Collaborative Research: Multi-Block System Response to Hydraulic Loads in Rock Scour

合作研究：多块系统对岩石冲刷水力载荷的响应

• 批准号: 2218551
• 负责人: Michael Gardner
• 金额: $ 41.95万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-10-01 至 2023-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2218551&HistoricalAwards=false
• 关键词: Collaborative; Research; Multi; Block; System

Scour by hydraulic plucking is a fundamental process in landscape evolution where large, competent rock blocks are eroded from a fractured rock mass by flowing water. This process also affects engineered structures interacting with water, such as dams and bridges, and often leads to operational and safety concerns since erosion of large volumes of material can compromise structure foundations and serviceability. This research uses joint flume and numerical modeling to establish a more comprehensive understanding of the mechanics of hydraulic plucking, which will inform infrastructure design and remediation. This mechanistic understanding of the governing modes of failure will make it possible to identify the most efficient design or remediation strategy, and can also be incorporated into landscape evolution models. The systematic means by which the multi-scale and progressive nature of plucking is explored will provide insights into key parameters that should be considered in real-time hazard analysis and landscape evolution. Additionally, software developed as part of this research will be released open-source to make it available to researchers and engineers. The experimental data set will also be stored in a public repository to be more broadly available and accessible.Accurately predicting the likelihood of plucking requires an understanding of how different properties of the fractured rock mass or engineered material interplay with flow characteristics of the fluid flowing over, around, and through it. It is not fully understood how variation in these properties influence plucking, nor is it considered in present scour evaluation methods, even though the potential stacking of effects could lower the threshold for scour. This research will develop capabilities that assess the interaction between different material and flow properties in order to develop a more comprehensive understanding of the plucking process. This will be achieved through a paired experimental and numerical approach that applies scaled flume experiments and coupled Discrete Element and Lattice Boltzmann Method numerical simulations. These capabilities will enable scour assessment methods that move away from empiricism by limiting the number and extent of simplifying assumptions that need to be made in physics-based models. The understanding of the underlying mechanics gained from this research and identification of the most critical features of the multi block-fluid system will inform further research applied to stability and remediation of engineered structures, as well as descriptions of rates of bedrock erosion in natural channels.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.

水力采摘冲刷是景观演化的一个基本过程，其中大的、有能力的岩块被流水从裂隙岩体中侵蚀出来。这一过程还会影响与水相互作用的工程结构，例如水坝和桥梁，并且经常导致操作和安全问题，因为大量材料的侵蚀会损害结构基础和可用性。这项研究使用联合水槽和数值建模来更全面地了解水力拔除的力学原理，这将为基础设施设计和修复提供信息。这种对失效控制模式的机械理解将使确定最有效的设计或修复策略成为可能，并且还可以纳入景观演化模型中。探索采伐的多尺度和渐进性质的系统方法将为实时危害分析和景观演变中应考虑的关键参数提供见解。此外，作为本研究的一部分开发的软件将开源发布，以供研究人员和工程师使用。实验数据集还将存储在公共存储库中，以便更广泛地使用和访问。准确预测采摘的可能性需要了解裂隙岩体或工程材料的不同特性如何与流过、周围和流经其的流体的流动特性相互作用。目前尚未完全了解这些特性的变化如何影响采摘，目前的冲刷评估方法也没有考虑这一点，尽管潜在的叠加效应可能会降低冲刷的阈值。这项研究将开发评估不同材料和流动特性之间相互作用的能力，以便更全面地了解拔毛过程。这将通过配对的实验和数值方法来实现，该方法应用比例水槽实验以及耦合离散元和格子玻尔兹曼方法数值模拟。这些功能将使冲刷评估方法能够通过限制基于物理的模型中需要做出的简化假设的数量和程度来摆脱经验主义。从这项研究中获得的对基础力学的理解以及对多块流体系统最关键特征的识别将为工程结构稳定性和修复的进一步研究以及自然河道中基岩侵蚀速率的描述提供信息。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。