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天然粗颗粒盐渍土多次冻融循环盐胀试验

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Keywords: 道路工程,天然粗颗粒盐渍土,冻融循环试验,盐胀,溶陷

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Abstract:

?为了给在粗颗粒盐渍土地区修筑高等级公路提供技术参考,通过对312国道主干线嘉峪关至安西段一级公路沿线的天然粗颗粒盐渍土进行室内基本工程性质分析,选取有代表性的天然粗颗粒盐渍土,分别进行室内模拟季节交替和昼夜温差变化的多次冻融循环试验及有无附加荷载时的单次降温盐胀试验研究,从不同角度对天然粗颗粒盐渍土进行盐胀规律分析。结果表明:天然粗颗粒氯化物硫酸盐渍土在多次冻融循环时具有明显的体缩现象;上覆附加荷载对粗颗粒氯化物硫酸盐渍土盐胀的抑制作用可以达到80%以上;多次冻融循环后的水分、盐分在土柱剖面中的迁移呈现出不完全对应的关系。

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