficient when dry density was 1.75g/cm^3 and water content was 21%, and decreased first with salinity increasing, and then achieved the minimum value in the 5% salinity, after that, a slight increase. It simultaneously provides reliable technical parameters for the design and construction of the Zheng-Xu railway embankment.