粗粒硫酸盐渍土冻融循环盐胀性研究  

Research on Freeze-thaw Cycle Expansion of Coarse Grained Acid Salt Saline Soil

作　　者：董晓明[1] 谢永利[1] Aaron Daniel MWANZA 李天华[2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学建工学院,陕西西安710064

出　　处：《郑州大学学报（工学版）》2011年第2期75-79,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：新疆维吾尔自治区交通厅科技项目(XJG2007-10)

摘　　要：为研究经多次冻融循环后粗粒硫酸盐渍土的盐胀特性及作为路基填料的适用性,采用室内冻融循环试验,在不同含水率、不同温度条件下,对硫酸盐渍土的盐胀性进行分析研究.试验结果表明:硫酸盐渍土的盐胀变形与含水量及温度有重要关系,并且盐胀量随着含水量的增加而增加,而当含水量一旦超过了最佳含水量后,盐胀量呈减少趋势;当含水率为4.0%的粗颗粒硫酸盐渍土在15～5℃降温区间,结晶比较活跃;当含水率超过最佳含水量时,在15～5℃降温区间土体容易发生塌陷.In order to research on the characteristics and usability of coarse grained acid salt saline soils after a repeated freeze-thaw expansion cycle for use as roadbed fill for road pavements,an interior laboratory test on freeze-thaw expansion cycle was used.Analysis and research of coarse grained acid salt saline soils after a repeated freeze-thaw expansion cycle was done under different conditions of moisture content and temperature.Research results show that： there is an important relationship between the deformation expansion of acid salt saline soils with moisture content and temperature.In addition,as moisture content increases,salt expansion capacity increases up to a single point when moisture content exceeds optimum moisture content,then it starts to reduce.When the moisture content in coarse grained acid salt saline soils is at 4.0% and the low temperature range of the soil is 15～5 ℃,crystallization is active,but as the moisture content exceeds optimum moisture content at the same soil temperature range,the soil mass experiences subsidence.

关 键 词：冻融循环 盐胀 盐渍土 结晶 含水量 

分 类 号：U416.1[交通运输工程—道路与铁道工程]