| 硫酸钠溶液的盐胀与冻胀 |
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| 引用本文： | 邓友生,周成林.硫酸钠溶液的盐胀与冻胀[J].冰川冻土,2009,31(5). |
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| 作者姓名： | 邓友生 周成林 |
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| 作者单位： | 中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金项目(40571068)资助 |
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| 摘 要： | 为探讨硫酸钠盐渍土产生盐胀与冻胀的机理,研究了硫酸钠盐溶液在温度变化时的盐胀和冻胀的特征和规律性.针对不同浓度的硫酸钠盐溶液,在不同温度下的体积变化进行了观测.通过试验,定量分析了不同浓度的硫酸钠盐溶液在温度降低过程中,其盐胀率在一定的温度范围内随温度的变化规律;尤其是在负温区间,不同浓度的硫酸钠盐溶液冻胀率随着温度的变化规律.试验表明,硫酸钠盐溶液的盐胀必须具备一定的浓度条件,否则无结晶盐析出,无盐胀产生,并且低于这个浓度的所有盐溶液随着温度的降低将一直处于冷缩状态,直到冻胀产生.比较了不同浓度溶液的盐水比和结晶盐的盐水比,不同浓度的盐溶液其体积膨胀率(盐胀率与冻胀率之和)不同,硫酸钠盐具有一定的抑制冻胀的作用.
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| 关 键 词： | 硫酸钠盐溶液 温度 盐胀 冻胀 |
Salt Expansion and Frost Heave of Sodium Sulphate Solution |
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| DENG You-sheng,ZHOU Cheng-lin.Salt Expansion and Frost Heave of Sodium Sulphate Solution[J].Journal of Glaciology and Geocryology,2009,31(5). |
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| Authors: | DENG You-sheng ZHOU Cheng-lin |
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| Institution: | State Key Laboratory of Frozen Soil Engineering;Cold and Arid Regions Environmental and Engineering Research Institute;Chinese Academy of Sciences;Lanzhou Gansu730000;China |
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| Abstract: | At different concentrations and temperatures,the characteristics and rules of the salt expansion and frost heave of sodium sulphate solution were studied for revealing their forming mechanism. The relationship between salt heave rate and temperature,especially at the temperatures below freezing point,is analyzed quantificationally based on a lot of experiments. In a certain temperature range,the salt heave rates of different solution concentrations increase gradually with lowering temperature. In the temper... |
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| Keywords: | Sodium sulphate solution temperature salt expansion frost heave |
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