天然盐渍土冷端阶梯式持续降温盐-冻胀及水盐迁移试验研究
发布时间:2018-01-03 11:03
本文关键词:天然盐渍土冷端阶梯式持续降温盐-冻胀及水盐迁移试验研究 出处:《科学技术与工程》2016年31期 论文类型:期刊论文
更多相关文章: 天然盐渍土 冷端持续降温 盐-冻胀 起胀温度 水盐迁移
【摘要】:为研究罗布泊地区天然盐渍土中盐-冻胀规律和盐胀机制,选取罗布泊含砂低液限粉土在自动化大尺寸可控温度循环仪中冷端阶梯式持续降温,进行盐-冻胀试验。结果表明,该土为含砂低液限粉土,在土体温度为5~0℃时,发生明显土体膨胀,此温度区间为该土类盐胀起胀温度区;冷端持续降温过程土体膨胀变形可分为3个阶段,第一阶段为盐胀起胀阶段,第二阶段为盐胀增长阶段,第三阶段为盐-冻胀共同增长阶段;水分与盐分从暖端向冷端迁移,其中氯离子与水分迁移具有一定共性,而硫酸根离子与二者不同。
[Abstract]:As a natural saline soil salt - Research of Lop Nor area law of frost heave and salt expansion mechanism, selection of Lop Nor silt in the automatic size controlled temperature cycle in the cold end of the ladder continued to cool, salt - Frost Heaving test. The results showed that the soil is silt, soil temperature 5~0 C, obvious soil swelling, the temperature range of the soil salt heaving temperature; cold end continuous cooling process of the expansive deformation can be divided into 3 stages, the first stage is the salt heaving stage, second stages of growth for the salt expansion stage, third stages of common growth of salt frost heaving stage; water and salt migration from the warm end to the cold end, the chloride ion and water migration has some similarities, and sulfate ions and two different.
【作者单位】: 新疆农业大学水利与土木工程学院;
【基金】:国家自然科学基金(41262012) 新疆水文学及水资源重点学科基金(xjswszyzdxk20101202)资助
【分类号】:TU448
【正文快照】: 和新疆水文学及水资源重点学科基金(xjswszyzdxk20101202)资助盐渍土与非盐渍土相比具有独特的三相性,土体中的易溶盐会因外部环境的变化在固相与液相之间转换[1]。这种土质特性使得盐渍土地区易发生盐胀、溶陷、腐蚀和翻浆等工程病害。盐渍土的矿物成分、颗粒形状及排列方式,
本文编号:1373593
本文链接:https://www.wllwen.com/jingjilunwen/jianzhujingjilunwen/1373593.html