Multi-scale integration simulation of microbially induced carbonate precipitation using reaction-diffusion and homogenization models
Multi-scale integration simulation of microbially induced carbonate precipitation using reaction-diffusion and homogenization models
复制标题
使用反应扩散和均质化模型对微生物诱导碳酸盐沉淀进行多尺度集成模拟
DOI：
10.1007/s10064-022-02957-9
复制
发表时间：
2022
影响因子：
4.2
通讯作者：
Matsubara Hitoshi
中科院分区：
文献类型：
--
作者：
Nishimura Ibuki;Matsubara Hitoshi
几种微生物产生各种矿物质，排放的二氧化碳比使用混凝土桩和/或水泥乳作为土壤改良材料时少。因此，微生物诱导碳酸盐沉淀（MICP）等生物介导的土壤改良技术有望成为改善土壤性质的可行选择。以前的研究已经确定了最佳的MICP条件，确定了高活性物种，分析了微观结构的变化，并预测MICP的影响，实验室实验，现场调查和数值模拟的基础上。然而，对MICP现象的详细动态行为以及MICP随时间变化与土壤力学性质之间的关系的了解仍然有限。在这项研究中，提出了一种新的数值方案，桥梁之间的差距微观尺度和宏观尺度结构的MICP涉及尿素水解反应，该计划采用反应扩散模型的MICP计算的微观尺度和桥梁方法的均匀化模型。该方法还可用于计算MICP过程中土体的力学行为。计算的碳酸钙浓度与实验结果比较吻合。此外，模拟使用均匀化方法揭示了应力集中松弛土颗粒之间的MICP反应。
Several microorganisms produce various minerals and emit less carbon dioxide than in the case when using concrete piles and/or cement milk as soil improvement materials. Therefore, bio-mediated soil improvement techniques such as microbially induced carbonate precipitation (MICP) are expected to become a feasible option to improve soil properties. Previous studies have determined the optimum MICP conditions, identified highly active species, analyzed changes in micro-structures, and predicted MICP effects based on laboratory experiments, field investigations, and numerical simulations. However, the understanding of the detailed dynamic behavior of MICP phenomena and the relationship between the time-dependent changes in MICP and the soil mechanical properties remains limited. In this study, a novel numerical scheme is proposed to bridge the gap between micro-scale and macro-scale structures in MICP involving the urea hydrolysis reaction; this scheme employs both a reaction–diffusion model for MICP calculation on the micro-scale and a homogenization model for the bridging method. The mechanical behavior of soil during MICP phenomena could also be calculated using the proposed scheme. The calculated concentrations of calcium carbonate relatively corresponded with the experimental results. Additionally, a simulation using the homogenization method revealed a stress concentration relaxation between soil particles during the MICP reaction.