The Development of MICP Simulation Technique Based on Reaction Diffusion System
The Development of MICP Simulation Technique Based on Reaction Diffusion System
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DOI：
10.2472/jsms.71.59
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Ibuki Nishimura;Hitoshi Matubara
中科院分区：
文献类型：
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作者：
Ibuki Nishimura;Hitoshi Matubara
Ibuki NISHIMURA* 和 Hitoshi MATUBARA** 基于反应扩散系统开发 MICP 模拟技术 被称为微生物诱导碳酸盐沉淀 (MICP) 的土壤改良技术被认为比使用桩或水泥浆的传统技术更加环保。土壤颗粒通过在颗粒上或孔隙中沉淀碳酸钙来结合，具体取决于微生物活动。尽管已经通过化学建模对活性键和非活性键等结合结构进行了数值模拟，但尚未进行考虑微生物生长的碳酸盐沉淀的模拟。此外，空间降水模式与机械性能改善之间的关系仍然不明确。在这项研究中，提出了一种处理微生物生长的新型 MICP 模拟方案，并讨论了碳酸盐沉淀对 MICP 处理材料机械性能的影响。在该方案中，反应扩散系统和均质化方法分别用于微尺度细菌生长和多尺度应力和应变分析。 10.3小时时碳酸钙沉淀结果为4.5μmol/mm3，略高于实验数据。此外，均质化模拟表明，土壤稳定可归因于一种新型骨架结构的形成，该骨架结构包括土壤颗粒和填充碳酸钙的土壤孔隙。
The Development of MICP Simulation Technique Based on Reaction Diffusion System by Ibuki NISHIMURA* and Hitoshi MATUBARA** The soil improvement technique called as microbially induced carbonate precipitation (MICP) is recognized to be more environmentally friendly than traditional techniques using piles or cement milk. The soil particles bind by precipitating calcium carbonate on particles or in pores, depending on microbial activity. Although the binding structures such as active and inactive bonds have been numerically simulated from chemical-based modelling, the simulation of carbonate precipitation taking into account microbial growth has not been carried out. In addition, the relationship between the spatial precipitation pattern and improvement of mechanical properties remains ambiguous. In this study, a novel MICP simulation scheme dealing with microbial growth is proposed, and the impact of carbonate precipitation on the mechanical properties of the MICP-treated materials is discussed. In this scheme, a reaction-diffusion system and a homogenization method are used for microscale bacterial growth and for multiscale stress and strain analysis, respectively. The results of the calcium carbonate precipitation were 4.5 μmol/mm3 at 10.3 hour, which is slightly higher than the experimental data. Furthermore, the homogenization simulations indicated that soil stabilization could be attributed to the formation of a novel skeleton structure comprising soil particles and calcium carbonate-filled soil pores.