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.

水力冲刷是景观演化的一个基本过程，水流从破碎的岩体中冲刷出大块的岩块。这一过程也会影响与水相互作用的工程结构，如水坝和桥梁，并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使用能力。本研究使用联合水槽和数值模拟来建立对水力采摘机制的更全面的理解，这将为基础设施的设计和修复提供信息。这种对失败控制模式的机制理解将使我们有可能确定最有效的设计或补救策略，也可以纳入景观演变模型。探索采摘的多尺度和渐进性质的系统手段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，作为这项研究的一部分开发的软件将以开源的方式发布，供研究人员和工程师使用。实验数据集也将存储在一个公共存储库中，以便更广泛地获得和访问。要准确预测采出的可能性，需要了解断裂岩体或工程材料的不同特性如何与流过、围绕和穿过它的流体的流动特性相互作用。目前还不完全清楚这些特性的变化是如何影响采摘的，也没有考虑到目前的冲刷评估方法，即使潜在的叠加效应可以降低冲刷的阈值。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，以便对采摘过程有更全面的了解。这将通过配对实验和数值方法来实现，该方法应用缩放水槽实验和耦合离散元和晶格玻尔兹曼方法数值模拟。这些能力将通过限制需要在基于物理的模型中做出的简化假设的数量和程度，使冲刷评估方法摆脱经验主义。从这项研究中获得的对潜在力学的理解，以及对多块流体系统最关键特征的识别，将为进一步研究应用于工程结构的稳定性和修复，以及对自然河道中基岩侵蚀速率的描述提供信息。该奖项反映了美国国家科学基金会的法定使命，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，被认为值得支持。