Abstract Salt expansion deformation is the main engineering hazard of saline soil, which restricts the application of coarse-grained sulfate or sulfite soil as roadbed filling. The main factors affecting salt expansion deformation are change of salt, water and temperature. The principal research objectives of this paper is to offer a basic data reference for the structural design of coarse-grained sulfate saline soil roadbed. To investigate the deformation properties of coarse-grained sulfate saline soil under the freeze-thaw-precipitation cycles, the large-scale sample experiments under the freeze-thaw-precipitation cycles and the freeze-thaw cycles were carried out with self-designed experiment equipment. The results showed that under the same freeze-thaw-precipitation cycles experiment conditions, the minimum temperatures of these samples with 1.5% and 3.0% soluble salt contents at a depth of 20 cm were 3.32 °C and 3.56 °C, respectively. In addition, it took less time for the lower salt content (1.5%) sample to reach the same low temperature compared to the higher salt content sample (3.0%). However, after seven freeze-thaw-precipitation cycles, it was shown that deformation of the sample with 1.5% soluble salt content was 32% higher than that with 3.0% soluble salt content. The maximum deformation amount of the coarse-grained sulfate saline soil after repeated freeze-thaw-precipitation cycles experiment was approximately 1.9–9.4 times larger than that after repeated freeze-thaw cycles experiment, which indicated that precipitation had a serious impact on the deformation of the sample. However, there was almost no difference between the lower salt content and higher salt content samples in the residual deformation caused by the cumulative effect of salt expansion in each cycle. Furthermore, the results showed that under the influence of precipitation, a high-level soluble salt content did not necessarily promote expansion deformation of coarse-grained sulfate soil. Water, salt, and temperature have complex coupling effects.

中文翻译：

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冻融-沉淀循环下粗粒硫酸盐盐渍土的变形特性

摘要 盐胀变形是盐渍土的主要工程危害，制约了粗粒硫酸盐土或亚硫酸盐土作为路基填料的应用。影响盐膨胀变形的主要因素是盐、水和温度的变化。本文的主要研究目的是为粗粒硫酸盐盐渍土路基结构设计提供基础数据参考。为研究冻融-沉淀循环作用下粗粒硫酸盐盐渍土的变形特性，利用自行设计的实验设备进行了冻融-沉淀循环和冻融循环下的大样本试验。 . 结果表明，在相同的冻融-沉淀循环实验条件下，这些含 1.5% 和 3.0% 可溶性盐含量的样品在 20 cm 深度处的最低温度分别为 3.32 °C 和 3.56 °C。此外，与含盐量较高的样品 (3.0%) 相比，含盐量较低的样品 (1.5%) 达到相同低温所需的时间更短。然而，经过七个冻融沉淀循环后，结果表明，可溶性盐含量为 1.5% 的样品的变形比可溶性盐含量为 3.0% 的样品变形高 32%。粗粒硫酸盐盐渍土经过反复冻融-沉淀循环试验后的最大变形量约为反复冻融循环试验后的1.9~9.4倍，说明降水对盐渍土的变形有严重影响。样品。然而，低含盐量样品和高含盐量样品在每个循环中盐膨胀累积效应引起的残余变形几乎没有差异。此外，结果表明，在降水的影响下，高水平的可溶性盐含量并不一定会促进粗粒硫酸盐土的膨胀变形。水、盐和温度具有复杂的耦合效应。