宋宇,刘伟,杨承琨,江嘉辉,陈凯斌,张建伟,郑俊杰

• 1:桂林理工大学土木工程学院
• 2:自然资源部/广西岩溶动力学重点实验室
• 3:中国地质科学院岩溶地质研究所
• 4:河南大学土木工程与建筑学院

摘要(Abstract)：

【目的】探究水泥与石灰对Zn~(2+)污染红黏土固化效果。【方法】以桂林红黏土为研究对象，通过无侧限抗压强度试验、电导率测试、土柱淋滤试验及微观分析，系统研究不同水泥与石灰掺量对污染土的强度特性、导电行为、重金属迁移规律及微观结构的影响。【结果】结果表明，固化剂掺量的增加显著增强了固化效果，其中水泥6%与石灰6%的掺量为最佳比例，固化处理显著提高了Zn~(2+)污染红黏土的无侧限抗压强度，且电阻率与应力-应变呈负相关性。土柱淋滤试验显示，在雨水作用下，Zn~(2+)逐渐向下迁移，导致下部土层污染，浸出浓度随雨水量增加而升高。微观结构分析表明，Zn~(2+)的固定主要源于水泥和石灰水化反应生成的C-S-H凝胶和Ca(OH)_2,这些产物填充土壤孔隙并与Zn~(2+)形成稳定化合物，有效抑制重金属迁移。【结论】水泥与石灰可有效固定Zn~(2+),抑制离子迁移。在桂林地区重金属污染红黏土修复工程中推荐水泥6%+石灰6%配比。研究成果为重金属污染土治理提供了微观机理支撑与工艺参数优化依据。

关键词(KeyWords)： 重金属污染;强度;水泥;石灰;红黏土;力学特性;微观结构

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“活性氧化镁-微生物协同固化重金属污染土宏微观特性演化规律及机理”(42262030);; “广西岩溶动力学重大科技创新基地开放课题“岩溶区重金属污染土离子迁移规律及固化修复机理”(KDL&Guangxi202303);; 河南省科技研发计划联合基金“基于EICP技术的河南省典型重金属污染土修复研究”(225200810005);; 广西岩土力学与工程重点实验室开放课题“纤维-微生物协同固化钙质砂力学特性研究”(桂科岩2023-XT-02)

作者(Author): 宋宇,刘伟,杨承琨,江嘉辉,陈凯斌,张建伟,郑俊杰

DOI: 10.13928/j.cnki.wrahe.2025.09.018

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