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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3151-3162.DOI: 10.16552/j.cnki.issn1001-1625.2026.0212

• 资源综合利用 • 上一篇    下一篇

石灰-粉煤灰固化盐渍土的力学性能及微观特征研究

陈飞1(), 赵翃婷1(), 武小鹏2,3, 栗晓林2,3,4, 王飞4   

  1. 1.嘉兴南湖学院建筑工程学院,嘉兴 314001
    2.嘉兴大学建筑工程学院,嘉兴 314001
    3.嘉兴大学G60科创走廊产业与创新研究院,嘉兴 314001
    4.中国科学院西北生态环境资源研究院,冰冻圈科学与冻土工程全国重点实验室,兰州 730000
  • 收稿日期:2026-03-09 修订日期:2026-04-28 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 赵翃婷,博士,讲师。E-mail:zhaohongting@lzb.ac.cn
  • 作者简介:陈飞(1983—),女,讲师。主要从事道路与桥梁工程方面的研究。E-mail:chenfei@jxnhu.edu.cn
  • 基金资助:
    嘉兴市青年人才专项项目(2024AY40020);嘉兴市青年人才专项项目(2024AY40036);嘉兴市社会发展专项项目(2025BS001)

Mechanical Properties and Microscopic Characteristics of Lime-Fly Ash-Solidified Saline Soil

CHEN Fei1(), ZHAO Hongting1(), WU Xiaopeng2,3, LI Xiaolin2,3,4, WAMG Fei4   

  1. 1.School of Civil Engineering and Architecture,Jiaxing Nanhu University,Jiaxing 314001,China
    2.College of Civil Engineering and Architecture,Jiaxing University,Jiaxing 314001,China
    3.G60 STI Valley Industry and Innovation Institute,Jiaxing University,Jiaxing 314001,China
    4.State Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment;and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2026-03-09 Revised:2026-04-28 Published:2026-09-15 Online:2026-10-09

摘要:

本文通过无侧限压缩试验和直剪试验研究了石灰-粉煤灰固化杭州湾地区盐渍土的力学性能,分析了含盐量和养护龄期对石灰、粉煤灰固化效果的影响规律,并结合扫描电子显微镜(SEM)和压汞法孔隙率测试(MIP)揭示了石灰-粉煤灰固化盐渍土(二灰土)的微观结构特征。结果表明,盐渍土的无侧限抗压强度、切线模量、应变比能均随含盐量的增加呈先增大后减小的变化趋势,认为含盐量对盐渍土力学性能的影响存在最优掺量;掺入石灰、粉煤灰后,二灰土的力学性能大幅提升,基本上随含盐量和养护龄期的增加而增强,但含盐量超过1%(质量分数)后,无法进一步显著提升二灰土的力学性能。基于微观试验结果,发现石灰、粉煤灰能够有效地改善盐渍土的孔隙结构特征,二灰土的孔容积、中值孔径、平均孔径、孔隙率、分形维数等参数均小于盐渍土,土体堆积密度由1.41 g/cm3增加到1.47 g/cm3,这些参数能够更好地揭示二灰土微观结构特征和宏观力学性能之间的关系。研究成果可为二灰土在杭州湾地区实际工程中的应用提供科学参考。

关键词: 石灰, 粉煤灰, 盐渍土, 含盐量, 养护龄期, 力学性能, 微观结构特征

Abstract:

To investigate the mechanical properties of lime-fly ash-solidified saline soil in the Hangzhou Bay area, this study conducted unconfined compression tests and direct shear tests, the influences of salt content and curing age on the solidification effect of lime and fly ash were analyzed. Furthermore, the scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests were employed to reveal the microstructural characteristics of lime-fly ash-solidified saline soil (lime-fly ash soil). The results show that the unconfined compressive strength, tangent modulus, and strain energy density of saline soil all initially increase and then decrease with the rise of salt content. Therefore, it can be inferred that there exists an optimal salt content regarding the influence of salt content on the mechanical properties of saline soil. The mechanical properties of lime-fly ash soil are significantly improved after the incorporation of lime and fly ash. They generally increase with rising salt content and curing age, however, a salt content exceeding 1% (mass fraction) does not lead to a further significant enhancement of these properties. Based on the microscopic test results, it is found that lime and fly ash can effectively improve the pore structure characteristics of saline soil. The pore volume, median pore diameter, average pore diameter, porosity, and fractal dimension of lime-fly ash soil are all lower than those of saline soil, and the bulk density of soil increases from 1.41 g/cm3 to 1.47 g/cm3. These parameters provide a better understanding of the relationship between the microstructural characteristics and macroscopic mechanical properties of lime-fly ash soil. The research results can provide a scientific reference for the application of lime-fly ash soil in practical engineering in the Hangzhou Bay area.

Key words: lime, fly ash, saline soil, salt content, curing age, mechanical property, microstructural characteristics

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