土木与环境工程学报（中英文）2026，Vol.48Issue(3)：30-40,11.DOI:10.11835/j.issn.2096-6717.2024.078
MICP协同氧化镁固化Zn2+污染红黏土的效果试验研究
Effect of MICP synergized with magnesium oxide on solidification of Zn2+contaminated red clay
摘要
Abstract
As industrialization accelerates,the pollution problem of Zn2+is becoming increasingly severe,posing a significant threat to the stability of ecosystems and engineering structures.To cope with this challenge,this study examines the solidification effect of MICP(Microbially Induced Carbonate Precipitation)synergized with magnesium oxide on Zn2+contaminated red clay.The variation of unconfined compressive strength(UCS)and shear strength index of solidified soil under different concentrations of cementation solution,magnesium oxide contents and Zn2+concentrations were investigated by UCS tests and direct shear tests.The curing effect of MICP synergized with magnesium oxide technology on Zn2+was analyzed by ion occurrence form test and pH value changes of samples before and after curing.The results show that the incorporation of magnesium oxide significantly improves the UCS and shear strength of Zn2+contaminated red clay.When the content of magnesium oxide is 5%,the utilization rate is the highest.When the concentration of cementation solution is 1.0 mol/L,the UCS and shear strength are the highest.The shear strength index of solidified samples is mainly affected by the content of magnesium oxide.The incorporation of magnesium oxide facilitates calcium carbonate precipitation during MICP by increasing the pH value.This process accelerates the transformation of zinc ions from a weak acid-extractable state to reducible,oxidizable,and residual states.关键词
微生物矿化/氧化镁/红黏土/强度特性/微生物诱导碳酸钙沉淀Key words
microbial mineralisation/magnesium oxide/red clay/strength characteristics/microbial induced carbonate precipitation(MICP)分类
建筑与水利引用本文复制引用
宋宇,成继春,陈玉玲,李嘉琦,刘伟..MICP协同氧化镁固化Zn2+污染红黏土的效果试验研究[J].土木与环境工程学报（中英文）,2026,48(3):30-40,11.基金项目
国家自然科学基金(42262030) （42262030）
广西岩溶动力学重大科技创新基地开放课题(KDL&Guangxi202303) （KDL&Guangxi202303）
河南省科技研发计划联合基金(225200810005) （225200810005）
广西岩土力学与工程重点实验室开放课题(桂科岩2023-XT-02) National Natural Science Foundation of China(No.42262030) （桂科岩2023-XT-02）
Guangxi Key Science and Technology Innovation Base on Karst Dynamics(No.KDL&Guangxi202303) （No.KDL&Guangxi202303）
Henan Science and Technology R&D Program Joint Fund(No.225200810005) （No.225200810005）
Open Subjects of Guangxi Key Laboratory of Geotechnical Mechanics and Engineering(No.2023-XT-02) （No.2023-XT-02）
