土工基础

土工基础 ›› 2026, Vol. 40 ›› Issue (3): 552-558.

• 测试技术 • 上一篇    下一篇

碱液（NaOH）污染红黏土的物理力学特性试验研究

龙 钰1，陈 筠2，王连锐3   

  1. (1.贵州大学 资源与环境工程学院，贵阳 550025；2.贵州理工学院，贵阳 550003；3.贵州省水利科学研究院，贵阳 550001）
  • 收稿日期:2024-03-04 修回日期:2024-04-13 出版日期:2026-06-30 发布日期:2026-06-25
  • 通讯作者: 陈筠(1970-)，女，教授，研究方向为区域稳定与岩体稳定、岩溶工程地质、地基与基础工程、边坡工程等。
  • 作者简介:龙钰(1999-)，男，硕士研究生，研究方向为岩土体工程性质与应用。
  • 基金资助:
    贵州省地质灾害监测预警与决策支持平台建设(Z113278)

Experimental Study on the Physical and Mechanical Properties of Red Clay Contaminated with Alkaline Solution (NaOH)

 LONG Yu1, CHEN Yun2, WANG Lianrui3   

  1. (1.School of Resources and Environmental Engineering, Guizhou University, Guiyang 550025;
    2.School of Continuing Education, Guizhou Institute of Technology, Guiyang 550003;
    3.Guizhou Provincial Water Conservancy Research Institute, Guiyang 550001)
  • Received:2024-03-04 Revised:2024-04-13 Online:2026-06-30 Published:2026-06-25
  • About author:

摘要： 为深入研究碱液（NaOH）对红黏土的物理力学特性影响，将原状红黏土浸泡于六种不同浓度的碱液中，养护时间不同。通过测试被碱污染红黏土的物理力学指标，并进行室内模拟试验，得出了物理力学性质与碱液浓度、养护时间的关系。研究结果表明：①碱污染红黏土的物理性质变化主要受碱液（NaOH）浓度影响。随着碱液浓度的增加，干密度降低、比重升高，液限先降后升，塑限先增后减的变化规律。②碱污染红黏土的力学特性具有浓度效应。随着碱液浓度的增加，抗剪强度呈现先降后升再降的变化趋势。养护前，碱液浓度为3.5%时，抗剪强度最低，暗示活性胶结物反应完成，碱液浓度的增加抗剪强度会有所提升，碱液浓度达到21%时，抗剪强度有所降低。养护10 d后，不同浓度碱污染红黏土的抗剪强度均有提升，碱液浓度为14%时，抗剪强度提升最为明显。③被碱污染的红黏土抗剪强度存在最优区间，其中3.5%时最差，而14%时最佳。（4）碱污染红黏土需要一定的养护时间，以促使新的胶结物填充孔隙，增加红黏土的密实度与强度。


关键词: 碱污染, 红黏土, 物理特性, 力学特性

Abstract: To investigate in depth the influence of alkaline solution (NaOH) on the physical and mechanical properties of red clay, undisturbed red clay samples were immersed in six NaOH solutions of different concentrations and cured for varying durations. By testing the physical-mechanical indices of alkali-contaminated red clay and conducting indoor simulation experiments, the relationships among physical-mechanical behavior, alkali concentration, and curing time were established. The main findings are as follows: 1) Physical properties of alkali-contaminated red clay are primarily controlled by NaOH concentration. As concentration increases, dry density decreases, specific gravity increases, the liquid limit decreases then increases, and the plastic limit increases then decreases. 2) The mechanical properties exhibit a clear concentration effect. With increasing NaOH concentration, the shear strength first decreases, then increases, and finally decreases again. Before curing, the shear strength is lowest at 3.5%, indicating completion of reactions involving active cementitious substances. Further increases in concentration lead to strength recovery, but at 21%, shear strength decreases again. After 10 days of curing, shear strength increases across all concentrations, with the most pronounced improvement at 14%. 3) An optimal concentration range exists for shear strength of alkali-contaminated red clay: performance is worst at 3.5% and best at 14%. 4) Alkali-contaminated red clay requires a certain curing period to allow newly formed cementitious products to fill pores, thereby increasing density and strength.

Key words: Alkali Contamination, Red Clay, Physical Properties, Mechanical Properties

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