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ORIGINAL RESEARCH article
Front. Mater.
Sec. Mechanics of Materials
Volume 12 - 2025 | doi: 10.3389/fmats.2025.1583278
Experimental study of urea-catalyzed microbial solutionbased curing of fissured loess soil
Provisionally accepted- 1Nanjing Hydraulic Research Institute, Nanjing, China
- 2Nanjing Tech University, Nanjing, Jiangsu Province, China
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The ubiquitous vertical cracks in loess area are one of the main factors that cause disasters to the project, and the restoration of cracked loess is of great significance to prevent disasters. Microbial-induced calcium carbonate precipitation (MICP), as a green solidification method, is widely used in soil remediation. The microstructure changes of crack-free loess after solidification were analyzed by scanning electron microscope, and the optimal grouting scheme of microbial solution catalyzed by urea was determined. Solidification tests were carried out on fractured loess with different openings, and the solidification effect of MICP was evaluated by direct shear test. The results show that the surface contact between micro-aggregates and the contact area between soil particles increase greatly after MICP curing. Under the catalysis of urea, the amount of CaCO3 increased by 30%, which enhanced the strength of the soil on both sides of the fractured loess structural plane after solidification.
Keywords: MICP, Fissured loess, CaCO3 production, straight shear test, Microanalysis
Received: 25 Feb 2025; Accepted: 15 Apr 2025.
Copyright: © 2025 Pan, Zhang and Ji. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Chen Zhang, Nanjing Hydraulic Research Institute, Nanjing, China
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