Experimental Study of the Acoustic Fluidization Mechanism for Large Landslides and Earthquakes

大型滑坡和地震的声流化机理实验研究

• 批准号: 8916005
• 负责人: H. Melosh
• 金额: $ 4.02万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-01 至 1992-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916005&HistoricalAwards=false
• 关键词: Experimental; Study; Acoustic; Fluidization; Mechanism

Large landslides occur after an energetic trigger event, such as earthquakes and volcanic eruptions, which activates a mechanism called "acoustic fluidization", in accordance with a theory developed by the principal investigator. He has demonstrated that acoustic energy does facilitate the flow of rock debris in some preliminary experiments. Still, one of the major areas of uncertainty in this mechanism is the value of certain important material parameters that describe the production, scattering, and ultimately the loss of vibrational (acoustic) energy in a mass of lose rock debris. An experimental program to evaluate these parameters in the laboratory will be undertaken in which the stress-strain rate relation in a vibrating mass of debris will be measured, the physics of wave propagation and scattering in the debris will be studied, and the rate at which energy is lost by internal dissipation and gained during shearing of the debris mass will be estimated. This work will provide a better understanding of large-scale gravitational land failures.

根据主要研究者开发的理论，在高能触发事件（例如地震和火山喷发）之后发生了大型滑坡。 他已经证明，在某些初步实验中，声能确实有助于岩石碎片的流动。 尽管如此，这种机制中不确定性的主要领域之一是某些重要的材料参数的值，这些参数描述了大量损失的岩石碎屑中振动（声学）能量的丧失。 将进行一个评估实验室中这些参数的实验程序，其中将测量振动质量的应力 - 应变速率关系，研究碎屑中的波传播和散射的物理学，并且在脱毛质量估计的脱毛质量期间因内部消散而损失的能量损失了能量。 这项工作将更好地了解大规模的重力土地失败。