Multi-scale modeling of coupled multiphysics processes in geomaterials: Theoretical and experimental study

岩土材料中耦合多物理过程的多尺度建模：理论和实验研究

• 批准号: RGPIN-2016-05205
• 负责人: Guo, Peijun
• 金额: $ 2.62万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=652687
• 关键词: Multi; scale; modeling; coupled; multiphysics

Multiphysics processes and different levels of mutual coupling have been observed in various aspects of geotechnical and environmental engineering and of energy production, such as waste disposal (including nuclear waste) and soil pollution problems where heat effects add to the complexity of multi-phase couplings, hydro-mechanical interactions during hydraulic fracture of shale or other tight rocks in oil and gas industry and slope failure induced by infiltration of water into the ground surface. It is not sufficient to solely carry out analysis on each physical process separately for these complicated engineering problems. Instead, it is crucial to consider their mutual coupling in the analysis. These processes cover different scales, from particle size to much larger engineering scales. Therefore, it is required to study the performance of relevant infrastructures by considering various coupled multiphysics processes on multi-scales.*** The main objectives of the research are to understand the coupled effects of different physics processes (particularly fluid flow and stress-induced deformation) on underlying mechanisms of instability and degradation in geomaterials. Thereafter, a mathematical framework will be developed across scales to describe material behavior, with micromechanical aspects of soil behaviour being properly taken into account.*** The research consists of theoretical analysis, laboratory tests and numerical modelling of soil behaviour involving mechanical, hydraulic and environmental processes. The experimental study includes the characterization of internal structure on particle level using X-ray micro-CT digital image analysis and laboratory tests on engineering soil properties to understand the effect of different processes, such as stress-induced deformation, internal structure change and water flow. The mathematical work will develop a new multi-scale, multi-phase formulation that penetrates down to details of grain activity at the particle-scale, and back to the macro-scale through a micromechanical analysis and homogenization. The mathematical framework, after being implemented into a computer modelling code and validated against benchmark problems, will be used to analyze a variety of practical problems such hydraulic fracture of rock. *** The proposed research is unique in that it accounts for the effect of coupled hydro-mechanical-environmental processes on the behaviour of geomaterials. The developed multi-scale modeling methods employ information at the grain level for larger scale simulations for difficult problems, such as seasonal deterioration of highway pavements, hydraulic fracture of rock, as well as for the impact of climate change on geotechnical infrastructures. Six graduate students will be trained in the proposed research. Clearly, each would become a highly trained researcher at the end of the project.********

在岩土工程、环境工程和能源生产（如废物处理）的各个方面都观察到了多物理过程和不同程度的相互耦合（包括核废料）和土壤污染问题，其中热效应增加了多相耦合的复杂性，水，氢油气工业中页岩或其他致密岩石水力压裂过程中的力学相互作用以及水渗透引起的边坡破坏进入地面。对于这些复杂的工程问题，仅仅对每一个物理过程分别进行分析是不够的。相反，在分析中考虑它们的相互耦合至关重要。这些过程涵盖不同的尺度，从颗粒大小到更大的工程尺度。因此，需要在多尺度上考虑各种耦合多物理场过程，研究相关基础设施的性能。 该研究的主要目标是了解不同物理过程（特别是流体流动和应力引起的变形）对地质材料不稳定和退化的潜在机制的耦合效应。此后，将开发一个跨尺度的数学框架来描述材料行为，并适当考虑土壤行为的微观力学方面。 该研究包括理论分析，实验室测试和涉及机械，水力和环境过程的土壤行为的数值模拟。试验研究包括利用X射线显微CT数字图像分析技术在颗粒水平上表征内部结构，以及对工程土性质进行室内试验，以了解不同过程（如应力诱导变形、内部结构变化和水流）的影响。数学工作将开发一种新的多尺度，多相配方，渗透到颗粒尺度的颗粒活动的细节，并通过微观力学分析和均匀化回到宏观尺度。数学框架，实施到计算机建模代码和验证后，对基准问题，将被用来分析各种实际问题，如水力压裂岩石。 *** 拟议的研究是独一无二的，因为它占耦合的流体力学环境过程的影响，地质材料的行为。开发的多尺度建模方法采用颗粒级的信息进行大尺度模拟，以解决困难的问题，如公路路面的季节性恶化，岩石的水力压裂，以及气候变化对岩土基础设施的影响。六名研究生将接受拟议研究的培训。显然，每个人在项目结束时都会成为训练有素的研究人员。