Theoretical and Experimental Solutions for Dynamic-Hydraulic-Mechanical Processes in Geoenvironmental Engineering

地质环境工程中动态液压机械过程的理论和实验解决方案

• 批准号: RGPIN-2021-03604
• 负责人: AtefiMonfared, Kamelia
• 金额: $ 1.89万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=742635
• 关键词: Theoretical; Experimental; Solutions; Dynamic; Hydraulic

Efficient and sustainable solutions to global geoenvironmental challenges (e.g. water supply, energy generation, and geotechnical infrastructure sustainability) require a fundamental understanding of particle transport in porous media. The precipitation and entrapment of solid particles in porous media are crucial phenomena, resulting in pore blockage during the operation of geothermal, hydrocarbon, and aquifer storage and recovery (ASR) systems; impacting water quality and system competence. Conversely, cementation and pore-filling could have a positive effect on engineering properties of geomaterials; and are key mechanisms behind bio-mediated stabilization of infrastructure. The advanced understanding of physical interactions between mechanical waves and entrapped fine particles in porous media is critical for developing groundbreaking stimulation strategies to: (i) avoid/reduce/treat pore blockage; and (ii) control pore blockage to enhance field-scale bio-mediated soil stabilization. There are many uncertainties regarding fundamental mechanisms involved in particle transport, and wave propagation in saturated media. Furthermore, experimental attempts to establish the link between the aforementioned two phenomena have yielded inconsistent results; and there is currently no coupled theory to explain wave propagation in saturated media containing entrapped fines. The underlying theme of the proposed research program relates to dynamic-hydraulic-mechanical coupling in porous media, and focused on substantially closing these critical scientific gaps. We propose rigorous theoretical modeling and advanced physical experimentation, to achieve three specific goals: 1) develop new microscale theoretical models to enable accurate study of precipitation/mobilization/straining of fine particles. 2) Develop new multiscale theoretical models for wave propagation in saturated media, exploring coupled relations between wave parameters, the microstructure, and the macroscale parameters of the domain. Finally, from the new fundamental understandings, we will develop new theory to explain for the first-time physical interactions between mechanical waves and entrapped fines. 3) Conduct pilot-scale lab tests to verify the developed models, and to evaluate wave effects on formation and rupture of physical/biological clogging. Hence, this research program will add a new dimension to design of energy, water and bio-stabilization processes by integrating vibratory stimulation into injection strategies. The theoretical and experimental models obtained from this research will not only advance the scientific knowledge, but the state of practice in various geoenvironmental operations. The obtained solutions could prevent environmental disasters due to wellbore breakout and contamination of soil and water resources. Developed strategies will also enable large-scale implementation of bio-mediated stabilization techniques, which have been prevented mainly due to clogging.

有效和可持续地解决全球地质环境挑战(例如，供水、能源生产和岩土基础设施的可持续性)需要对颗粒在多孔介质中的传输有基本的了解。固体颗粒在多孔介质中的沉淀和捕获是导致地热、碳氢化合物和含水层储存和回收(ASR)系统运行过程中孔道堵塞的关键现象，影响水质和系统的能力。相反，胶结和孔隙填充可以对岩土材料的工程性质产生积极的影响，是生物中介稳定基础设施的关键机制。深入了解机械波与被困在多孔介质中的细小颗粒之间的物理相互作用对于开发开创性的刺激策略至关重要：(I)避免/减少/治疗孔隙堵塞；(Ii)控制孔隙堵塞，以增强野外规模的生物介导性土壤稳定。关于饱和介质中粒子传输和波传播的基本机制，有许多不确定因素。此外，建立上述两种现象之间联系的实验尝试产生了不一致的结果；目前还没有耦合理论来解释包含被困颗粒的饱和介质中的波传播。拟议研究计划的基本主题涉及多孔介质中的动态-液压-机械耦合，并侧重于实质性地弥合这些关键的科学空白。我们提出了严格的理论建模和先进的物理实验，以实现三个具体目标：1)开发新的微尺度理论模型，以便能够准确地研究细颗粒的沉淀/动员/应变。2)建立了饱和介质中波传播的新的多尺度理论模型，探索了波参数、微结构和区域宏观尺度参数之间的耦合关系。最后，从新的基本认识出发，我们将发展新的理论来解释第一次机械波与被困粉尘之间的物理相互作用。3)进行实验室中试试验，以验证所开发的模型，并评估波浪对物理/生物堵塞形成和破裂的影响。因此，这项研究计划将通过将振动刺激整合到注入策略中，为能源、水和生物稳定过程的设计增加一个新的维度。本研究所获得的理论模型和实验模型，不仅将促进科学认识，而且将促进各种地质环境作业的实践状态。所得到的解决方案可以防止因井壁破裂和水土资源污染而造成的环境灾害。制定的战略还将使生物中介稳定技术的大规模实施成为可能，这些技术主要是由于堵塞而被阻止的。