高速公路盐渍土地基溶陷特性离心模型试验  

Centrifugalize model test on dissolve collapse of saline soil under expressway

作　　者：杨晓华[1] 张志萍[1,2] 张莎莎[1] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]中国公路工程咨询集团,北京100097

出　　处：《长安大学学报（自然科学版）》2010年第2期5-9,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200331879750)

摘　　要：为了研究盐渍土地基的溶陷特点,采用室内模拟潜蚀溶陷变形的离心模型试验方法,在最佳含水率条件下,向典型天然盐渍土中添加不同含量的氯化钠盐,研究典型天然盐渍土和不同氯离子含量的盐渍土溶陷系数的特点,以及在相同氯离子含盐量条件下不同温度对于盐渍土溶陷系数的影响。试验结果表明:向典型天然盐渍土中添加氯离子的含量(质量分数)由3.48%增加到5.31%时,其对应的最大溶陷率分别为0.83%、1.65%;当氯离子含量增加到9.59%时,其对应的最大溶陷率达到1.58%,溶陷系数呈现先增大后减小的规律;温度对氯盐引起的盐渍土溶陷特性影响甚微;浓度与时间关系曲线、浓度与滤液关系曲线均符合幂函数。In order to study the collapsibility features of saline soil, under the optimum moisture content condition, the different content sodium chloride is added into the natural saline soil. Through the centrifugalize model test inside, the influence of different content chloride ion and under the same chloride ion salt content the different temperature to the coefficient of salty soil are researched. The research indicated that along with the added chloride ion mass ration is： 3.48%, 5.31% and 9.59%, the coefficient of dissolves to sink at first increases to 0.83% and 1.65~, then reduces to 1.58%. The influence of temperature on the coefficient of the dissolves to sink of salty soil caused by chlorine is little. The concentration and time curve, the relationship between concentration and filtrate are in line with the power function curve. 5 tabs, 8 figs, 10 refs.

关 键 词：道路工程 天然盐渍土 溶陷系数 离心模型试验 氯离子 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU448[建筑科学—岩土工程]