Water–salt migration and deformation characteristics in gravelly sulfate saline soil under the effect of localized fine sand accumulation

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-07-08 DOI:10.1016/j.coldregions.2024.104269

Xinyan Ma , Juyuan Cao , Jinbao Han , Shasha Zhang , Yi Zhang , Qian Yu , Miaoxian Yao , Jingyuan Kou

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Abstract

The water-salt migration law and deformation characteristics of coarse-grained saline soils have been extensively studied and illustrated. However, owing to the influence of the chemical composition and physical properties of the soils, coarse-grained soils are prone to localized soil absorption during mixing and compaction. This type of working condition of the existing localized fine sand accumulation layers is seldom discussed in the literature. In this study, water-salt migration and deformation of natural gradation specimens and specimens with localized fine sand accumulation layers in natural gradation were monitored and detected for the field fill conditions in an airport embankment project using self-designed test equipment based on nine freeze–thaw cycle physical simulation tests at environmental temperatures ranging from −30 °C to 25 °C. Under the freeze–thaw cycle, compared with the natural gradation, the specimens with localized fine sand accumulation layers had a higher influence on water and salt migration, which indicates that the depth range of drastic changes in water and salt increased by 80% and 84%, respectively. The cumulative deformation curves under the effects of natural gradation and localized fine sand accumulation exhibited similar trends. The difference between the deformation of the natural samples and samples with localized fine sand accumulation layers was 16% when the salt content of the upper part of the roadbed was 0.3%. In addition, the cumulative vertical settlement deformation of the specimens decreased with an increase in the salt content of the upper part of the roadbed and gradually transformed into vertical uplift deformation. The results of this study provide a basis for the selection of materials for airport roadbed backfill and their application in construction in seasonally frozen areas.

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局部细砂堆积作用下砾石硫酸盐盐土的水盐迁移和变形特征

粗粒盐土的水盐迁移规律和变形特征已得到广泛研究和说明。然而，由于受到土壤化学成分和物理特性的影响，粗粒土在搅拌和压实过程中容易出现局部吸土现象。文献中很少讨论现有局部细砂堆积层的这种工况。本研究使用自行设计的试验设备，在-30 °C至25 °C的环境温度下进行了9次冻融循环物理模拟试验，监测和检测了机场路堤工程现场填土条件下天然级配试件和天然级配局部细砂堆积层试件的水盐迁移和变形。在冻融循环条件下，与自然级配相比，局部有细砂堆积层的试件对水分和盐分迁移的影响更大，这表明水分和盐分急剧变化的深度范围分别增加了 80% 和 84%。自然级配和局部细砂堆积影响下的累积变形曲线表现出相似的趋势。当路基上部含盐量为 0.3% 时，天然样地与局部细砂堆积层样地的变形量相差 16%。此外，随着路基上部含盐量的增加，试样的累积垂直沉降变形也在减小，并逐渐转变为垂直隆起变形。该研究结果为机场路基回填材料的选择及其在季节性冰冻地区施工中的应用提供了依据。

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.