Quantification of chloride saline soil freezing–thawing temperature threshold based on thermodynamic theory

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Chong Wang, Kunyu Li, Jiaqi Tian, Fanshuo Meng, Hao Yang, Junping Ren, Shuangyang Li
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Abstract

The salinity and soil structure are crucial to the freezing and thawing characteristics of soils in saline soil area. Here, we developed a high-precision freeze–thaw temperature model for chloride-salted soils. The temperature threshold for the soil freeze–thaw cycle, which is both physically meaningful and easily measurable and quantifiable, was determined based on experimental observations. Moreover, we examined the relationship between soil freeze–thaw characteristics and the levels of salt content and soil type. Specifically, in the testing of more than 60 soil samples made from different salt contents of sand, silt, and silty clay, the freezing–thawing temperature model shows RMSE = 0.5 K and MPAE = 0.16%. The maximum/minimum value of the soil temperature curve slope can be used to determine the starting and ending temperatures of freeze–thaw cycles, which represents the release rate of phase change latent heat from the side. Sand exhibits greater sensitivity to salt content in terms of freeze–thaw properties. When the salt content > 0.4%, the minimum supercooling point, maximum superheating point and equilibrium freeze–thaw point of sand are lower than those of silty clay. However, the freezing end point and melting starting point consistently conform to the sequence “sand > silt > silty clay”, which is due to their reliance on the bound water content and its bound strength. We provide a comprehensive analysis of the freezing–thawing properties of saline soils. These findings provide valuable guidance for establishing temperature boundary conditions in numerical simulations for cold zone engineering purposes.

基于热力学理论的氯化物盐渍土冻融温度阈值定量分析
盐渍土区土壤的冻融特性受盐渍土的盐度和土壤结构的影响。在此基础上,建立了氯化物盐渍土的高精度冻融温度模型。土壤冻融循环的温度阈值既具有物理意义,又易于测量和量化,是在实验观测基础上确定的。此外,我们还研究了土壤冻融特性与含盐量和土壤类型的关系。具体而言,在60多个不同含盐量的砂、粉、粉质粘土土样的测试中,冻融温度模型RMSE = 0.5 K, MPAE = 0.16%。土壤温度曲线斜率的最大值/最小值可以确定冻融循环的开始温度和结束温度,代表相变潜热从侧面释放的速率。就冻融特性而言,砂对含盐量表现出更大的敏感性。当含盐量>; 0.4%时,砂土的最小过冷点、最大过热点和平衡冻融点均低于粉质粘土。而冻结终点和融化起点始终符合“砂>;粉>;粉质粘土”的顺序,这是由于它们依赖于结合水的含量和结合水的强度。我们对盐渍土的冻融特性进行了全面的分析。这些研究结果为寒区工程数值模拟中温度边界条件的建立提供了有价值的指导。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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