工程地质学报2025，Vol.33Issue(3)：886-897,12.DOI:10.13544/j.cnki.jeg.2023-0450
海水侵蚀环境下固化淤泥土氯离子扩散规律及微观机理研究
STUDY ON THE LAW AND MICROSCOPIC MECHANISM OF CHLORIDE ION DIFFUSION IN SOLIDIFIED SILT SOIL UNDER SEAWATER EROSION ENVIRONMENT
摘要
Abstract
To study the solidification and improvement of silty clay in marine engineering under the environment of seawater erosion,different curing agents were used to solidify marine silt soil for indoor curing tests.For solidified soil of different proportions:cement-solidified soil(CS),steel slag powder-cement-solidified soil(SSP-CS),activa-tor-steel slag powder-cement-solidified soil(A-SSP-CS),and slag powder-cement-solidified soil(SP-CS)were studied to analyze their physical and mechanical properties,the diffusion and distribution of erosion ions in solidi-fied soil,and the changes of microstructure after erosion.The results show that the mass change rate of the samples cured by different curing agents fluctuates greatly with the increase of erosion time,and all of them show a trend of decreasing first and then increasing.After 90 days of erosion,the strength of each type of solidified soil reached the maximum value,and the strength of the SP-CS solidified soil sample was always much higher than that of other so-lidified soil samples from the initial stage.The comparison between SSP-CS and A-SSP-CS solidified soil samples shows that the internal compactness of A-SSP-CS solidified soil samples is reduced due to excessive activator NaOH,which results in a trend of decreasing strength.The transport and diffusion law of chloride ions shows that their content keeps increasing with the depth and age of erosion,the curve fluctuates greatly and steadily rises in the later period.The contrast of chloride ion concentration in the sample is:SP-CS＞CS＞SSP-CS＞A-SSP-CS;In the SP-CS and SSP-CS solidified soil samples,hydration products such as C-S-H gelling and ATT acicular sub-stances appear after seawater erosion,and the internal pores are small and closely arranged.The research results show that slag powder can replace cement to solidify silt soil feasibility,and can provide a theoretical basis for the study of the erosion resistance of solidified soil in practical engineering.关键词
固化淤泥土/海水侵蚀/质量变化率/无侧限抗压强度/氯离子扩散Key words
Solidified silt soil/Seawater erosion/Mass change rate/Unconfined compressive strength/Chloride ion diffusion分类
天文与地球科学引用本文复制引用
吴燕开,浮朝晖,李文艳,许振翔,王粱..海水侵蚀环境下固化淤泥土氯离子扩散规律及微观机理研究[J].工程地质学报,2025,33(3):886-897,12.基金项目
山东省自然科学基金项目(资助号:ZR2022MD061).This research is supported by Nature Science Foundation of Shandong Province(Grant No.ZR2022MD061). （资助号:ZR2022MD061）
