硫酸钠溶液和硫酸钠盐渍土的冻结温度及盐晶析出试验研究

万旭升; 赖远明

硫酸钠溶液和硫酸钠盐渍土的冻结温度及盐晶析出试验研究 English Version

中国科学院寒区旱区环境与工程研究所冻土工程国家重点试验室,甘肃兰州 730000

基金项目: 国家自然科学基金项目（41230630）

详细信息

作者简介:
万旭升（1987- ），男，甘肃静宁人，博士研究生，主要从事寒区工程数值模拟与计算。E-mail: xinyanwanxxusheng@163.com。

中图分类号: TU448
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出版历程
- 收稿日期: 2013-03-31
- 发布日期: 2013-11-19

Experimental study on freezing temperature and salt crystal precipitation of sodium sulphate soulotion and sodium sulphate saline soil

State Key Laboratory of Frozen Soil Engineering, Cold and Arid Region Environmental and Engineering Institute, Chinese Academy of Sciences, Lanzhou 730000, China

摘要

摘要: 为了探索硫酸钠盐渍土的盐胀与冻胀机理,对硫酸钠溶液分别在环境温度-20℃和变环境温度-5℃～-10℃下进行降温试验；并对硫酸钠盐渍土在环境温度-20℃下进行降温试验,通过试验研究了硫酸钠溶液和硫酸钠盐渍土中芒硝的析出规律及各自的冻结温度。试验表明：在相同外界环境温度下,浓度大的溶液,芒硝更容易析出；具备一定浓度的溶液,在环境温度变化缓慢条件下更容易析出但溶液的冻结温度的趋势一致；相同浓度硫酸钠盐渍土的冻结温度均低于硫酸钠溶液的冻结温度,随着含盐量增加,其冻结温度降低；在相同外界环境温度下,盐晶在土体中更容易析出。
- 硫酸钠盐溶液 /
- 冻结温度 /
- 盐晶
Abstract: In order to study the mechanism of salt heave and frost heave of sodium sulphate saline soil, the cooling experiments are designed for the sodium sulfate solution at -20℃ environment temperature and in changing temperature ranging from -5℃ to -10℃ and for the sodium sulphate saline soil at -20℃ temperature. It is tried to find the laws of precipitation of mirabilite in the sodium sulfate solution and the sodium sulphate saline soil and their freezing points. The experiments show that at the same environment temperature, a higher concentration of solution leads to an easier precipitation of mirabilite. In the same concentration of solution, a relatively slow environment temperature variation changes precipitation of mirabilite more easily, and the rules of freezing points of the solutions are the same. Compared with that of the sodium sulfate solution, the freezing point of the sodium sulphate saline soil is lower, and at the same environment temperature, salt crystals are more likely to precipitate in the soil.
- sodium sulfate solution /
- freezing point /
- salt crystal

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参考文献(12)

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