TY - JOUR
T1 - A Revised Porous Media Model of Microbially Induced Carbonate Precipitation for Loess Solidification
AU - Sun, Xiaohao
AU - Moiao, Linchang
AU - Chen, Runfa
AU - Wang, Hengxing
AU - Wu, Linyu
N1 - Funding Information:
The authors thank the valuable comments from the reviewers. This study was funded by National Natural Science Foundation of China (Grant No. 51578147), Fundamental Research Funds for the Central Universities (Grant No. 2242020R20025), Science and Technology Department of Ningxia (Grant No. 2020BFG02014), and Transportation Department of Ningxia (Grant No. 202000173).
Publisher Copyright:
© 2023 American Society of Civil Engineers.
PY - 2023/6/1
Y1 - 2023/6/1
N2 - Similar to sand solidification with microbially induced carbonate precipitation (MICP), the MICP technique can also be used to bond loess particles and improve the collapsibility of loess. However, existing theoretical models related to MICP sand solidification cannot be used to guide the application of loess solidification. Based on the properties of loess, the present study revised the transport model of biomass. The revised biomass transport model enabled the calculation of the biomass distribution. Moreover, considering the effects of nutrients in the cementation solution and the ions of inorganic salts contained in loess on urea hydrolysis, a new urea hydrolysis equation for MICP loess solidification was obtained. A revised theoretical model for loess solidification is proposed. In addition to the biomass distribution, the contents and distribution of calcium carbonate, and the porosity of solidified loess were calculated using the proposed model. The results are consistent with the results measured during loess solidification tests, demonstrating the feasibility and practicability of the proposed model. This revised theoretical model lays a solid foundation for the solidification of loess and preventing loess from collapsing.
AB - Similar to sand solidification with microbially induced carbonate precipitation (MICP), the MICP technique can also be used to bond loess particles and improve the collapsibility of loess. However, existing theoretical models related to MICP sand solidification cannot be used to guide the application of loess solidification. Based on the properties of loess, the present study revised the transport model of biomass. The revised biomass transport model enabled the calculation of the biomass distribution. Moreover, considering the effects of nutrients in the cementation solution and the ions of inorganic salts contained in loess on urea hydrolysis, a new urea hydrolysis equation for MICP loess solidification was obtained. A revised theoretical model for loess solidification is proposed. In addition to the biomass distribution, the contents and distribution of calcium carbonate, and the porosity of solidified loess were calculated using the proposed model. The results are consistent with the results measured during loess solidification tests, demonstrating the feasibility and practicability of the proposed model. This revised theoretical model lays a solid foundation for the solidification of loess and preventing loess from collapsing.
KW - Calcium carbonate
KW - Loess solidification
KW - Microbially induced carbonate precipitation (MICP)
KW - Porous media
KW - Revised model
UR - http://www.scopus.com/inward/record.url?scp=85150948885&partnerID=8YFLogxK
U2 - 10.1061/JGGEFK.GTENG-10309
DO - 10.1061/JGGEFK.GTENG-10309
M3 - Journal article
AN - SCOPUS:85150948885
SN - 1090-0241
VL - 149
JO - Journal of Geotechnical and Geoenvironmental Engineering
JF - Journal of Geotechnical and Geoenvironmental Engineering
IS - 6
M1 - 04023031
ER -