Numerical Modeling of MICP Grouting in Homogeneous and Layered Heterogeneous Soils

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Guo‐Liang Ma, Zhen‐Yu Yin, Yang Xiao
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引用次数: 0

Abstract

Microbially induced carbonate precipitation (MICP) has been extensively studied through experiments as a potential solution for ground improvement. However, the investigation and optimization of the MICP grouting process remain incomplete due to various experimental limitations, such as budget constraints, equipment availability, time limit, and suitable sites. As a result, the numerical method could be a practical approach, providing a clearer understanding of the hydrological‐biological‐chemical processes involved, which could help improve the performance of MICP. In this study, a hydrological‐biological‐chemical coupling model was developed to simulate MICP grouting in both homogeneous and layered heterogeneous soils, which is often found in nature. The model effectively captures the impact of carbonate precipitation on critical aspects of the grouting process, such as flow field, bacterial adsorption, bacterial activity, and soil properties. Additionally, the Péclet and Damköhler numbers were introduced to comprehensively describe the impact of various grouting factors on the distribution of precipitates and the average CaCO3 increment in homogeneous soils. In layered heterogeneous soils, it was observed that some solutions migrate across the interface between the two soil layers, leading to an accumulation of precipitates near the interface and forming a wedge‐shaped CaCO3 increment zone in the lower‐permeability soil layer. Beyond this wedge‐shaped zone, the distribution of CaCO3 is comparable to that in homogeneous soils. These findings suggest that in layered heterogeneous soils, special attention should be given to the area adjacent to the soil interface in the less permeable layer, as the precipitate distribution in other regions mirrors that in corresponding homogeneous soils.
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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