Development of a Coupled BCHM-Model for Numerical Investigations of MICP treatment of Soil

开发用于 MICP 土壤处理数值研究的耦合 BCHM 模型

• 批准号: 428863833
• 负责人: Professor Dr.-Ing. Udo Nackenhorst
• 金额: --
• 依托单位: Institut für Baumechanik und Numerische Mechanik (IBNM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/428863833?language=en
• 关键词: Development; Coupled; BCHM; Model; Numerical

According to some recent research, microbially induced calcite precipitation (MICP) can obviously change soil properties in term of increase of mechanical stiffness and reduction of permeability. Therefore it provides a potential alternative environmental friendly solution to a wide range of engineering problems e. g. reinforcement of the soft underground, soil erosion control, seismic control, remediation for nuclides and heavy metal contamination. Since a large area in MICP especially the coupled bio-chemo-hydro-mechanical (BCHM) processes are unexplored, to date applying MICP to improve the soil properties can only be demonstrated in the experiment. Recently many experimental investigations have been conducted on MICP in soil. However as an essential tool for the analysis of the coupled BCHM issues in porous media the numerical framework for MICP is still at its early stage. Especially, research work with regard to the mechanical constitutive model on MICP and numerical model dealing with the mechanical related coupling effects is rare. Although the experimental analysis on the mechanical behaviour of the MICP treated soil have provided sufficient database for the development of the mechanical model for MICP treated sand.Considering the current research state of MICP the aim of this project is to investigate the mechanical constitutive behaviour of MICP treated sand and develop of a fully coupled BCHM model and herewith extend scientific basis for the MICP application. The specified objectives include: 1) to develop the mechanical constitutive model; 2) to extend our current BCH model to a fully coupled BCHM model 3) to develop a robust and computational efficient solution strategy for coupled problem 4) to calibrate and validate numerical model based on experimental data; 4) to analyse the sensitivity of model parameters.It is expected that through this proposed research the understanding of the coupled BCHM processes in MICP can be improved, the long-time and MICP behaviour in different scales can be reasonably predicted, the related future research area can be identified. Besides, the concept of coupled model and the solution strategy are expected to be adopted and applied in the modelling framework of further coupled issues in porous media.

根据最近的一些研究，微生物诱导的方解石沉淀（MICP）显然可以在机械刚度增加和渗透性降低的情况下改变土壤特性。因此，它为各种工程问题提供了潜在的替代环境友好解决方案e。 g。柔软的地下，土壤侵蚀控制，地震控制，核素的修复和重金属污染的增强。由于MICP中的大面积尤其是耦合的生物化学 - 氢机械（BCHM）过程，因此尚未探索，迄今为止，只能在实验中证明使用MICP来改善土壤特性。最近，在土壤中的MICP上进行了许多实验研究。但是，作为分析多孔媒体中耦合BCHM问题的必不可少的工具，MICP的数值框架仍处于早期阶段。特别是，关于MICP的机械组成模型和涉及机械相关耦合效果的数值模型的研究工作很少。尽管对MICP处理过的土壤机械行为的实验分析为MICP处理的沙子的机械模型提供了足够的数据库。考虑到MICP的当前研究状态，该项目的目的是研究MICP处理的机械构成行为，并研究了BCHM模型的完全辅助BCHM模型和WERWITH扩展Micp Scientific Complastical scipsic sciptic scientific oppersip。指定的目标包括：1）开发机械本构模型； 2）将当前的BCH模型扩展到完全耦合的BCHM模型3）以制定耦合问题的强大和计算有效的解决方案策略4）基于实验数据校准和验证数值模型； 4）分析模型参数的灵敏度。可以预期，可以改善对MICP耦合BCHM过程的理解，可以合理地预测不同尺度的长期和MICP行为，可以确定相关的未来研究领域。此外，预计耦合模型和解决方案策略的概念将被采用和应用于多孔媒体的进一步耦合问题的建模框架。