[1]孔元元,梁晨涛,王智慧,等.考虑水盐运移的分散性盐渍土冻融破坏机制[J].长安大学学报(自然科学版),2024,44(2):1-11.[doi:10.19721/j.cnki.1671-8879.2024.02.001]
　KONG Yuan-yuan,LIANG Chen-tao,WANG Zhi-hui,et al.Investigation of freeze-thaw damage mechanism of dispersed saline soils considering water-salt transport[J].Journal of Chang’an University (Natural Science Edition),2024,44(2):1-11.[doi:10.19721/j.cnki.1671-8879.2024.02.001]
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考虑水盐运移的分散性盐渍土冻融破坏机制()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第44卷
期数:
2024年2期
页码:
1-11
栏目:
道路工程
出版日期:
2024-03-01

文章信息/Info

Title:
Investigation of freeze-thaw damage mechanism of dispersed saline soils considering water-salt transport
文章编号:
1671-8879(2024)02-0001-11
作者:
孔元元; 梁晨涛; 王智慧; 谢柏涵; 成忠焱
(长安大学 公路学院,陕西 西安 710064)
Author(s):
KONG Yuan-yuan;  LIANG Chen-tao;  WANG Zhi-hui;  XIE Bo-han;  CHENG Zhong-yan
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
关键词:
道路工程;  水盐运移;  数值模拟;  盐渍土;  冻融循环
Keywords:
road engineering;  water-salt transport;  numerical modeling;  saline soil;  freeze-thaw cycle
分类号:
U419.92
DOI:
10.19721/j.cnki.1671-8879.2024.02.001
文献标志码:
A
摘要:
为探究冻融循环过程中土体冻-盐胀破坏机理,结合冻结温度试验和扫描电子显微镜进行研究,分析了不同循环次数、不同盐的种类和不同含水率条件下的冻融循环对土体结构和性质的影响,得到了不同循环次数下的冻结温度变化曲线和不同含水率条件下冻土的SEM电镜扫描图片,并基于经典传热理论和水盐运移方程,建立数值模型,再现了冻融过程中的水盐运移过程,在此基础上结合试验对水盐运移过程中土体的破坏机制进行分析研究。研究结果表明:由于研究区土体的分散性,其冻结过程只存在恒定阶段和递降阶段,且随着冻融循环次数的增大,土体的冻结温度会先升高然后在某一温度保持稳定,这与冻融循环过程中土体粒度大小和颗粒排布的方式改变相关,内部的微裂隙逐渐贯通; 土体在冻融循环过程所发生的水盐迁移是土体强度和结构发生变化的重要原因,且随着冻融循环过程的进行,土中的水盐成分会在温度梯度和溶质梯度的影响下产生迁移和积累; 相较于碳酸氢钠,硫酸钠在冻融过程中对于土体结构的改变更为显著,具体表现在冻结过程中硫酸钠结晶析出体积变为原来的3.18倍,导致冻融循环后土体膨胀。本研究有助于揭示季节性冻土区含盐冻土工程的冻融破坏机制。
Abstract:
To investigate the freezing-salt expansion damage mechanism of soil during thefreezing and thawing cycle process, freezing temperature tests and scanningelectron microscopy(SEM)were combined to analyze how different numbers of freezing and thawing cycles,types of salts, and water content affect the soil's structure and properties. Freezing temperature change curves under varying cycle times and SEM electron microscopeimages of frozen soil at different water content levels were obtained. Drawing from classical heat transfer theoryand water-salt transport equations, a numerical model was established to simulate water-salttransport during freeze-thaw cycles. On this basis, combined with experimental work, the failure mechanism of soil during water and salt transport process was analyzed and studied. The results show that the freezing process in the study area experiences aconstant and decreasing stage due to soil body dispersion. As the number of freeze-thaw cyclesincreases, the soil body's freezing temperature initially rises and then stabilizes at a certaintemperature. This is related to changes in soil particle size, particle arrangement, and gradualpenetration of internal microcracks during freeze-thaw cycles. The migration of water salts in thesoil during freeze-thaw cycles is the primary factor influencing soil strength. Water-salt migrationoccurs due to temperature and solute gradients, leading to changes in soil strength and structure.Sodium sulfate has a more pronounced impact on soil structure changes during freezing andthawing compared to sodium bicarbonate. Specifically, sodium sulfate crystals expand by avolume of 3.18 times during freeze-thaw cycles, resulting in soil expansion after the cycles, whichalters the soil structure.This research contributes to understanding the freeze-thaw damagemechanism in salt-containing permafrost projects within seasonal permafrost areas.6 tabs, 13 figs, 32 refs.

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备注/Memo

备注/Memo:
收稿日期:2023-10-27
基金项目:国家自然科学基金项目(52208415)
作者简介:孔元元(1987-),女,河北沧州人,讲师,工学博士,E-mail:kongyy@chd.edu.cn。
更新日期/Last Update: 2024-03-01