Pore ice evolution and its mechanical influence in a freezing saline sandy soil

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-07-19 DOI:10.1016/j.coldregions.2025.104611

Xiangbo Gao , Yifan Wang , Zhaohao Wu , Rongtao Yan , Pan Chen , Liang Lei

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引用次数: 0

Abstract

Frozen saline sandy soils are widespread in coastal region or riverbank and river delta but rarely studied in the evolution of ice during freezing. This study uses Ottawa sand mixed with a saline solution for in-situ freezing tests and real-time imaging through X-ray CT. Results indicate that ice prefers to form in water-rich pores independent of pore size in coarse-grained soils with large pores. The Logistic model can describe the growth of pore ice, and the growth rate is fastest when the ice content reaches half its maximum. Higher salt-water mass ratio inhibits the pore ice isotropic growth and promotes the anisotropy in ice orientation. Regarding morphology, pore ice tends to evolve from an isotropic compact shape to an anisotropic elongated or bladed shape. Further analysis of sand skeleton deformation reveals that the deformation would diminish as freezing proceeds in unsaturated specimens, while saturated specimen accumulates vertical compressive deformation during freezing. These findings help to understand the evolution of pore ice and potential mechanical behaviors in the freezing of saline sandy soils.

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冻融盐渍沙土孔隙冰演化及其力学影响

冰冻盐渍沙土广泛存在于沿海地区、河岸和三角洲地区，但对冰冻过程中冰的演变研究很少。本研究使用渥太华砂混合盐水溶液进行原位冷冻试验，并通过x射线CT进行实时成像。结果表明，在孔隙较大的粗粒土中，冰倾向于在不受孔隙大小影响的富水孔隙中形成。Logistic模型可以较好地描述孔隙冰的生长，当含冰量达到最大值的一半时，孔隙冰的生长速度最快。较高的盐-水质量比抑制了孔隙冰的各向同性生长，促进了冰取向的各向异性。在形态上，孔隙冰由各向同性致密型向各向异性细长型或叶片型演化。进一步分析表明，非饱和试件随着冻结的进行，变形会逐渐减小，而饱和试件在冻结过程中会积累垂直压缩变形。这些发现有助于理解孔隙冰的演化和盐渍沙土冻结过程中潜在的力学行为。

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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.