| 杨玉红,赵文沧,汤德超.寒区硫酸盐渍土盐冻胀试验研究及变形分析[J].甘肃地质,2024,(3):66-71 |
| 寒区硫酸盐渍土盐冻胀试验研究及变形分析 |
| Frost Heave Test and Deformation Analysis of Sulfate Saline Soil in the Cold Regions |
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| DOI： |
| 中文关键词: 硫酸盐渍土 冻胀试验 温度 含盐量 河西地区 甘肃 |
| 英文关键词:sulfate saline soil frost heave test temperature salt content Hexi region |
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| 摘要点击次数: 39 |
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| 中文摘要: |
| 针对寒区硫酸盐渍土的盐冻胀特性开展了室内试验研究。选取甘肃省河西地区硫酸盐渍为原料土，以室内人工制备的硫酸盐渍土为研究对象，就含盐量和含水量对土体盐冻胀变形的影响进行了系列试验研究，并对其变化规律以及产生的机理进行了探讨。本文基于热力学平衡理论，建立了水分冻结过程中的冰盐结晶压力的理论表达式，揭示了硫酸盐渍土盐冻胀变形机理。结果表明：含盐量对土体盐冻胀变形呈现先增大后减小再增大的规律；初始含水量越低，盐晶体的初始结晶温度越高，溶液浓度越接近饱和状态，土体越易发生盐胀破坏；随着硫酸钠含量的增大，冰结晶压力逐渐减小，盐结晶压力不断增大，冰盐结晶压力相互作用导致土体发生膨胀破坏。 |
| 英文摘要: |
| Laboratory experiments were carried out on the salt frost heave characteristics of sulfate saline soil in cold regions. A series of experiments were carried out on the effects of salt content and water content on the frost heave deformation of soil in Hexi area, Gansu Province, and the variation law and mechanism of sulfate saline soil were discussed. Based on the theory of thermodynamic equilibrium, this paper establishes a theoretical expression of the crystallization pressure of ice salt during the freezing process of moisture, and reveals the deformation mechanism of salt heave in sulfate soil. The results show that the salt content increases first, then decreases and then increases to the frost heave deformation of soil. The lower the initial water content, the higher the initial crystallization temperature of the salt crystals, the closer the solution concentration is to the saturated state, and the more likely the soil is to undergo salt expansion failure. With the increase of sodium sulfate content, the ice crystallization pressure gradually decreased, and the salt crystallization pressure increased, and the interaction of ice salt crystallization pressure led to the expansion and destruction of the soil. |
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