南华大学学报（自然科学版）2024，Vol.38Issue(6)：46-53,77,9.DOI:10.19431/j.cnki.1673-0062.2024.06.006
脲酶抑制剂对微生物改良红黏土收缩特性的影响
Effect of Urease Inhibitors on Shrinkage Properties of Microbial Modified Red Clay
摘要
Abstract
In this experiment,the effects of urease inhibitor N-(N-butyl)thiophosphoric triamid(NBPT)with different content on the shrinkage properties of red clay improved by MICP(microbial induced carbonate precipitation)grouting were analyzed.The microstruc-ture characteristics of the samples were observed by CaCO3 content determination,XRD diffraction and SEM electron microscope scanning test.The mechanism of NBPT on the shrinkage properties of MICP improved red clay was comprehensively analyzed.The effect of microorganism on the shrinkage of red clay improved by NBPT was evaluated.The re-sults showed that the shrinkage deformation,initial moisture content and shrinkage system of red clay improved by MICP decreased with the increase of NBPT content.In the residu-al shrinkage deformation stage(δs2),with the increase of NBPT content,the moisture content of the sample reaching the limit linear shrinkage gradually increases,which makes it enter the stable shrinkage deformation stage earlier(δs3).It can effectively delay the overall shrinkage rate of red clay improved by MICP.With the increase of NBPT content,the overall shrinkage deformation decreases,and the overall shrinkage process ends earlier.The total amount of CaCO3 in the sample increased at first and then decreased with the increase of NBPT content.The difference of CaCO3 content between the upper and lower parts decreased gradually with the increase of NBPT content,and finally tended to be stable.Urease inhibitor NBPT can affect the crystal morphology and distribution of the product,and interfere with the morphological transformation of graupel to calcite;the grea-ter the content of NBPT,the stronger the ability of MICP technology to fill small pores in red clay,and the more uniform distribution of CaCO3 thus improving the effect of MICP on the shrinkage properties of red clay.关键词
微生物诱导碳酸钙沉积/脲酶抑制剂/红黏土/收缩性Key words
microbially induced carbonate precipitation/urease inhibitor/red clay/shrinkage分类
建筑与水利引用本文复制引用
欧阳以,彭成,李超..脲酶抑制剂对微生物改良红黏土收缩特性的影响[J].南华大学学报（自然科学版）,2024,38(6):46-53,77,9.基金项目
水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK319008) （YK319008）
