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山东大学学报 (工学版) ›› 2026, Vol. 56 ›› Issue (5): 111-123.doi: 10.6040/j.issn.1672-3961.0.2025.032

• 土木工程 • 上一篇    

冻融循环及含盐量对饱和粉土微观特征及剪切特性的影响

吕忠华1,张琦1,陈国龙1,陈榕2*,陈友慧1,王子儒1   

  1. 1. 国网辽宁电力有限公司经济技术研究院, 辽宁 沈阳 110167;2. 东北电力大学建筑工程学院, 吉林 吉林 132012
  • 发布日期:2026-10-19
  • 作者简介:吕忠华(1976— ),男,辽宁铁岭人,高级工程师,主要研究方向为输电线路安全与稳定性分析. E-mail:13840755187@163.com. *通信作者简介:陈榕(1979— ),男,辽宁沈阳人,教授,硕士生导师,博士,主要研究方向为地基处理及输电线路基础承载特性. E-mail:20112384@neepu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(52078108)

The influence of freeze-thaw cycles and salt content on microscopic and shear characteristics of saturated silty soil

Lü Zhonghua1, Zhang Qi1, Chen Guolong1, Chen Rong2*, Chen Youhui1, Wang Ziru1   

  1. Lü Zhonghua1, Zhang Qi1, Chen Guolong1, Chen Rong2*, Chen Youhui1, Wang Ziru1(1. Economic and Technical Research Institute, Liaoning Electric Power Co., Ltd., State Grid Corporation of China, Shenyang 110167, Liaoning, China;
    2. School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, Jilin, China
  • Published:2026-10-19

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摘要： 为分析冻融循环对饱和盐渍土孔隙结构、强度及变形特性的影响,对不同含盐量的饱和粉土试样开展冻融循环试验,并进行核磁共振测试与固结不排水三轴试验。结果表明,冻融循环损伤饱和土体结构导致中、大孔隙生成,而固结令其压密效果更好,对结构损伤有一定修复作用;经历6次“损伤-修复”循环后,饱和土体强度略有降低,其模量在1次冻融循环后即显著下降;含盐量对土体孔隙分布具有显著影响,阳离子影响土体双电层,促进大孔隙生成,同时增强固结效果;在盐致结构损伤与固结修复双重作用下,含盐土体强度随着含盐量增加而降低,且在较高应力时尤为明显;而冻融循环可使盐分胶结起到修复作用,经历1次冻融循环后含盐土体强度提升。本研究可为季冻区沟渠护坡、岸边工程及低渗透性地基中基础稳定性分析参数确定提供依据。

关键词: 冻融循环, 含盐量, 饱和粉土, 力学特性, 微观特征

Abstract: To investigate the effects of freeze-thaw cycles on the micro pore distribution, the strength and modulus of saturated soil, freeze-thaw cycles were applied to saturated silt samples with different salt contents, followed by nuclear magnetic resonance testing and consolidated undrained triaxial tests. The results showed that freeze-thaw cycles damaged the structure of saturated soil, leading to the formation of medium and large pores. However, the compaction effect was improved and the damage was partially repaired by consolidation. After six cycles of "damage-repair", the strength of the saturated soil decreased slightly, while the modulus decreased significantly after one freeze-thaw cycle. Salt content had a significant impact on the pore size distribution of the soil; cations influenced the electrical double layer, resulting in the formation of large pores, but also improved consolidation. Under the combined effects of salt-induced structural damage and consolidation repair, the strength of saline soil decreased with increasing salt content, with a more pronounced decrease under higher stress levels. Freeze-thaw cycles caused salt cementation, which played a role in repairing damage; one freeze-thaw cycle could increase the strength of saline soil. This study could provide a basis for determining stability analysis parameters for ditch slope protection, shore engineering, and low-permeability foundations in seasonally frozen regions.

Key words: freeze-thaw cycles, salt content, saturated silt, mechanical properties, microscopic characteristics

中图分类号: 

  • TU432
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