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Investigation of freeze-thaw damage mechanism of dispersed saline soils considering water-salt transport(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年2期
Page:
1-11
Research Field:
道路工程
Publishing date:

Info

Title:
Investigation of freeze-thaw damage mechanism of dispersed saline soils considering water-salt transport
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)
Keywords:
road engineering;  water-salt transport;  numerical modeling;  saline soil;  freeze-thaw cycle
PACS:
U419.92
DOI:
10.19721/j.cnki.1671-8879.2024.02.001
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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Last Update: 2024-03-01