CAREER: A Non-local Mathematical and Computational Paradigm for Failure in Unsaturated Soils: Integrated Research and Education through High Performance Computing

职业：非饱和土失效的非局部数学和计算范式：通过高性能计算进行综合研究和教育

• 批准号: 1944009
• 负责人: Xiaoyu Song
• 金额: $ 50万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-01 至 2025-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1944009&HistoricalAwards=false
• 关键词: CAREER; Non; local; Mathematical; Computational

This Faculty Early Career Development Program (CAREER) grant will address fundamental knowledge gaps preventing the accurate characterization of multiphysics conditions driving failure (e.g., shear bands/cracks) of unsaturated soils. Unsaturated soil mechanics plays a vital role in geohazard assessment, as well as energy, environmental, and coastal geotechnics. Advances in these fields are hindered by unsaturated soil failure mechanisms that are poorly characterized and thus difficult to predict and mitigate. Such failures involve coupled multiphysics processes and arbitrary shear bands/cracks at multiple space and time scales. With recent advances in high-performance computing (HPC), computational modeling is becoming increasingly crucial for advancing our ability to characterize, predict, and mitigate such failures. This powerful tool must be coupled with new and robust numerical methods that are designed to harness and optimize this capability. This CAREER project will develop a novel non-local mathematical and computational paradigm for modeling failure phenomena in non-isothermal unsaturated soils through HPC. The hypothesis is that material heterogeneities and environmental loads are the critical triggers for failures (shear bands/cracks) in unsaturated soils, and that the prediction of such failures can be achieved via coupling HPC with new physics-based numerical tools. The rigorous integration of unsaturated soil mechanics, interface physics, poromechanics, thermodynamics, non-local vector calculus, and HPC can potentially revolutionize our modeling techniques for multiscale, multiphysics problems. Integrated research and educational activities through HPC will foster the interest of high-school and underrepresented students in STEM educations and careers and engage graduate students in globally collaborative research and effective dissemination of scientific knowledge to a diverse audience. The cultivated diverse collaboration network, including NSF Centers, U.S. national laboratories, leading consulting firms, and top global institutions, will increase the national and global impacts of this project and has the added benefit of exposing students to a dynamic team.The research goal of this CAREER grant is to better characterize and predict failures in unsaturated soils under environmental loads. This project will (i) formulate, implement, and validate a novel multiphysics peri-poromechanics (PPM) paradigm using non-local vector calculus and basic principles of physics and mechanics, and (ii) conduct extensive computational experiments through HPC. The new knowledge generated by this project includes a fundamental mechanistic understanding of multiphysics conditions driving failures of unsaturated soils that is crucial for building sustainable and resilient civil infrastructure. A significant outcome of this project is expected to be a novel multiphysics PPM paradigm that can potentially transform mathematical and computational modeling of failures in unsaturated soils due to its physical and mathematical consistency across multiple spatial scales. Original contributions expected are: (i) A novel physically, mathematically and computationally consistent paradigm for better modeling soil multiphysics; (ii) Next-generation non-local constitutive models for unsaturated soils; (iii) A validated open-source HPC tool for predicting unsaturated soil failures; and (iv) A new mechanistic understanding of multiphysics conditions driving failures in unsaturated soils. The educational plan will challenge and prepare next-generation engineers and scientists with a diverse knowledge base by integrating fundamental principles of mathematics, physics, mechanics, and HPC. This project will implement a series of initiatives, including two course modules on key concepts in unsaturated soil failure analysis and the vital role of HPC in basic scientific research, a cloud computing app, a dedicated wiki page, and NSF SimCenter and ASCE webinars.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这一教师早期职业发展计划（CAREER）赠款将解决基本知识差距，防止多物理条件驱动失败的准确表征（例如，剪切带/裂缝）。 非饱和土力学在地质灾害评估以及能源、环境和海岸岩土工程中起着至关重要的作用。这些领域的进展受到非饱和土壤破坏机制的阻碍，这些机制的特点很差，因此难以预测和减轻。这种故障涉及耦合多物理过程和任意剪切带/裂纹在多个空间和时间尺度。随着高性能计算（HPC）的最新进展，计算建模对于提高我们表征，预测和减轻此类故障的能力变得越来越重要。这个强大的工具必须与新的和强大的数值方法相结合，这些方法旨在利用和优化这种能力。这个CAREER项目将开发一种新的非局部数学和计算范例，用于通过HPC模拟非等温非饱和土壤中的破坏现象。该假设是，材料的非均匀性和环境载荷是非饱和土壤中的故障（剪切带/裂缝）的关键触发器，这种故障的预测可以通过耦合HPC与新的基于物理的数值工具来实现。非饱和土力学，界面物理学，孔隙力学，热力学，非局部矢量微积分和HPC的严格整合可能会彻底改变我们的多尺度，多物理问题的建模技术。通过HPC进行的综合研究和教育活动将培养高中和代表性不足的学生对STEM教育和职业的兴趣，并使研究生参与全球合作研究，并向不同的受众有效传播科学知识。培养多样化的合作网络，包括NSF中心，美国国家实验室，领先的咨询公司，和顶级的全球机构，将增加这个项目的国家和全球影响力，并有一个充满活力的团队接触学生的额外好处。这个CAREER赠款的研究目标是更好地描述和预测环境负荷下的非饱和土壤故障。该项目将（i）使用非局部矢量微积分和物理学和力学的基本原理制定，实施和验证一种新的多物理场围孔力学（PPM）范例，以及（ii）通过HPC进行广泛的计算实验。该项目产生的新知识包括对驱动非饱和土壤失效的多物理条件的基本机械理解，这对于建设可持续和有弹性的民用基础设施至关重要。该项目的一个重要成果预计将是一种新的多物理场PPM范式，由于其在多个空间尺度上的物理和数学一致性，它可能会改变非饱和土壤中故障的数学和计算建模。预期的原始贡献是：（i）一种新的物理，数学和计算一致的范例，用于更好地模拟土壤多物理;（ii）下一代非局部非饱和土壤本构模型;（iii）一个有效的开源HPC工具，用于预测非饱和土壤故障;（iv）对非饱和土壤中驱动故障的多物理条件的新的机械理解。该教育计划将通过整合数学，物理，力学和HPC的基本原理，挑战和准备下一代工程师和科学家的多样化知识基础。该项目将实施一系列举措，包括关于非饱和土壤破坏分析关键概念的两个课程模块和HPC在基础科研中的重要作用，云计算应用程序，专用wiki页面以及NSF SimCenter和ASCE网络研讨会。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估而被认为值得支持。

项目成果

Dynamic Localized Failure of Soils via Nonlocal Poromechanics Model: A Case Study of the Lower San Fernando Dam Failure

通过非局部孔隙力学模型进行土壤动态局部破坏：圣费尔南多下游大坝溃决案例研究

• DOI: 10.1061/9780784483701.002
• 发表时间: 2021
• 期刊: ASCE Geo-Extreme 2021
• 作者: Menon, Shashank;Song, Xiaoyu
• 通讯作者: Song, Xiaoyu

Micro-polar periporomechanics for shear bands and cracks in porous media under dynamic loads

动态载荷下多孔介质剪切带和裂缝的微极性周孔隙力学

• 发表时间: 2023
• 期刊: Proceedings 10th NUMGE 2023 10th European Conference on Numerical Methods in Geotechnical Engineering
• 作者: X. Song, H. Pashazad

Nanoscale soil-water retention mechanism of unsaturated clay via MD and machine learning

基于 MD 和机器学习的非饱和粘土纳米级土壤保水机制

• DOI: 10.1016/j.compgeo.2023.105678
• 发表时间: 2023
• 期刊: Computers and Geotechnics
• 影响因子: 5.3
• 作者: Zhang, Zhe;Song, Xiaoyu
• 通讯作者: Song, Xiaoyu

Nanoscale crack propagation in clay with water adsorption through reactive MD modeling

• DOI: 10.1002/nag.3507
• 发表时间: 2022-09
• 期刊: International Journal for Numerical and Analytical Methods in Geomechanics
• 影响因子: 4
• 作者: Zhe Zhang;Xiaoyu Song

Nonequilibrium molecular dynamics (NEMD) modeling of nanoscale hydrodynamics of clay‐water system at elevated temperature

• DOI: 10.1002/nag.3325
• 发表时间: 2021-12
• 期刊: International Journal for Numerical and Analytical Methods in Geomechanics
• 影响因子: 4
• 作者: Zhe Zhang;Xiaoyu Song