Factors affecting the effectiveness of biocementation of soil

Abstract

Microbially or enzyme induced carbonate precipitation has emerged to be a new type of soil improvement method. However, it appears that the biocementation process is affected by many factors and a common understanding on the control factors on the biocement effect has not been reached. This paper attempts to identify the main factors that controlling the MICP or EICP effect through an in-depth discussion on the fundamentals of biocementation process. Similar to other cemented granular materials, biocemented soil is a structural soil composite consisting of soil skeleton and biocement force chain or biocement network. The strength and stiffness of the biocemented soil is controlled by the reinforcement effect of the biocement network on the soil skeleton or the interplay of the soil skeleton and precipitates. The contribution of the strength by soil skeleton is affected by the soil types and soil properties, while the contribution of the precipitates is through the distribution of the biocement network and the properties of the precipitates.

Keywords

Biocementation / Strength enhancement / Mechanism / Influencing factor

CRediT authorship contribution statement

Hanjiang Lai: Writing - review & editing, Writing - original draft, Funding acquisition, Data curation, Conceptualization. Xingzhi Ding: Writing - review & editing, Writing - original draft, Resources, Funding acquisition, Formal analysis, Data curation, Conceptualization. Mingjuan Cui: Writing - review & editing, Writing - original draft, Visualization, Funding acquisition, Formal analysis, Data curation, Conceptualization. Junjie Zheng: Writing - review & editing, Writing - original draft, Formal analysis, Data curation, Conceptualization. Jian Chu: Writing - review & editing, Writing - original draft, Visualization, Validation, Data curation, Conceptualization. Zhibo Chen: Writing - review & editing, Writing - original draft, Visualization, Supervision, Data curation, Conceptualization.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Mingjuan Cui is the early career editorial board member of Biogeotechnics, Junjie Zheng is the editorial board member of Biogeotechnics, and Jian Chu is the editor-in-chief for Biogeotechnics, they were not involved in the editorial review or the decision to publish this article.

Acknowledgements

The authors would like to thank the financial support by the National Natural Science Foundation of China (NSFC) (Grant Nos. 52178319, 52108307, 51708243), and the Natural Science Foundation of Fujian Province, China (Grant Nos. 2022J05020, 2022J05127).

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