摘要
微生物诱导碳酸钙沉淀(MICP)是一种复杂的微生物化学过程,其中沉淀量、沉淀速率以及胶结沉淀的结晶形式受多种因素影响,除了外界环境、材料特性和加固方式等因素外,胶结液浓度、养护时长等对微生物加固土体也起着决定性的作用。以黄土为研究对象,采用拌合的方法对重塑黄土进行加固,研究不同胶结浓度和养护天数对微生物固化黄土的影响。通过试验发现,微生物固化黄土具有可行性。胶结液会影响微生物固化黄土试样的强度,胶结液浓度为1 mol/L时的试样强度高于其他浓度胶结液,微生物固化黄土试样的无侧限抗压强度随着碳酸钙沉积效率的增加而增大。最后通过分析养护天数对微生物固化黄土的强度影响,得到养护时长为14 d~28 d下试样的加固效果更好。分析结果可为微生物诱导碳酸钙沉淀加固黄土提供试验性的参考。
Microbe-induced calcium carbonate precipitation(MICP)is a complex microbial chemical process.Among them,the amount of precipitation,precipitation rate and crystallization form of cemented precipitation are affected by many factors.In addition to factors such as the external environment,material properties,and reinforcement methods,the concentration of cementing fluid and the duration of curing also play a decisive role in the soil reinforcement by microorganisms.Taking loess as the research object,the method of mixing is used to reinforce the remolded loess,and the influence of different cementation concentrations and curing days on the microbial solidified loess is studied.Through experiments,it is found that microbial immobilization of loess is feasible.The cementing fluid will affect the strength of the microbial solidified loess sample.The strength of the sample when the concentration of cementing fluid is 1mol/L is higher than that of cementing fluid with other concentrations.The unconfined compressive strength of microbially solidified loess samples increases with the increase of calcium carbonate deposition efficiency.Finally,by analyzing the effect of curing days on the strength of microbially solidified loess,it is obtained that the reinforcement effect of the sample is better when the curing time is 14 d~28 d.The analysis results can provide experimental reference for microorganism-induced calcium carbonate precipitation to strengthen loess.
作者
谈刘鑫
苏岩
赵力
耿芳杰
陈阳
张昕
Tan Liuxin;Su Yan;Zhao Li;Geng Fangjie;Chen Yang;Zhang Xin(Xi'an University of Technology,Xi'an 710048,Shaanxi;Hanjiang to Water Valley Water Diversion Project Construction Co.,Ltd.,Shaanxi Province,Xi'an 710024,Shaanxi)
出处
《陕西水利》
2023年第5期1-3,6,共4页
Shaanxi Water Resources
基金
陕西省自然科学基础研究计划项目(2021JM-601)
陕西省引汉济渭工程建设有限公司科技创新基金支持项目(HJW-D-79-5)。
关键词
MICP
胶结液浓度
无侧限抗压强度
养护天数
碳酸钙沉积
MICP
cementing fluid concentration
unconfined compressive strength
curing days
calcium carbonate deposition
