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).

该学院的早期职业发展（职业）计划拨款将增强工程师对与地下能源和废物储存系统有关的岩石裂缝的形成和愈合的理解，同时为来自不同背景的本科生提供研究和国际合作经验。地下岩层中能量或废物的安全储存依赖于对岩体内存在的裂缝以及流经裂缝系统的流体的了解。目前，工程师们对于如何使用裂缝形成和裂缝愈合的微观理论来开发岩体行为模型还没有完全了解。因此，该职业奖的目标是：了解和预测岩石裂缝的变化；开发裂缝网络的数值模型；制定和评估骨折损伤和愈合的创新模型；并解释由裂缝损伤和愈合引起的岩石变形和流体流动不稳定性。除了防止沉降、钻孔不稳定和污染物泄漏之外，所提出的模型还将适用于优化岩土材料的遏制和屏蔽性能以及评估能源岩土技术对环境的影响。研究和教育活动将被整合起来，培训本科生进行设计和研究，让研究生参与指导和公共审议，并促进长期的国际合作。 PI 将与佐治亚理工学院的许多教育和外展项目合作，以评估活动的有效性并提高学生的参与度，特别是来自代表性不足群体的学生。该职业计划的具体研究目标是了解并预测化学机械损伤和愈合时岩石微观结构和孔隙力学行为的演变。盐和碳酸盐的地质储存被用作研究以下基本科学问题的说明性问题：为什么孔隙和裂缝会愈合？机械和液压恢复需要多长时间？治愈需要多少能量？该项目的主要预期成果是为岩石力学建立一个新的连续损伤和愈合理论框架，该框架使用定义为微观结构描述符概率矩的最小解释耗散变量集。原创贡献包括：预测多物理损伤和愈合过程中孔隙几何形状演化的理论；创造性的数学模型，用控制损伤和愈合的几何变量来描述孔隙网络拓扑；孔隙尺度愈合时间和宏观机械恢复时间之间的基本关系——在连接孔隙力学和损伤力学方面向前迈出了一步；与领先的实验学家合作验证的创新计算方法，用于预测损坏和愈合时的机械不稳定性和渗透阈值；与行业合作伙伴合作，对地质储存进行真实的多物理场模拟。拓扑学、热力学、孔隙力学和连续介质力学的严格整合将改变损伤和愈合力学的理论，并提供一个从拓扑描述符解释岩石应力路径历史的框架。研究结果将有助于推荐最小化损害和/或增强岩石愈合所需的湿度和温度条件，并有助于设计安全和可持续的地质储存系统。该职业计划的教育目标是吸引国际跨学科的本科生和研究生社区参与能源地球技术研究和工程。研究、教育和推广活动将通过以下方式整合起来：与地球科学家合作，培训地球系统学生如何设计和进行岩石力学实验；让学生的思维在本科生课堂上可见，以实施解决方案设计策略；让研究生参与有关能源地球技术的公共审议；监督一个垂直整合实验室，该实验室将建立一个跨代、跨学科的国际学者网络，提高本科生的学习成果并激发学生对地质力学的兴趣；并在佐治亚理工学院与包括巴黎理工学院（法国）在内的欧洲顶级机构之间创建可持续的学生交流计划。