首页|冻融循环作用下MICP固化铅污染土的强度与浸出特性研究

冻融循环作用下MICP固化铅污染土的强度与浸出特性研究

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微生物诱导碳酸钙沉淀(MICP)技术可用于重金属污染土固化稳定修复.本文通过开展无侧限抗压强度、离子浸出及微观试验,主要研究MICP固化铅污染土在冻融循环作用下的强度与化学稳定性,并揭示其微观作用机理.结果表明:随着铅离子浓度的增加,土体的无侧限抗压强度先增大后减小,铅离子浸出浓度增大;随冻融循环次数的增加,土体的强度逐渐降低并趋于稳定,铅离子浸出浓度增大.冻融循环作用后,固化土的主要矿物成分未发生变化;土中的小孔隙数量增加,大孔隙数量基本保持不变.冻融循环作用损伤固化土的碳酸钙胶结与铅离子沉淀结构,致使土体性能劣化.
STRENGTH AND LEACHING CHARACTERISTICS OF MICP-SOLIDIFIED LEAD-CONTAMINATED SOILS UNDER THE ACTION OF FREEZE-THAW CYCLES
Microbially Induced Calcite Precipitation(MICP)technology can be used to solidify and stabilize heavy metal contaminated soil.This paper mainly studies the strength and chemical stability of MICP-solidified lead-con-taminated soils under freeze-thaw cycles through unconfined compressive strength,ion leaching,and microscopic tests,and reveals its microscopic mechanism.The results show that with the increase in lead ion concentration,the unconfined compressive strength of the soil increases first and then decreases,and the lead ion leaching concentra-tion increases.With the increase in freeze-thaw cycles,the strength of the soil decreases and tends to be stable,and the lead ion leaching concentration increases.After the freeze-thaw cycle,the main mineral components of so-lidified soil do not change;the number of small pores in the soil increases,and the number of large pores remains basically unchanged.Freeze-thaw cycles damage the calcium carbonate cementation and lead ion precipitation struc-ture of solidified soil,resulting in the deterioration of soil properties.

Heavy metal contaminated soilMicrobially Induced Calcite Precipitation(MICP)Freeze-thaw cy-cleStrength and leaching characteristicsDeterioration mechanism

李杰、康博、查甫生

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合肥工业大学资源与环境工程学院,合肥 230000,中国

重金属污染土 微生物诱导碳酸钙沉淀(MICP) 冻融循环 强度及浸出特性 劣化机理

国家自然科学基金项目国家自然科学基金项目安徽省自然科学基金项目中央高校基本科研业务费专项

4187726242030710190885QD168PA2021 KCPY0055

2024

10.13544/j.cnki.jeg.2021-0811

工程地质学报
中国科学院地质与地球物理研究所

工程地质学报

CSTPCD北大核心
影响因子：1.215
ISSN：1004-9665
年,卷(期)：2024.32(2)
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