CAREER: Multiphysics Damage and Healing of Rocks for Performance Enhancement of Geo-Storage Systems - A Bottom-Up Research and Education Approach

职业：岩石的多物理损伤和修复以增强地质存储系统的性能 - 自下而上的研究和教育方法

基本信息

批准号：
1552368
负责人：
Chloe Arson
金额：
$ 50万
依托单位：
Georgia Tech Research Corporation
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-01-01 至 2020-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1552368&HistoricalAwards=false
关键词：
CAREER Multiphysics Damage Healing Rocks

项目摘要

This Faculty Early Career Development (CAREER) Program grant will enhance engineers' understanding of the formation and healing of rock fractures as it pertains to underground energy and waste storage systems, while providing undergraduate students from a diverse background with both research and international collaboration experiences. The safe storage of energy or waste products in underground rock formations relies on an understanding of the fractures that exist within the rock mass, and the fluid flow through the fracture system. Currently, engineers have an incomplete understanding of how microscopic theories of fracture formation and the healing of fractures can be used to develop models of rock mass behavior. Therefore, the objectives of this CAREER award are to: understand and predict changes in rock fractures; develop numerical models of fracture networks; formulate and assess innovative models of fracture damage and healing; and interpret rock deformation and fluid flow instabilities resulting from fracture damage and healing. In addition to preventing subsidence, borehole instabilities and contaminant leakage, the proposed models will be applicable for optimizing containment and shielding properties of geomaterials and assessing the environmental impact of energy geotechnologies. Research and education activities will be integrated to train undergraduate students in design and research, engage graduate students in mentoring and public deliberation, and foster long-term international collaborations. The PI will collaborate with a number of educational and outreach programs at Georgia Tech in order to assess the effectiveness of the activities and improve the participation of students, especially those from under-represented groups.The specific research goal of this CAREER plan is to understand and predict the evolution of rock microstructural and poromechanical behavior upon chemo-mechanical damage and healing. Geological storage in salt and carbonates is used as an illustrative problem for investigating the following fundamental scientific questions: why do pores and cracks heal? how long do mechanical and hydraulic recovery take? how much energy does healing require? A major expected outcome of this project is a new continuum damage and healing theoretical framework for rock mechanics, which uses a minimal set of explanatory dissipation variables defined as moments of probability of microstructure descriptors. Original contributions include: a theory to predict pore geometry evolution upon multi-physics damage and healing processes; creative mathematical models to describe pore network topology with geometric variables that control damage and healing; fundamental relationships between pore-scale healing time and macroscopic mechanical recovery time - a step forward to bridge poromechanics and damage mechanics; innovative computational methods to predict mechanical instabilities and percolation thresholds upon damage and healing, verified in collaboration with leading experimentalists; and realistic multi-physics simulations of geological storage, in collaboration with industry partners. The rigorous integration of topology, thermodynamics, poromechanics and continuum mechanics will transform the theory of damage and healing mechanics and provide a framework to interpret rock stress path history from topology descriptors. Research findings will be useful to recommend the conditions of moisture and temperature necessary to minimize damage and/or enhance healing in rocks and to design safe and sustainable geological storage systems. The education goal of this CAREER plan is to engage an international and cross-disciplinary community of undergraduate and graduate students in energy geotechnology research and engineering. Research, education and outreach activities will be integrated by: collaborating with geoscientists to train geosystems students on how to design and conduct rock mechanics experiments; making students' thinking visible in undergraduate classes to implement solution design strategies; engaging graduate students in public deliberations on energy geotechnology; supervising a Vertically Integrated Laboratory that will build a trans-generational, cross-disciplinary and international scholar network, improve undergraduate students' learning outcomes and inspire students in geomechanics; and creating a sustainable student exchange program between Georgia Tech and top European institutions including Ecole des Ponts Paris Tech (France).

这项教师的早期职业发展（职业）计划赠款将增强工程师对岩石断裂的形成和康复的理解，因为它与地下能源和废物存储系统有关，同时为来自不同背景的本科生提供研究和国际协作经验。能量或废物在地下岩层中的安全存储取决于对岩石质量内部裂缝的理解，以及流经裂缝系统的流体流动。目前，工程师对裂缝形成的微观理论和裂缝的愈合如何用于开发岩体行为模型。因此，该职业奖的目标是：理解和预测岩石裂缝的变化；开发断裂网络的数值模型；制定和评估断裂损伤和愈合的创新模型；并解释因断裂损伤和愈合而导致的岩石变形和流体流动不稳定性。除了预防沉降，井眼不稳定性和污染物泄漏外，提出的模型还适用于优化地貌的遏制和屏蔽特性，并评估能量地球技术的环境影响。研究和教育活动将集成，以培训本科生的设计和研究，让研究生参与指导和公众审议，并培养长期的国际合作。 PI将与佐治亚理工学院的许多教育和外展计划合作，以评估活动的有效性并改善学生的参与，尤其是来自代表性不足的人群的学生的参与。该职业计划的具体研究目标是了解和预测岩石微观结构和门将行为对化学机械损伤和康复的进化。盐和碳酸盐中的地质存储被用作研究以下基本科学问题的说明性问题：为什么毛孔和裂缝会愈合？机械和液压恢复需要多长时间？治愈需要多少能量？该项目的一个主要预期结果是岩石力学的新连续性损害和康复理论框架，该框架使用了一组最小的解释性耗散变量，定义为微观结构描述概率的时刻。最初的贡献包括：一种预测多物理损伤和康复过程中孔几何发展的理论；用几何变量来控制损坏和康复的几何变量来描述孔网络拓扑的创造性数学模型；孔尺度的愈合时间与宏观机械恢复时间之间的基本关系 - 向前迈向桥梁机械和损害力学的一步；与领先的实验家合作验证的创新计算方法，以预测损伤和康复后的机械不稳定性和渗透阈值；以及与行业合作伙伴合作的地质存储的现实多物理模拟。拓扑，热力学，门能和连续机械的严格整合将改变损害和康复力学的理论，并提供一个框架来解释拓扑描述符的岩石应力路径历史记录。研究发现将很有用，可以推荐最大程度地减少损害和/或增强岩石愈合并设计安全可持续的地质存储系统的水分和温度条件。该职业计划的教育目标是与能源岩土研究与工程学的本科生和研究生的国际和跨学科社区参与。研究，教育和外展活动将融合：与地球科学家合作，培训地球系统学生如何设计和进行摇滚力学实验；使学生在本科课程中可见的思想以实施解决方案设计策略；让研究生参与有关能源地质技术的公众审议；监督垂直整合的实验室，该实验室将建立跨国，跨学科和国际学者网络，改善本科生的学习成果并激发地质力学学生的灵感；并在佐治亚理工学院和包括Ecole des Ponts Paris Tech（法国）在内的顶级欧洲机构之间建立可持续的学生交流计划。