1. 中国地震局兰州地震研究所
2. 中国地震局(甘肃省)黄土地震工程重点实验室
纸质出版:2025
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郭梅, 韩昕, 卢育霞, 等. 镉污染对黄土物理化学及力学性质的影响[J]. 地质科技通报, 2025,44(3):353-362.
郭梅, 韩昕, 卢育霞, et al. 镉污染对黄土物理化学及力学性质的影响[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 353-362.
郭梅, 韩昕, 卢育霞, 等. 镉污染对黄土物理化学及力学性质的影响[J]. 地质科技通报, 2025,44(3):353-362. DOI: 10.19509/j.cnki.dzkq.tb20240355.
郭梅, 韩昕, 卢育霞, et al. 镉污染对黄土物理化学及力学性质的影响[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 353-362. DOI: 10.19509/j.cnki.dzkq.tb20240355.
土壤重金属污染已经成为许多国家面临的严重问题,镉污染是影响中国土壤环境质量的首要重金属污染之一。为研究镉污染对黄土力学性质与物理化学性质的影响,对不同镉离子质量分数的重塑黄土进行了压缩、直接剪切、击实、渗透、酸碱度与粒度分析试验,并通过扫描电镜(scanning electron microscope,简称SEM)观察了受到镉污染后黄土微观结构的变化。结果表明:Cd
2+
质量分数高于300 mg/kg时,黄土pH值随w(Cd
2+
)的增加明显降低,渗透性随w(Cd
2+
)增加先增大后减小,镉污染对黄土粒径分布影响不明显;随着Cd
2+
质量分数的增加,黄土压缩性增大,黏聚力减小,内摩擦角和抗剪强度均先增大后减小,最大干密度增大,最佳含水率降低;w(Cd
2+
)为30 mg/kg的镉污染黄土孔隙度比未污染黄土大,中孔隙占比比未污染黄土高,而w(Cd
2+
)为3 000 mg/kg的镉污染黄土孔隙度比未污染黄土小,中孔隙占比比未污染黄土低,小孔隙占比比未污染黄土高。镉污染引起黄土物理化学性质、力学性质与微观结构的改变,主要原因在于孔隙水中硝酸镉的水解反应、Cd
2+
在黄土颗粒上的化学吸附反应、以及加入Cd
2+
后黄土颗粒双电层厚度的压缩。研究成果可为黄土地区镉污染场地工程性质评估和灾害防控提供参考依据。
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